Provided herein is a nickel recovering method, comprising: (A-i) a reduction heat treatment process for thermally treating a first raw material containing nickel and lithium; (B) a first leaching process for leaching the heat-treated product produced by the reduction heat treatment process; (A-ii) a roasting process for thermally treating a second raw material containing nickel and sulfur; (C) a second leaching process for leaching the first leaching residue produced by the first leaching process and calcine produced by the roasting process; (D) a neutralization process for neutralizing the second leachate produced by the second leaching process; and (E) a purification process for removing impurities contained in the neutralized solution produced by the neutralization process.
A waste battery processing method includes a discharging process of discharging a waste battery, a dismantling process of dismantling the discharged waste battery into battery cell units, a shredding process of shredding the dismantled waste battery, a roasting process of roasting the shredded waste battery, a pulverizing process of pulverizing the fired waste battery, and a hydrometallurgical process of extracting and recovering metals from the pulverized waste battery.
A method for producing an aqueous manganese sulfate solution using a sulfur dioxide gas reduction leaching method includes: a raw material preparation process of preparing a manganese-containing by-product containing manganese and impurities; a pulverizing and washing process of pulverizing and washing the manganese-containing by-product; a reduction leaching process of leaching a pulverized manganese-containing by-product obtained by the pulverizing and washing process; a neutralization process of neutralizing a leached liquid produced in the reduction leaching process; a first purification process of purifying a neutralized liquid produced in the neutralization process; and a second purification process of further purifying a first-purified liquid produced in the first purification process. The reduction leaching process is performed using an inorganic acid and a sulfur dioxide gas.
A method for recovering lithium includes: preparing a lithium-containing solution containing lithium ions; exchanging the lithium ions with ions contained in a chelate resin so that the lithium ions are bonded to the chelate resin while the lithium-containing solution passes through the chelate resin; and allowing an acidic solution to pass through the chelate resin to which the lithium ions are bonded, so that the lithium ions are separated from the chelate resin.
C22B 3/38 - Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds containing phosphorus
C22B 3/42 - Treatment or purification of solutions, e.g. obtained by leaching by ion-exchange extraction
The present invention provides a nickel smelting method comprising: (A-i) a reduction heat treatment step of heat treating a first raw material containing nickel and lithium; (B) a first leaching step of leaching the heat treatment product generated in the reduction heat treatment step; (A-ii) a roasting step of heat treating a second raw material containing nickel and sulfur; (C) a second leaching step of leaching the first leached residue generated in the first leaching step and the roasted ore generated in the roasting step; (D) a neutralization step of neutralizing the second leached solution generated in the second leaching step; and (E) a purification step of removing impurities contained in the neutralized solution generated in the neutralization step.
The present invention provides a method for preparing a nickel sulfate aqueous solution, the method comprising: (A-i) a reduction heat treatment step of heat-treating a first raw material containing nickel and lithium; (B) a first leaching step of leaching a heat treatment product generated through the reduction heat treatment step; (A-ii) a roasting step of heat-treating a second raw material containing nickel and sulfur; (C) a second leaching step of leaching first leaching residues generated through the first leaching step and roasted ore generated through the roasting step; (D) a neutralization step of neutralizing a second leachate generated through the second leaching step; and (E) a solvent extraction step of purifying nickel from a neutralized solution generated through the neutralization step.
The present invention provides a nickel smelting method which includes: (A-i) a reduction heat treatment process of heat-treating a first raw material containing nickel and lithium; (B) a first leaching process of leaching a heat treatment product generated by the reduction heat treatment process; (A-ii) a roasting process of heat-treating a second raw material containing nickel and sulfur; (C) a second leaching process of leaching a first leaching residue generated by the first leaching process and a calcine generated by the roasting process; (D) a neutralization process of neutralizing a second leached solution generated by the second leaching process; (E) a purification process of removing impurities contained in a neutralized solution generated by the neutralization process; and (F) a precipitation process of performing a precipitation method for recovering nickel from a purified solution generated by the purification process, wherein nickel hydroxide is recovered by the precipitation process.
The present invention provides a nickel smelting method comprising: (A-i) a reduction heat treatment step for heat-treating a first raw material containing nickel and lithium; (B) a first leaching step for leaching a heat-treated product produced by the reduction heat treatment step; (A-ii) a roasting step for heat-treating a second raw material containing nickel and sulfur; (C) a second leaching step for leaching a first leaching residue produced by the first leaching step and a roasted ore produced by the roasting step; (D) a neutralization step for neutralizing a second leachate produced by the second leaching step; (E) a purification step for removing impurities contained in a neutralized solution produced by the neutralization step; and (F) a reduction step for performing hydrogen reduction on a purified solution produced by the purification step to recover nickel from the purified solution.
The present invention provides a nickel smelting method comprising: (A-i) a reduction heat treatment process for heat-treating a first raw material containing nickel and lithium; (B) a first leaching process for leaching the heat-treated product generated in the reduction heat treatment process; (A-ii) a first roasting process for heat-treating a second raw material containing nickel and sulfur; (C) a second leaching process for leaching the first leaching residue generated in the first leaching process and the roasted ore generated in the first roasting process; (D) a neutralization process for neutralizing the second leachate generated in the second leaching process; (E) a purification process for removing impurities contained in the post-neutralization solution generated in the neutralization process; (F) a precipitation process for performing precipitation on the post-purification solution generated in the purification process; and (G) a second roasting process for recovering nickel from the precipitated residue by roasting the precipitated residue generated in the precipitation process.
A nickel recovering method includes: (A-i) a reduction heat treatment process for thermally treating a first raw material containing nickel and lithium; (B) a first leaching process for leaching the heat-treated product produced by the reduction heat treatment process; (A-ii) a first roasting process for thermally treating a second raw material containing nickel and sulfur; (C) a second leaching process for leaching the first leaching residue produced by the first leaching process and calcine produced by the first roasting process; (D) a neutralization process for neutralizing the second leachate produced by the second leaching process; (E) a purification process for removing impurities contained in the neutralized solution produced by the neutralization process; (F) a precipitation process for performing precipitation on the purified solution produced by the purification process; and (G) a second roasting process for roasting the precipitated residue produced by the precipitation process to recover nickel.
