Abstract

A method for improving the particle size and morphology of a neutralizer for the hydrometallurgical treatment of lateritic nickel ore. In the technological process for producing nickel-cobalt-manganese hydroxide by means of the hydrometallurgical treatment of lateritic nickel ore, a nickel-cobalt-manganese-containing feed liquid is successively subjected to a first-stage iron and aluminum removal treatment and a second-stage iron and aluminum removal treatment by using a neutralizer, wherein the amount of neutralizer passing through a 200-mesh sieve is in a mass ratio range of 85-90%, and the sphericity coefficient of solid particles in the neutralizer is not lower than 0.6. The particle size and morphology of the neutralizer are respectively improved, and then the neutralizer is applied to a first-stage iron and aluminum removal treatment step and a second-stage iron and aluminum removal treatment step, ensuring that the surface roughness of the solid particles in the neutralizer can be relatively low while effectively improving the iron and aluminum removal rates of the first-stage iron and aluminum removal treatment step and the second-stage iron and aluminum removal treatment step, thereby reducing the speed at which a precipitate is generated by a reaction of nickel-cobalt-manganese ions with an alkali in some regions. Consequently, the loss of nickel, cobalt and manganese is reduced, and the yield of nickel-cobalt-manganese hydroxide produced by means of the hydrometallurgical treatment of lateritic nickel ore is further increased.

IPC Classes  ?

• C22B 23/00 - Obtaining nickel or cobalt
• C22B 3/00 - Extraction of metal compounds from ores or concentrates by wet processes

Abstract

An equipment system for preparing a new-energy nickel-cobalt-manganese raw material from lateritic nickel ore. The system comprises a raw and auxiliary material supply module (a), a leaching reaction module (b), a neutralization and impurity removal module (c), a nickel-cobalt-manganese mixed hydroxide synthesis module (d), a crystal manufacturing module (f), a ternary precursor manufacturing module (g), a ternary positive electrode material manufacturing module (h), and other modules. The system overcomes defects in the prior art and process defects, as the system not only realizes simultaneous efficient extraction of nickel, cobalt and manganese by means of a green technique and process for simultaneously extracting nickel, cobalt and manganese from low-grade lateritic nickel ore, but also performs safe cyclic disposal of wastewater, waste residues and waste gas by means of an energy-saving and emission-lowering green technique and a clean production process; and the system has energy-saving, carbon-emission-lowering and pollution-reducing effects, maximizes the comprehensive recovery of nickel, cobalt and manganese, effectively resolves the contradiction between supply and demand of scarce strategic nickel-cobalt-manganese resources in the new-energy industry, and is completely in line with global trends of green development and dual-carbon economies.

IPC Classes  ?

• C22B 3/02 - Apparatus therefor

Abstract

A green method for producing a nickel-cobalt-manganese new energy raw material from laterite nickel ore based on hydrometallurgy, mainly comprising ore blending, ore washing, ore separation, pressurization leaching or oxygen pressure leaching, cyclic leaching and neutralization, counter-current washing, multi-segment removal of iron chromium aluminum, multi-segment synthesis of nickel-cobalt-manganese hydroxide, ion extraction, preparation of a nickel-cobalt-manganese mixed salt solution, preparation of a separate nickel-cobalt-manganese salt solution, preparation of a nickel-cobalt-manganese mixed salt crystal, preparation of a separate nickel-cobalt-manganese salt crystal, preparation of a ternary precursor, comprehensive treatment of wastewater, waste gas, and waste residue, and other techniques and processes. Efficient simultaneous extraction of nickel-cobalt-manganese is achieved; ferrochrome, copper, zinc, scandium and other valuable metal elements are effectively recovered; a nickel-cobalt-manganese raw material meeting the requirement of a high-nickel ternary battery is produced; and a ternary precursor material directly used for manufacturing of the ternary battery is manufactured.

IPC Classes  ?