Provided herein is a nickel recovering method, comprising: (A-i) a reduction heat treatment process for thermally treating a first raw material containing nickel and lithium; (B) a first leaching process for leaching the heat-treated product produced by the reduction heat treatment process; (A-ii) a roasting process for thermally treating a second raw material containing nickel and sulfur; (C) a second leaching process for leaching the first leaching residue produced by the first leaching process and calcine produced by the roasting process; (D) a neutralization process for neutralizing the second leachate produced by the second leaching process; (E) a purification process for removing impurities contained in the neutralized solution produced by the neutralization process; and (F) a precipitation process of performing a precipitation method to recover nickel from the purified solution produced by the purification process, and a nickel hydroxide is recovered by the precipitation process.
C22B 3/04 - Extraction of metal compounds from ores or concentrates by wet processes by leaching
C22B 3/22 - Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means
C22B 3/38 - Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds containing phosphorus
C22B 3/44 - Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
Provided herein is a nickel recovering method, comprising: (A-i) a reduction heat treatment process for thermally treating a first raw material containing nickel and lithium; (B) a first leaching process for leaching the heat-treated product produced by the reduction heat treatment process; (A-ii) a roasting process for thermally treating a second raw material containing nickel and sulfur; (C) a second leaching process for leaching the first leaching residue produced by the first leaching process and calcine produced by the roasting process; (D) a neutralization process for neutralizing the second leachate produced by the second leaching process; and (E) a purification process for removing impurities contained in the neutralized solution produced by the neutralization process.
Provided herein is a method for preparing a nickel sulfate aqueous solution, comprising: (A-i) a reduction heat treatment process for thermally treating a first raw material containing nickel and lithium; (B) a first leaching process for leaching the heat-treated product produced by the reduction heat treatment process; (A-ii) a roasting process for thermally treating a second raw material containing nickel and sulfur; (C) a second leaching process for leaching the first leaching residue produced by the first leaching process and the calcine produced by the roasting process; (D) a neutralization process for neutralizing the second leached solution produced by the second leaching process; and (E) a solvent extraction process for refining nickel in the neutralized solution produced by the neutralization process.
Provided herein is a nickel recovering method, comprising: (A-i) a reduction heat treatment process for thermally treating a first raw material containing nickel and lithium; (B) a first leaching process for leaching the heat-treated product produced by the reduction heat treatment process; (A-ii) a roasting process for thermally treating a second raw material containing nickel and sulfur; (C) a second leaching process for leaching the first leaching residue produced by the first leaching process and calcine produced by the roasting process; (D) a neutralization process for neutralizing the second leachate produced by the second leaching process; (E) a purification process for removing impurities contained in the neutralized solution produced by the neutralization process; and (F) a reduction process for performing a hydrogen reduction method on the purified solution produced by the purification process to recover nickel from the purified solution.
C22B 3/04 - Extraction of metal compounds from ores or concentrates by wet processes by leaching
C22B 3/22 - Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means
C22B 3/38 - Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds containing phosphorus
C22B 3/44 - Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
C22B 9/10 - General processes of refining or remelting of metalsApparatus for electroslag or arc remelting of metals with refining or fluxing agentsUse of materials therefor
C22B 19/30 - Obtaining zinc or zinc oxide from metallic residues or scraps
C22B 19/38 - Obtaining zinc oxide in rotary furnaces
A treatment method of a waste battery according to the present invention comprises: a discharge process for discharging waste batteries; a disassembly process for disassembling the discharged waste batteries into individual cells; a crushing process for crushing the disassembled waste batteries; a firing process for firing the waste batteries crushed into the individual cells; a grinding process for grinding the fired waste batteries; and a wet process for extracting and collecting metal from the ground waste batteries.
A method for producing manganese sulfate solution using a sulfur dioxide gas reduction leaching method according to an embodiment of the present invention comprises: a raw material preparation step for preparing a manganese-containing by-product containing manganese and impurities; a pulverizing step and a cleaning step for pulverizing and cleaning the manganese-containing by-product; a reduction leaching step for leaching the manganese-containing by-product pulverized by the pulverizing step and the cleaning step; a neutralization step for neutralizing the leached solution produced through the reduction leaching step; a first purification step for purifying the neutralized solution produced through the neutralization step; and a second purification step for further purifying the first purified solution produced through the first purification step, wherein the reduction leaching step is performed using inorganic acid and sulfur dioxide gas.
The present invention relates to a method for recovering lithium. Provided according to an embodiment of the present invention may be a method for recovering lithium, the method comprising the steps of: preparing a lithium-containing solution containing lithium ions; exchanging the lithium ions with the ions included in the chelate resin so that the lithium ions are bonded to the chelate resin while the lithium-containing solution passes through the chelate resin; and passing an acidic solution through the chelate resin to which the lithium ions are bonded so that the lithium ions are separated from the chelate resin.
C22B 3/42 - Treatment or purification of solutions, e.g. obtained by leaching by ion-exchange extraction
C22B 3/38 - Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds containing phosphorus
19.
METHOD FOR REMOVING CHLORINE IN ZINC HYDROMETALLURGY
The present disclosure provides a method for removing chlorine from a process solution in zinc hydrometallurgy, the method comprising: a step for preparing the process solution from a leaching process of leaching a zinc calcine; a step for introducing the process solution to a reactor and introducing a lead concentrate into the reactor while blowing-in oxygen; a step for solid-liquid separating of a slurry in a filtration tank, the slurry being produced in the reactor; and a step for post-processing a filtrate and a lead concentrate residue separated in the step for solid-liquid separating, wherein chlorine ions in the process solution and silver contained in the lead concentrate react with each other in the reactor to precipitate a silver chloride.
The present disclosure discloses a method for leaching copper using a pressure leaching technique, according to one embodiment, including: a raw material preparation step of preparing a raw material containing copper; and a pressure leaching step including a step of introducing the raw material into a leachate in a pressurization device and pressure-leaching copper while injecting oxygen into the pressurization device.
An automated battery disassembly system according to one embodiment includes: a workstation including a first worktable, a second worktable, a third worktable, and a discharging worktable; a discharging device; a robot device; a transfer device; and a controller electrically connected to the robot device and the transfer device. The controller is configured to control the robot device to: when a battery pack is disposed on the first worktable, separate an upper cover from the battery pack; when the battery pack is disposed on the discharging worktable, discharge the battery pack by connecting the battery pack to the discharging device; when the discharged battery pack is disposed on the second worktable, separate a battery module from the discharged battery pack; and when the battery module is disposed on the third worktable, separate battery cells from the battery module.
The present disclosure relates to a method for removing halide from halide-containing Waelz oxide. According to the method, it is possible to effectively remove halide contained in Waelz oxide, especially insoluble fluoride such as CaF2, which are difficult to remove under atmospheric pressure conditions and present as insoluble substances. Accordingly, in the process of recovering valuable metals, an additional process for adjusting the concentration of fluorine or chlorine present in the electrolyte can be omitted, and costs can be reduced.
A method for manufacturing an electrolytic copper foil according to one embodiment of the present disclosure includes: preparing an electrolyte containing copper ion and nickel ion by dissolving copper (Cu) and nickel (Ni) in sulfuric acid; and forming a copper layer by supplying an electric current to a positive plate and a negative electrode rotating drum disposed apart from each other in the electrolyte. The concentration of the nickel ion is 50 ppm to 350 ppm.
The present disclosure discloses a method for refining an iron oxide that is a by-product of a zinc smelting process, the method including a roasting process of roasting the iron oxide, a washing process of washing a roasted iron oxide cake with a washing water, and a filtering process of filtering the washed iron oxide cake, thereby providing refined iron oxide.
A method for recovering iron and valuable metals from electric arc furnace dust includes: an electric arc furnace dust treatment process of treating electric arc furnace dust to produce an intermediate product containing iron; an intermediate product treatment process of heating the intermediate product to a predetermined temperature range so that the intermediate product charged into a melting furnace is melted and reduced; and a recovery process of recovering metallic iron produced by reduction from the intermediate product and recovering valuable metals generated in the form of dust. The intermediate product treatment process includes a reducing agent charging process of charging a reducing agent containing carbon into the melting furnace to increase an amount of the metallic iron reduced from the intermediate product. The reducing agent is charged into the melting furnace at an equivalent ratio of 1.7:1 to 3.1:1 relative to iron oxide contained in the intermediate product.
A method for producing manganese(II) sulfate monohydrate includes a pulverization and washing step of pulverizing and washing a manganese-containing by-product, a leaching step of leaching the pulverized manganese-containing by-product after the pulverization and washing step to produce a leachate, a neutralization step of neutralizing the leachate produced in the leaching step, an impurity removal step of removing impurities from the leachate neutralized in the neutralization step, a solvent extraction step of recovering manganese in the form of an aqueous solution of manganese sulfate from a process liquid subjected to the impurity removal step by using a solvent extraction method, and a crystallization step of producing manganese(II) sulfate monohydrate by evaporating and concentrating the aqueous solution of manganese sulfate produced in the solvent extraction step.
A method for producing a nickel sulfate solution includes a leaching step of leaching a nickel cathode in sulfuric acid under a high temperature and a high pressure to produce a leachate, a neutralization step of neutralizing the leachate produced in the leaching step to produce a neutralized solution, and a filtration step of filtering the neutralized solution produced in the neutralization step to produce a filtrate.
A method for producing an aqueous solution containing nickel, cobalt and manganese, includes: a leaching process including a pressure-leaching process of leaching a raw material under pressure to form a leachate containing nickel, cobalt, manganese and impurities; an impurity removal process of removing the impurities from the leachate; a target substance precipitation process of precipitating a mixed hydroxide precipitate containing nickel, cobalt and manganese by introducing a neutralizing agent into a filtrate from which the impurities are removed; and a dissolution process. The pressure-leaching process includes a first-stage pressure-leaching process and a second-stage pressure-leaching process of pressure-leaching a residue of the first-stage pressure-leaching process with an acidity higher than an acidity in the first-stage pressure-leaching process. The impurity removal process includes a first-stage solvent extraction process of selectively extracting zinc from the impurities and a second-stage solvent extraction process of selectively extracting magnesium from the impurities.
C22B 3/00 - Extraction of metal compounds from ores or concentrates by wet processes
C22B 3/38 - Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds containing phosphorus
The present invention relates to a method for recovering iron and valuable metals from electric arc furnace dust. Specifically, a method for recovering iron and valuable metals from electric arc furnace dust can be provided according to one embodiment of the present invention, the method comprising: an electric arc furnace dust treatment step for treating electric arc furnace dust to produce an intermediate product containing iron; an intermediate product treatment step for heating the intermediate product at a previously set temperature range so that the intermediate product placed in a smelter is smelted and deoxidized; and a recovery step for recovering metal iron generated by deoxidation of the intermediate product and contained in the smelter in the smelted state, and recovering valuable metals produced in the form of dust in the intermediate product treatment step, wherein the intermediate product treatment step comprises a reducing agent addition step for adding a reducing agent containing carbon into the smelter so as to increase the amount of metal iron that is deoxidized from the intermediate product, and the reducing agent is added into the smelter at the equivalence ratio of 1.7-3.1 relative to the iron oxide contained in the intermediate product.
A copper sulfate electrolyte production method includes a copper melting step of producing molten copper by melting a raw material containing copper (Cu) in a melting furnace, an atomizing step of producing copper powder by spraying the molten copper with an atomizer, a leaching step of forming a copper sulfate solution by dissolving the copper powder in a leaching step input solution in a leaching reactor, a purification filtration step of removing impurities contained in the copper sulfate solution, and a conditioning step of preparing an electrolytic feed solution by mixing an electrolytic cell circulation liquid with the copper sulfate solution from which the impurities are removed in an electrolytic cell.
B22F 9/08 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
C25D 3/38 - ElectroplatingBaths therefor from solutions of copper
31.