• C22B 23/00 - Obtaining nickel or cobalt

Abstract

Provided is a laterite-nickel ore leaching flash tank-preheater heat exchange automatic allocation system. The system comprises a preheating mechanism (1), a high-pressure kettle (2), a flash evaporation mechanism (3), a monitoring mechanism (4), and an allocation controller; the preheating mechanism (1) comprises a plurality of preheaters (11) which are sequentially connected in series; the flash evaporation mechanism (3) comprises a plurality of flash tanks (31) which are sequentially connected in series. The beneficial effects are: operation data of preheaters and flash tanks are detected in real time by means of the monitoring mechanism, and the allocation controller obtains optimal set pressures and optimal set temperatures of the flash tanks on the basis of the data detected by the monitoring mechanism, so that a temperature and pressure control system for the flash tanks can adjust the temperatures and pressures in the flash tanks to the optimal set temperatures and the optimal set pressures, thereby improving the heat exchange efficiency, and reducing the energy consumption and operation cost of a laterite-nickel ore high-pressure leaching process.

IPC Classes  ?

• C22B 23/00 - Obtaining nickel or cobalt

Abstract

A lateritic nickel ore hydrometallurgy precipitation system. The lateritic nickel ore hydrometallurgy precipitation system comprises a reaction tank (100), a feeding assembly (200), and a discharging assembly (300), wherein the reaction tank (100) is internally provided with an accommodating cavity (110). The feeding assembly (200) comprises a first introducing pipe (210) and a second introducing pipe (220); the second introducing pipe (220) is communicated with the first introducing pipe (210); and the first introducing pipe (210) is communicated with the accommodating cavity (110). The discharging assembly (300) comprises a material lifting pipe (310) and an air guiding pipe (320); one end of the material lifting pipe (310) is communicated with the bottom of the accommodating cavity (110); the air guiding pipe (320) extends below the liquid level in the material lifting pipe (310); and the position where the air guiding pipe (320) is communicated with the material lifting pipe (310) is lower than the end of the material lifting pipe (310) distant from the accommodating cavity (110). Air is introduced into the material lifting pipe (310) by using the air guiding pipe (320), and due to the presence of bubbles in a solid-liquid mixture in the material lifting pipe (310), the liquid level in the material lifting pipe (310) rises under the action of atmospheric pressure, and finally the solid-liquid mixture at the bottom of the accommodating cavity (110) is discharged by means of the material lifting pipe (310). The system can directly discharge a precipitate at the bottom of the accommodating cavity (110), thereby avoiding frequent manual cleaning of residues in the accommodating cavity (110), and prolonging the cycle of manual cleaning of the reaction tank (100).

IPC Classes  ?

• C22B 3/02 - Apparatus therefor

Abstract

333; S3, leaching the second-stage distillation residues by using a leaching solution to obtain leaching residues and a leachate; and carrying out scandium precipitation treatment on the leachate to obtain a scandium precipitate and a residual solution after scandium precipitation; and S4, adjusting the pH value of said residual solution to carry out precipitation treatment to obtain a nickel-cobalt hydroxide. The obtained aluminum, iron and scandium products have high purity and high recovery rate.

IPC Classes  ?

• C22B 3/10 - Hydrochloric acid
• C22B 23/00 - Obtaining nickel or cobalt
• C22B 21/00 - Obtaining aluminium
• C22B 59/00 - Obtaining rare earth metals

Abstract

The present invention relates to an automatic ore washing production line, comprising: a cylinder ore washing machine, a groove type ore washing machine, a vibrating screen, an ore pulp storage mechanism, a hydrocyclone, and a control mechanism. The control mechanism comprises a first electromagnetic flowmeter, a first adjusting valve, a second electromagnetic flowmeter, a third electromagnetic flowmeter, a second adjusting valve, a plurality of liquid level measurement devices, a concentration measurement device, and a driving controller. In the present invention, compared with the prior art, a first electromagnetic flowmeter, a second electromagnetic flowmeter, a third electromagnetic flowmeter, liquid level measurement devices, and a concentration measurement device are configured to respectively measure the flow rate of the cylinder ore washing machine, the flow rate of the groove type ore washing machine, the liquid level in a pump tank, and the concentration of the ore pulp in the pump tank, and then respective devices are adjusted on the basis of measurement data, so that the devices in the automatic ore washing production line can stably operate.

IPC Classes  ?