Method for producing nickel sulfate solution for secondary battery from nickel cathode
A method for producing a nickel sulfate solution includes a leaching step of leaching a nickel cathode in sulfuric acid under a high temperature and a high pressure to produce a leachate, a neutralization step of neutralizing the leachate produced in the leaching step to produce a neutralized solution, and a filtration step of filtering the neutralized solution produced in the neutralization step to produce a filtrate.
B09B 3/80 - Destroying solid waste or transforming solid waste into something useful or harmless involving an extraction step
C22B 3/00 - Extraction of metal compounds from ores or concentrates by wet processes
H01M 4/58 - Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFySelection of substances as active materials, active masses, active liquids of polyanionic structures, e.g. phosphates, silicates or borates
H01M 10/54 - Reclaiming serviceable parts of waste accumulators
The embodiments disclosed herein relates to a method for producing a secondary battery material from black mass. The method for producing a secondary battery material from black mass according to one embodiment includes a roasting step of roasting black mass, a pre-extraction step of leaching a roasted black mass roasted in the roasting step with water to separate a lithium solution and a cake, a first evaporation concentration step of producing lithium carbonate crystals by evaporating and concentrating the lithium solution produced in the pre-extraction step, a leaching step of leaching the cake separated in the pre-extraction step, a first purification step of removing copper and aluminum from the leaching solution produced in the leaching step, a post-extraction step of neutralizing the solution prepared in the first purification step and separating the solution into a lithium solution and a cake containing Ni, Co, and Mn (NCM cake), a feeding step of feeding the lithium carbonate crystals produced in the first evaporation concentration step and the lithium solution prepared in the post-extraction step to a lithium hydroxide production step.
An automated battery disassembly system according to one embodiment includes: a workstation including a first worktable, a second worktable, a third worktable, and a discharging worktable; a discharging device; a robot device; a transfer device; and a controller electrically connected to the robot device and the transfer device. The controller is configured to control the robot device to: when a battery pack is disposed on the first worktable, separate an upper cover from the battery pack; when the battery pack is disposed on the discharging worktable, discharge the battery pack by connecting the battery pack to the discharging device; when the discharged battery pack is disposed on the second worktable, separate a battery module from the discharged battery pack; and when the battery module is disposed on the third worktable, separate battery cells from the battery module.
B23P 19/04 - Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformationTools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
34.
METHOD FOR RECOVERY OF VALUABLE METALS FROM SPENT SECONDARY BATTERIES
A method for recovering valuable metals from a spent secondary battery according to an embodiment of the present disclosure includes a pre-processing process of pre-processing the spent secondary battery, a melting process of heating the pre-processed spent secondary battery to generate a molten solution, and a recovery process of recovering the valuable metals from the molten solution. In the melting process, a chlorinating agent is added, and, in the recovery process, lithium is recovered in a form of lithium dust.
A method for processing a by-product of zinc hydrometallurgy, according to one embodiment of the present disclosure, includes a pressure leaching process of pressure leaching a lead/silver-containing by-product, which is generated in a finishing leaching process of zinc hydrometallurgy, by using an autoclave so that contents of zinc and iron contained in a leaching residue are less than 1 wt %, respectively.
A method for processing a by-product of zinc hydrometallurgy, according to one embodiment of the present disclosure, includes a pressure leaching process of pressure leaching a lead/silver-containing by-product, which is generated in a finishing leaching process of zinc hydrometallurgy, by using an autoclave so that contents of zinc and iron contained in a leaching residue are less than 1 wt%, respectively.
The present disclosure provides a method for removing chlorine from a process solution in zinc hydrometallurgy, the method comprising: a step for preparing the process solution from a leaching process of leaching a zinc calcine; a step for introducing the process solution to a reactor and introducing a lead concentrate into the reactor while blowing-in oxygen; a step for solid-liquid separating of a slurry in a filtration tank, the slurry being produced in the reactor; and a step for post-processing a filtrate and a lead concentrate residue separated in the step for solid-liquid separating, wherein chlorine ions in the process solution and silver contained in the lead concentrate react with each other in the reactor to precipitate a silver chloride.
The present disclosure relates to a method for removing halide from halide-containing Waelz oxide. According to the method, it is possible to effectively remove halide contained in Waelz oxide, especially insoluble fluoride such as CaF2, which are difficult to remove under atmospheric pressure conditions and present as insoluble substances. Accordingly, in the process of recovering valuable metals, an additional process for adjusting the concentration of fluorine or chlorine present in the electrolyte can be omitted, and costs can be reduced.
The present disclosure discloses a method for refining an iron oxide that is a by-product of a zinc smelting process, the method including a roasting process of roasting the iron oxide, a washing process of washing a roasted iron oxide cake with a washing water, and a filtering process of filtering the washed iron oxide cake, thereby providing refined iron oxide.
The present disclosure discloses a method for leaching copper using a pressure leaching technique, according to one embodiment, including: a raw material preparation step of preparing a raw material containing copper; and a pressure leaching step including a step of introducing the raw material into a leachate in a pressurization device and pressure-leaching copper while injecting oxygen into the pressurization device.
A method for producing an aqueous solution containing nickel or cobalt includes: (A) a leaching step, which includes a first atmospheric pressure heating leaching step and a second atmospheric pressure heating leaching step, in which a raw material is heated and leached under an atmospheric pressure to form a leachate solution containing nickel, cobalt, and impurities; (B) a first extraction step of separating the leachate solution into a first filtrate containing nickel and impurities and a first organic layer containing cobalt and impurities by adding a first solvent extractant to the leachate solution; (C-i) a precipitation removal step of precipitating and removing impurities including magnesium, calcium, or a mixture thereof by adding a precipitating agent to the first filtrate; and (D-i) a target material precipitation step of selectively precipitating a nickel cake containing nickel by adding a neutralizing agent to the first filtrate.
A method for producing manganese(II) sulfate monohydrate includes a pulverization and washing step of pulverizing and washing a manganese-containing by-product, a leaching step of leaching the pulverized manganese-containing by-product after the pulverization and washing step to produce a leachate, a neutralization step of neutralizing the leachate produced in the leaching step, an impurity removal step of removing impurities from the leachate neutralized in the neutralization step, a solvent extraction step of recovering manganese in the form of an aqueous solution of manganese sulfate from a process liquid subjected to the impurity removal step by using a solvent extraction method, and a crystallization step of producing manganese(II) sulfate monohydrate by evaporating and concentrating the aqueous solution of manganese sulfate produced in the solvent extraction step.
A method for recovering valuable metals from a spent secondary battery includes a pre-processing process of pre-processing the spent secondary battery, a melting process of heating the pre-processed spent secondary battery to generate a molten solution, and a recovery process of recovering the valuable metals from the molten solution. In the melting process, a chlorinating agent is added, and, in the recovery process, lithium is recovered in a form of lithium dust.
The embodiments disclosed herein relates to a method for producing a secondary battery material from black mass. The method for producing a secondary battery material from black mass according to one embodiment includes a roasting step of roasting black mass, a pre-extraction step of leaching a roasted black mass roasted in the roasting step with water to separate a lithium solution and a cake, a first evaporation concentration step of producing lithium carbonate crystals by evaporating and concentrating the lithium solution produced in the pre-extraction step, a leaching step of leaching the cake separated in the pre-extraction step, a first purification step of removing copper and aluminum from the leaching solution produced in the leaching step, a post-extraction step of neutralizing the solution prepared in the first purification step and separating the solution into a lithium solution and a cake containing Ni, Co, and Mn (NCM cake), a feeding step of feeding the lithium carbonate crystals produced in the first evaporation concentration step and the lithium solution prepared in the post-extraction step to a lithium hydroxide production step.
A method for manufacturing an electrolytic copper foil, according to one embodiment of the present invention, comprises: a copper melting step of melting, in a melting furnace, a material containing copper (Cu), thereby preparing molten copper; an atomizing step of spraying the molten copper with an atomizer, thereby preparing a copper powder; a leaching step of dissolving the copper powder in a leaching process injection solution in a leaching tank, thereby forming a copper sulfate solution; a purification and filtration step of removing the impurities contained in the copper sulfate solution; and a conditioning step of mixing, in an electrolytic bath, an electrolytic bath circulation solution and the copper sulfate solution from which the impurities have been removed, thereby preparing an electrolytic feed solution.
A copper sulfate electrolyte production method includes a copper melting step of producing molten copper by melting a raw material containing copper (Cu) in a melting furnace, an atomizing step of producing copper powder by spraying the molten copper with an atomizer, a leaching step of forming a copper sulfate solution by dissolving the copper powder in a leaching step input solution in a leaching reactor, a purification filtration step of removing impurities contained in the copper sulfate solution, and a conditioning step of preparing an electrolytic feed solution by mixing an electrolytic cell circulation liquid with the copper sulfate solution from which the impurities are removed in an electrolytic cell.
B22F 1/05 - Metallic powder characterised by the size or surface area of the particles
B22F 1/06 - Metallic powder characterised by the shape of the particles
B22F 9/08 - Making metallic powder or suspensions thereofApparatus or devices specially adapted therefor using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
The present invention provides a method for producing an aqueous solution containing nickel or cobalt, the method comprising: (A) a leaching step for leaching a raw material under atmospheric pressure to form a leachate containing nickel, cobalt, and impurities, the leaching step including a first atmospheric pressure heated leaching step and a second atmospheric pressure heated leaching step; (B) a first extraction step for introducing a first solvent extractant to the leachate to separate the leachate into a first filtrate, containing nickel and impurities, and a first organic layer, containing cobalt and impurities; (C-i) a precipitation removal step for introducing a precipitant to the first filtrate to precipitate and remove impurities including magnesium, calcium, or a mixture thereof; and (D-i) a target material precipitation step for selectively precipitating a nickel cake containing nickel by introducing a neutralizing agent to the first filtrate that has had the impurities precipitated and removed.
C22B 3/04 - Extraction of metal compounds from ores or concentrates by wet processes by leaching
C22B 3/00 - Extraction of metal compounds from ores or concentrates by wet processes
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 4/02 - Electrodes composed of, or comprising, active material
48.
METHOD FOR PRODUCING NICKEL SULFATE SOLUTION FOR SECONDARY BATTERY FROM NICKEL CATHODE
The present invention provides a method for producing a nickel sulfate solution, the method comprising: a leaching step for leaching a nickel cathode in sulfuric acid at high temperature and high pressure; a neutralization step for neutralizing a leachate from the leaching step; and a filtration step for filtering a neutralized solution obtained from the neutralization step, and thereby producing a filtrate.
Provided in one embodiment of the present disclosure is a method for leaching copper by using pressure leaching, comprising: a raw material preparation step of preparing a raw material including copper; and a pressure leaching step, which includes a step of putting the raw material into the leachate in a pressurization device, and pressure leaching copper while injecting oxygen into the pressurization device.
An automatic battery dismantling system according to one embodiment may comprise: a work unit comprising a first workbench, a second workbench, a third workbench, and a discharging workbench; a discharging device; a robotic device; a conveyance device; and a control unit electrically connected with the robotic device and the conveyance device. The control unit may be configured to control the robotic device so as to: separate a top cover from a battery pack when the battery pack is placed on the first workbench; discharge the battery pack by connecting the battery pack to the discharging device when the battery pack is placed on the discharging workbench; separate a battery module from the discharged battery pack when the discharged battery pack is placed on the second workbench; and separate battery cells from the battery module when the battery module is displaced on the third workbench.
A62C 3/16 - Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
A62C 99/00 - Subject matter not provided for in other groups of this subclass
51.
METHOD FOR PRODUCING AQUEOUS SOLUTION CONTAINING NICKEL, COBALT AND MANGANESE
The present invention provides a method for producing an aqueous solution containing nickel, cobalt, and manganese, the method comprising: a leaching step including a pressure leaching step for forming a leachate containing nickel, cobalt, manganese, and impurities by pressure leaching a raw material; an impurity removal step for removing the impurities from the leachate; a target material precipitation step for precipitating a mixed hydroxide precipitate containing nickel, cobalt, and manganese by introducing a neutralizing agent to the leachate that has had the impurities removed; and a dissolution step for dissolving the mixed hydroxide precipitate in an acid, wherein the pressure leaching step includes a first-stage pressure leaching step and a second-stage-pressure leaching step for pressure leaching residue from the first-stage pressure leaching step at a higher acidity than the first-stage pressure leaching step, and the impurity removal step includes a first-stage solvent extraction step, in which a first solvent extractant is added to selectively extract zinc from the impurities, and a second-stage solvent extraction step, in which a second solvent extractant is added to selectively extract magnesium from the impurities.