• B03B 9/00 - General arrangement of separating plant, e.g. flow sheets
• B03B 7/00 - Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage

Abstract

The present invention relates to a drum ore washer for wet smelting of laterite-nickel ore. The drum ore washer comprises a mounting rack, a screening assembly, an adjuster and an ore washing assembly, wherein the screening assembly comprises a rack, a drum, a screen cylinder and a driving assembly, the drum is rotationally installed on the rack in the axis of a first direction, the screen cylinder is sleeved in the drum, a feeding port and a discharging port are respectively provided at opposite ends of the screen cylinder in the first direction, the screen cylinder is gradually inclined downwards in a direction from the feeding port to the discharging port, a plurality of screen holes are formed in a cylinder wall of the screen cylinder, a baffle protrudes from an inner side wall of the screen cylinder, the baffle and the screen cylinder are obliquely arranged in a radial direction and are located at the discharging port, the driving assembly is connected to the drum, the rack is movably arranged on the mounting rack such that an inclination angle of the screen cylinder is adjustable, the adjuster is connected to the rack, and the ore washing assembly is arranged on the rack. The drum ore washer of the present invention can retard a moving speed of ore in the direction of the discharging port, prolong retention time of the ore in the screen cylinder, improve the ore washing efficiency and also improve a washing effect.

IPC Classes  ?

• B08B 3/02 - Cleaning by the force of jets or sprays
• B08B 13/00 - Accessories or details of general applicability for machines or apparatus for cleaning
• B07B 1/22 - Revolving drums
• B07B 1/46 - Constructional details of screens in general; Cleaning or heating of screens

Abstract

A method for measuring chromium content in a laterite nickel ore, comprising the following steps: S1, adding in sequence nitric acid, phosphoric acid, perchloric acid, and sulfuric acid to a laterite nickel ore sample to be measured, and mixing evenly to obtain a mixed solution A; S2, when the amount of nitric acid is not 0, heating the mixed solution A to remove water and nitric acid, and then raising the temperature to remove perchloric acid, to obtain a mixed solution C; when the amount of nitric acid is 0, heating the mixed solution A directly to remove water and perchloric acid, to obtain a mixed solution C; S3, cooling the mixed solution C, adding water to dilute, boiling again to dissolve salts, cooling, filtering, and diluting for use, and recording as a mixed solution D; and S4, testing the mixed solution D by ICP to calculate the chromium content in the laterite nickel ore. By using nitric acid, phosphoric acid, perchloric acid, and sulfuric acid to perform redox reaction and combining the same with ICP to perform testing, the problems of few process sample testing and analysis methods, long detection time, and complicated procedures in the hydrometallurgy of laterite nickel ore are solved.

IPC Classes  ?

• G01N 1/40 - Concentrating samples
• G01N 21/73 - Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited using plasma burners or torches

Abstract

An automatic descaling apparatus and method for a laterite-nickel ore high-pressure leaching system, said automatic descaling apparatus and method relating to the technical field of descaling apparatuses. The automatic descaling apparatus comprises a high-pressure reaction kettle (1), a first pressure sensor (22), a second pressure sensor (23), an acid supply assembly (3), a collecting assembly, and a main controller. The inside of the high-pressure reaction kettle (1) is provided with a reaction cavity (11). The acid supply assembly (3) comprises an acid storage tank (31), a second pipeline (32), and a first switch (33), the second pipeline (32) communicating the acid storage tank (31) and a first pipeline (21), and the first switch (33) being arranged on the second pipeline (32). The collecting assembly comprises a collecting tank (41), a third pipeline (43), and a second switch (44), two ends of the third pipeline (43) being in communication with the collecting tank (41) and the first pipeline (21). The main controller is connected to each of the first pressure sensor (22), the second pressure sensor (23), the first switch (33), and the second switch (44). When the pressure difference between the first pressure sensor (22) and the second pressure sensor (23) reaches a point within a preset range, the main controller can automatically control the first switch (33) to turn on and control the second switch (44) to turn off, enabling acidic substances in the acid storage tank (31) to flow into the reaction cavity (11); the degree of automation and smartness is high.

IPC Classes  ?