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
H01M 4/02 - Electrodes composed of, or comprising, active material
52.
METHOD FOR PROCESSING BY-PRODUCT OF HYDROMETALLURGICAL PROCESS OF ZINC WITH REDUCED CARBON EMISSION
A method for processing by-product of a hydrometallurgical process of zinc according to one embodiment of the present invention can comprise a pressure-leaching step in which lead/silver-containing by-product generated in the final leaching step of the hydrometallurgical process of zinc is pressure-leached in an autoclave so that zinc and iron content in the leached residue is each less than 1 wt%.
A method for recovery of valuable metals from spent secondary batteries, according to one embodiment of the present invention, comprises: a pretreatment step of pretreating the spent secondary batteries; a melting step of generating melt by heating the pretreated spent secondary batteries; and a recovery step of recovering valuable metals from the melt. A chlorinating agent is added in the melting step, and lithium is recovered in the form of lithium dust in the recovery step.
H01M 10/54 - Reclaiming serviceable parts of waste accumulators
C22B 9/10 - General processes of refining or remelting of metalsApparatus for electroslag or arc remelting of metals with refining or fluxing agentsUse of materials therefor
The present invention provides a method for removing chlorine in a process solution in zinc hydrometallurgy, the method comprising the steps of: preparing a process solution from a leaching process for leaching zinc calcine; adding the process solution into a reaction tank, and adding a lead concentrate into the reaction tank while blowing oxygen; subjecting a slurry formed in the reaction tank to solid-liquid separation in a filtration tank; and post-treating a filtrate and lead concentrate residue which have been separated in the solid-liquid separation step, wherein, in the reaction tank, chlorine ions in the process solution and silver contained in the lead concentrate react to precipitate silver chloride.
The present disclosure relates to a method for removing halides from waelz oxide which comprises halides. According to the present method it is possible to effectively remove halides included in waelz oxide, particularly insoluble fluorides such as CaF2 that are difficult to remove in normal pressure conditions and are insoluble, and thus it is possible to reduce costs by reducing additional steps for adjusting the concentration of fluorine or chlorine present in an electrolyte during a valuable metal recovery process.
The present invention is a method for refining iron oxide which is a by-product of a zinc smelting process, the method comprising: a firing process for firing the iron oxide; a washing process for washing an iron oxide cake with a washing liquid, after the firing; and a step for providing iron oxide by filtering the washed iron oxide cake and refining same.
A method for producing an aqueous solution containing nickel, cobalt and manganese, includes: a leaching process including a pressure-leaching process of leaching a raw material under pressure to form a leachate containing nickel, cobalt, manganese and impurities; an impurity removal process of removing the impurities from the leachate; a target substance precipitation process of precipitating a mixed hydroxide precipitate containing nickel, cobalt and manganese by introducing a neutralizing agent into a filtrate from which the impurities are removed; and a dissolution process. The pressure-leaching process includes a first-stage pressure-leaching process and a second-stage pressure-leaching process of pressure-leaching a residue of the first-stage pressure-leaching process with an acidity higher than an acidity in the first-stage pressure-leaching process. The impurity removal process includes a first-stage solvent extraction process of selectively extracting zinc from the impurities and a second-stage solvent extraction process of selectively extracting magnesium from the impurities.
C22B 3/06 - Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions
C22B 3/22 - Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means
C22B 3/26 - Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds
C22B 3/38 - Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds containing phosphorus
C22B 3/44 - Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
A method for producing manganese(?) sulfate monohydrate includes a pulverization and washing step of pulverizing and washing a manganese-containing by-product, a leaching step of leaching the pulverized manganese-containing by-product after the pulverization and washing step to produce a leachate, a neutralization step of neutralizing the leachate produced in the leaching step, an impurity removal step of removing impurities from the leachate neutralized in the neutralization step, a solvent extraction step of recovering manganese in the form of an aqueous solution of manganese sulfate from a process liquid subjected to the impurity removal step by using a solvent extraction method, and a crystallization step of producing manganese(?) sulfate monohydrate by evaporating and concentrating the aqueous solution of manganese sulfate produced in the solvent extraction step.
A method for manufacturing an electrolytic copper foil, according to one embodiment of the present invention, comprises the steps of: dissolving copper (Cu) and nickel (Ni) in sulfuric acid to prepare an electrolytic solution containing copper ions and nickel ions; and forming a copper layer by supplying current to a positive electrode plate and a negative electrode rotating drum that are disposed apart from each other in the electrolytic solution, wherein the concentration of the nickel ions is adjusted to 50 ppm to 350 ppm.
A method for controlling the properties of an electrolytic copper foil, according to one embodiment of the present invention, adds a glossiness control agent so as to adjust the glossiness of an electrolytic copper foil, and thus controls properties including tensile strength, elongation and illuminance, wherein the range of glossiness is adjusted to be 35-400 GU(60°).
A method for producing an aqueous solution containing nickel or cobalt includes: (A) a leaching step, which includes a first atmospheric pressure heating leaching step and a second atmospheric pressure heating leaching step, in which a raw material is heated and leached under an atmospheric pressure to form a leachate solution containing nickel, cobalt, and impurities; (B) a first extraction step of separating the leachate solution into a first filtrate containing nickel and impurities and a first organic layer containing cobalt and impurities by adding a first solvent extractant to the leachate solution; (C-i) a precipitation removal step of precipitating and removing impurities including magnesium, calcium, or a mixture thereof by adding a precipitating agent to the first filtrate; and (D-i) a target material precipitation step of selectively precipitating a nickel cake containing nickel by adding a neutralizing agent to the first filtrate.
C22B 3/04 - Extraction of metal compounds from ores or concentrates by wet processes by leaching
C22B 3/22 - Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means
C22B 3/38 - Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds containing phosphorus
C22B 3/44 - Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
A method for producing a nickel sulfate solution includes a leaching step of leaching a nickel cathode in sulfuric acid under a temperature of 170 degrees C to 200 degrees C and a pressure of 8.5 bar to 16 bar to produce a leachate, a neutralization step of neutralizing the leachate produced in the leaching step to produce a neutralized solution, and a filtration step of filtering the neutralized solution produced in the neutralization step to produce a filtrate, wherein a nickel concentration in the neutralized solution after the neutralization step is 120 to 140 g/L.
A method for recovering valuable metals from a spent secondary battery according to an embodiment of the present disclosure includes a pre-processing process of pre-processing the spent secondary battery, a melting process of heating the pre-processed spent secondary battery to generate a molten solution, and a recovery process of recovering the valuable metals from the molten solution. In the melting process, a chlorinating agent is added, and, in the recovery process, lithium is recovered in a form of lithium dust.
A method of controlling physical properties of an electrolytic copper foil according to one embodiment of the present invention includes: controlling the physical properties of the electrolytic copper foil including elongation, tensile strength and roughness by regulating a surface glossiness of the electrolytic copper foil through addition of a surface glossiness agent. The surface glossiness is regulated within a range of 35 to 400 GU (60°).
A method for manufacturing an electrolytic copper foil according to one embodiment of the present disclosure includes: preparing an electrolyte containing copper ion and nickel ion by dissolving copper (Cu) and nickel (Ni) in sulfuric acid; and forming a copper layer by supplying an electric current to a positive plate and a negative electrode rotating drum disposed apart from each other in the electrolyte. The concentration of the nickel ion is 50 ppm to 350 ppm.
An automated battery disassembly system according to one embodiment includes: a workstation including a first worktable, a second worktable, a third worktable, and a discharging worktable; a discharging device; a robot device; a transfer device; and a controller electrically connected to the robot device and the transfer device. The controller is configured to control the robot device to: when a battery pack is disposed on the first worktable, separate an upper cover from the battery pack; when the battery pack is disposed on the discharging worktable, discharge the battery pack by connecting the battery pack to the discharging device; when the discharged battery pack is disposed on the second worktable, separate a battery module from the discharged battery pack; and when the battery module is disposed on the third worktable, separate battery cells from the battery module.
G05B 19/418 - Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM]
H01M 10/54 - Reclaiming serviceable parts of waste accumulators
67.
METHOD FOR PRODUCING MANGANESE(II) SULFATE MONOHYDRATE FROM BY-PRODUCT OF ZINC REFINING PROCESS
A method for producing manganese(II) sulfate monohydrate, according to one embodiment of the present invention, comprises: a pulverization and cleaning process for pulverizing and cleaning a manganese-containing by-product produced in a hydrometallurgical zinc refining process; a leaching process for leaching the pulverized manganese-containing by-product after the pulverization and cleaning process; a neutralization process for neutralizing a leach solution produced as a result of the leaching process; an impurity removal process for removing impurities from the leach solution which has been neutralized by means of the neutralization process; a solvent extraction process for, by using a solvent extraction method, recovering manganese, in the form of an aqueous solution of manganese(II) sulfate, from the process solution which has gone through the impurity removal process; and a crystallization process for producing manganese(II) sulfate monohydrate by evaporating and concentrating the aqueous solution of manganese(II) sulfate produced in the solvent extraction process.
B01D 11/04 - Solvent extraction of solutions which are liquid
H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
H01M 10/0525 - Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodesLithium-ion batteries
H01M 4/02 - Electrodes composed of, or comprising, active material
68.
METHOD FOR PREPARING SECONDARY BATTERY MATERIAL FROM BLACK MASS
Embodiments of the present disclosure relate to a method for preparing a secondary battery material from black mass. The method for preparing a secondary battery material from black mass, according to one embodiment, comprises: a firing step of firing black mass; a pre-extraction step of dissolving, in water, the black mass fired in the firing step, thereby separating same into a lithium solution and a cake; a first evaporation concentration step of evaporating and concentrating the lithium solution produced in the pre-extraction step, thereby preparing a lithium carbonate crystal; a leaching step of leaching the cake separated out in the pre-extraction step; a first purification step of removing copper and aluminum from the leaching solution produced by means of the leaching step; a post-extraction step of neutralizing the solution obtained from the first purification step, thereby separating same into a lithium solution and a cake (NCM cake) comprising Ni, Co and Mn; and a transfer step of transferring, to a lithium hydroxide preparation step, the lithium carbonate crystal produced by means of the first evaporation concentration step and the lithium solution separated out by means of the post-extraction step.
The embodiments disclosed herein relates to a method for producing a secondary battery material from black mass. The method for producing a secondary battery material from black mass according to one embodiment includes a roasting step of roasting black mass, a pre-extraction step of leaching a roasted black mass roasted in the roasting step with water to separate a lithium solution and a cake, a first evaporation concentration step of producing lithium carbonate crystals by evaporating and concentrating the lithium solution produced in the pre-extraction step, a leaching step of leaching the cake separated in the pre-extraction step, a first purification step of removing copper and aluminum from the leaching solution produced in the leaching step, a post-extraction step of neutralizing the solution prepared in the first purification step and separating the solution into a lithium solution and a cake containing Ni, Co, and Mn (NCM cake), a feeding step of feeding the lithium carbonate crystals produced in the first evaporation concentration step and the lithium solution prepared in the post-extraction step to a lithium hydroxide production step.
Introduced is an economical method, using a combination of wet and dry processes, for smelting nickel from nickel concentrate, comprising the steps of: leaching, with sulfuric acid, sulfide concentrate containing nickel, so as to separate same into a leachate and a leaching cake; injecting oxygen into the leachate so as to separate same into a first filtrate and first impurities containing iron; injecting an extractant into the first filtrate so as to separate same into a second filtrate and second impurities containing cobalt; injecting sodium carbonate into the second filtrate so as to separate same into a third filtrate and a precipitate containing nickel; and calcining the precipitate, thereby preparing a nickel product.