• C22B 3/02 - Apparatus therefor

Abstract

The present invention relates to a system and method with a reduction in the moisture content and impurities of nickel-cobalt hydroxide. The system with a reduction in the moisture content and impurities of nickel-cobalt hydroxide comprises a thickener, a cleaning apparatus, a filter press apparatus, and an intermediate storage chamber. The cleaning apparatus comprises a housing, a stirring device, and a steam pipeline, wherein the housing is provided with a cleaning tank, and the housing is further provided with a feeding port, a steam inlet, and a discharging port which are in communication with the cleaning tank, the feeding port being in communication with the thickener, and the discharging port being connected to the filter press apparatus; the stirring device is arranged on the housing, the stirring device being used for stirring and washing materials in the cleaning tank; and the steam pipeline is wound on the periphery of the intermediate storage chamber, an outlet of the steam pipeline being in communication with the steam inlet, the steam pipeline being used for conveying steam into the cleaning tank after heat exchange with the materials in the intermediate storage chamber. In the present invention, by passing materials through the thickener, the cleaning apparatus, and the filter press apparatus, and using steam to exchange heat with the materials in the intermediate storage chamber, the moisture content and impurities of nickel-cobalt hydroxide are further reduced, facilitating subsequent processing.

IPC Classes  ?

• C22B 3/20 - Treatment or purification of solutions, e.g. obtained by leaching

Abstract

The present invention relates to a laterite-nickel ore hydrometallurgy post-treatment fine control system and method. Said system comprises a plurality of reaction devices connected in order and a plurality of pH value adjusting devices in one-to-one correspondence with the plurality of reaction devices. Each reaction device has a preset pH value, and the preset pH values of any two reaction devices are different. Each pH value adjusting device comprises a pH value adjusting module, a pH value online measurement module and a feedback control module, the feedback control module being connected to the pH value adjusting module and the pH value online measurement module. The present invention solves the following problems: during the process of introducing a neutralization solution into a mixed solution to adjust a pH value, local over-alkalinity may occur at the position where the neutralization solution is added, thus causing generation of non-target precipitates; during an early stage of adjustment, the pH difference value between the neutralization solution and the mixed solution may be large, thus causing the generated non-target precipitates to redissolve; and during a final stage of adjustment, the pH difference value between the neutralization solution and the mixed solution may be small, thus making it difficult for the non-target precipitates to dissolve, thereby reducing the final nickel and cobalt recovery rate.

IPC Classes  ?

• C22B 3/02 - Apparatus therefor
• C22B 3/06 - Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions
• C22B 23/00 - Obtaining nickel or cobalt

Abstract

The invention belongs to the technical field of hydrometallurgy. Provided is a short-process nickel-cobalt-manganese co-extraction process for hydrometallurgy of lateritic nickel ore. The process comprises the following steps: subjecting an iron- and aluminum-removed leachate of lateritic nickel ore to co-extraction by means of an organic acid extraction system, so as to obtain an enriched nickel-cobalt-manganese solution; and subjecting the enriched nickel-cobalt-manganese solution to impurity extraction by means of a P204 extraction system, so as to obtain a high-purity nickel-cobalt-manganese solution. By means of the co-extraction process, a current hydrometallurgical process for extracting nickel, cobalt and manganese from lateritic nickel ore is simplified, the amounts of an acid, an alkali and an extracting agent, the energy consumption and the amount of water used in the extraction process are greatly reduced, the extraction cost of nickel, cobalt and manganese is reduced, and the process is of great significance to the industrial production of ternary nickel-cobalt-manganese raw materials; moreover, the process can achieve the co-extraction of nickel, cobalt and manganese, the purity of nickel, cobalt and manganese is high, and the loss of nickel and cobalt is low; and the content and proportions of nickel, cobalt and manganese metals in the obtained high-purity nickel-cobalt-manganese solution are adjusted according to the ratio these metals in a ternary precursor product, and finally the high-purity nickel-cobalt-manganese solution is used for preparing a nickel-cobalt-manganese ternary positive electrode material.

IPC Classes  ?

• C22B 23/00 - Obtaining nickel or cobalt

Abstract

Disclosed in the present invention is a method for recovering Sc from an iron-aluminum slag in a lateritic nickel ore high-pressure acid leaching process, comprising the following steps: S1, leaching a raw material iron-aluminum slag by using sulfuric acid, and carrying out pressure filtration to obtain a leachate; S2, evaporating and concentrating the leachate to obtain a concentrated solution, and adding the raw material iron-aluminum slag and sodium sulfate into the concentrated solution to obtain a mixture; S3, pressurizing and heating the mixture, the pressurization pressure being 4.5-5.0 MPa and the heating temperature being 250-260°C, and then carrying out solid-liquid separation to obtain a slag phase and a liquid phase; and S4, sequentially carrying out extraction, back extraction, scandium salt precipitation, and roasting on the liquid phase to obtain scandium oxide. The recovery rate of scandium is high, and the steps are simple.