A vertical autoclave according to an embodiment of the present disclosure is a vertical autoclave including an inlet port through which a process solution is introduced, an outlet port through which the process solution is discharged, an oxygen inlet port through which oxygen is supplied to the process solution, an agitator configured to mix the process solution, an inner wall, an acid-resistant brick layer lined on a lower portion and a side portion of the inner wall, and an acid-resistant metal layer lined on an upper portion of the inner wall. A method of removing salt from an autoclave includes raising a surface level of a solution in the autoclave from a first level to a second level such that salt in the autoclave is immersed in the solution, and maintaining the surface level of the solution at the second level. The salt is dissolved in the solution while the surface level of the solution is maintained at the second level.
A method of recovering iron from a zinc sulfate solution according to an embodiment of the present disclosure is associated with recovering iron from a zinc sulfate solution produced by a leaching process in which zinc ore is dissolved in sulfuric acid. The method comprises a conditioning process including a step of reducing a conditioning process input solution, which is the zinc sulfate solution, and an iron precipitation process for recovering iron as hematite, including a step of pressurizing and oxidizing an iron precipitation process input solution discharged from the conditioning process. The iron precipitation process is performed at a temperature ranging from 135° C. to 150° C. and a pressure ranging from 5 barg to 10 barg.
The vertical autoclave according to one embodiment of the present invention, which has an injection port via which processing liquid is injected, a discharge port via which the processing liquid is discharged, an oxygen injection port for supplying oxygen to the processing liquid, a stirrer for mixing the processing liquid, and an inner wall, comprises: an acid-resistant brick layer lining the lower and side parts of the inner wall; and an acid-resistant metal layer lining the upper part of the inner wall. In addition, the method for removing salts inside an autoclave according to one embodiment of the present invention comprises: increasing the surface level of a solution portion from a first level to a second level so that salts inside an autoclave are immersed in the solution portion; and maintaining the surface level of the solution portion at the second level, wherein the salts are dissolved into the solution portion while the surface level of the solution portion is maintained at the second level.
A method for recovering iron from a zinc sulfate solution, according to one embodiment of the present invention, comprises, in a method for recovering iron from a zinc sulfate solution to be generated from a leaching process of dissolving zinc ore in sulfuric acid, a conditioning process comprising a step of reducing a conditioning process injection solution, which is the zinc sulfate solution, and an iron precipitation process of recovering iron as hematite by comprising a step of pressure-oxidizing an iron precipitation process injection solution discharged from the conditioning process, wherein the iron precipitation process is carried out at a temperature of 135-150°C and a pressure of 5-10 barg. In addition, a method for recovering iron from a zinc sulfate solution, according to one embodiment of the present invention, comprises, in a method for recovering iron from a zinc sulfate solution to be generated from a leaching process of dissolving zinc ore in sulfuric acid, a conditioning process comprising a step of reducing a conditioning process injection solution, which is the zinc sulfate solution, and an iron precipitation process of recovering iron as hematite by comprising a step of pressure-oxidizing an iron precipitation process injection solution discharged from the conditioning process, wherein the oxidation-reduction potential of the iron precipitation process injection solution is -100 mV or less when a silver/silver chloride electrode is used as a reference electrode.
A vertical autoclave according to an embodiment of the present disclosure is a vertical autoclave including an inlet port through which a process solution is introduced, an outlet port configured through which the process solution is discharged, an oxygen inlet port through which oxygen is supplied to the process solution, an agitator configured to mix the process solution, an inner wall, an acid-resistant brick layer lined on a lower portion and a side portion of the inner wall, and an acid-resistant metal layer lined on an upper portion of the inner wall. A method of removing salt from an autoclave includes raising a surface level of a solution in the autoclave from a first level to a second level such that salt in the autoclave is immersed in the solution, and maintaining the surface level of the solution at the second level. The salt is dissolved in the solution while the surface level of the solution is maintained at the second level.
A vertical autoclave according to an embodiment of the present disclosure is a vertical autoclave including an inlet port through which a process solution is introduced, an outlet port through which the process solution is discharged, an oxygen inlet port through which oxygen is supplied to the process solution, an agitator configured to mix the process solution, an inner wall, an acid-resistant brick layer lined on a lower portion and a side portion of the inner wall, and an acid-resistant metal layer lined on an upper portion of the inner wall. A method of removing salt from an autoclave includes raising a surface level of a solution in the autoclave from a first level to a second level such that salt in the autoclave is immersed in the solution, and maintaining the surface level of the solution at the second level. The salt is dissolved in the solution while the surface level of the solution is maintained at the second level.
A method of recovering iron from a zinc sulfate solution according to an embodiment of the present disclosure is associated with recovering iron from a zinc sulfate solution produced by a leaching process in which zinc ore is dissolved in sulfuric acid. The method comprises a conditioning process including a step of reducing a conditioning process input solution, which is the zinc sulfate solution, and an iron precipitation process for recovering iron as hematite, including a step of pressurizing and oxidizing an iron precipitation process input solution discharged from the conditioning process. The iron precipitation process is performed at a temperature ranging from 135 .degree.C to 150 .degree.C and a pressure ranging from 5 barg to 10 barg. In addition, a method of recovering iron from a zinc sulfate solution according to an embodiment of the present disclosure is associated with recovering iron from a zinc sulfate solution produced by a leaching process in which zinc ore is dissolved in sulfuric acid. The method comprises a conditioning process including a step of reducing a conditioning process input solution, which is the zinc sulfate solution, and an iron precipitation process for recovering iron as hematite, including a step of pressurizing and oxidizing an iron precipitation process input solution discharged from the conditioning process. The iron precipitation process input solution has oxidation-reduction potential of -100 mV or less when a silver/silver chloride (Ag/AgCl) electrode is used as a reference electrode.
Presented is a method for economically smelting nickel from nickel laterite ores by a combination of wet and dry processes, comprising the steps of: preparing a dissolution solution by dissolving, in a strong acid, a hydroxide mixture comprising nickel and impurities; separating the impurities by injecting an organic material into the dissolution solution; injecting a first neutralizer into the post solution from which impurities are separated and calcining the same, so as to obtain nickel oxide; and preparing a nickel product by reducing the nickel oxide.
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