IPC Classes  ?

• C22B 59/00 - Obtaining rare earth metals
• C22B 3/08 - Sulfuric acid
• C22B 7/00 - Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof

Abstract

A process for treating wastewater in the preparation process of nickel-cobalt hydroxide, which process comprises the following steps: S1, sequentially subjecting a lateritic nickel ore pickle liquor to iron and aluminum removal and nickel and cobalt precipitation, so as to obtain wastewater; S2, sequentially removing chromium ions, manganese ions and silicon ions from the wastewater, so as to obtain a suspension; and S3, recycling part of the suspension, and continuing to remove iron and aluminum therefrom; and sequentially subjecting the remaining suspension to homogenization, an alkali adjustment, standing and CCD countercurrent washing, performing solid-liquid separation to obtain a supernatant and a residue phase, collecting the residue phase, neutralizing the supernatant, and then discharging the supernatant. Pollutants in lateritic nickel ore wastewater treated by means of the method can reach the discharge standard, and high safety is achieved.

IPC Classes  ?

• C02F 9/00 - Multistage treatment of water, waste water or sewage

Abstract

The present invention relates to a method for improving the quality of nickel-cobalt hydroxide. In the present invention, iron and aluminum are removed, then sulfur dioxide and air are directly used to oxidize manganese in iron- and aluminum-removed liquid, to directly convert manganese into manganese oxides such as manganese dioxide; manganese is removed first, so that the costs of continuous addition of a reducing agent are saved; and manganese-removed liquid is treated to be an alkali-converted crystal mush of which the manganese content is reduced, and insoluble non-reactive manganese oxides would not be produced due to excessive alkali, so that the manganese content in nickel-cobalt hydroxide products is reduced, and the quality of the nickel-cobalt hydroxide products is improved.

IPC Classes  ?

• C01G 53/04 - Oxides; Hydroxides
• C01G 51/04 - Oxides; Hydroxides
• C01G 45/02 - Oxides; Hydroxides

Abstract

A method for continuously preparing a mixed hydroxide precipitate by means of laterite-nickel ore hydrometallurgy. Primary mixed hydroxide precipitate particles are used as crystal nucleuses; by controlling precipitation process conditions, the quantity of the crystal nucleuses and the reaction time of the crystal nucleuses, the primary mixed hydroxide precipitate crystal nucleuses gradually grow, and the crystal forms become larger; and compact mixed hydroxide precipitate particles having narrow particle size distribution and better sedimentation effect are obtained by controlling the number of cycles, the proportion of returned seeds and the homogenization proportion of a precipitant, so that the water content of the mixed hydroxide precipitate is reduced. The preparation method has a certain guiding effect on actual production, and thus has good application prospects.

IPC Classes  ?

• C22B 23/00 - Obtaining nickel or cobalt
• C01G 53/00 - Compounds of nickel
• C22B 3/22 - Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means

Abstract

244 into the reaction kettle (1); regulating the internal temperature and the internal pressure; and respectively adding the first scale inhibitor and the second scale inhibitor at the acid adding end (102) and the material discharging end (106) of the reaction kettle (1). By providing the first scale inhibiting mechanism (104) and the second scale inhibiting mechanism (105), the first scale inhibitor and the second scale inhibitor of different types are respectively added at the acid adding end (102) and the material discharging end (106) of the reaction kettle (1), so that the scaling of different types of substances can be inhibited, thereby achieving a more targeted scale inhibiting effect.

IPC Classes  ?

• C22B 3/06 - Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions
• C22B 23/00 - Obtaining nickel or cobalt

Abstract

Provided are a system and process for regulating the Al precipitation amount during high-pressure acid leaching of laterite-nickel ore. The system comprises: an autoclave (1), comprising a body (11), a first adding pipe (12), a second adding pipe (13), and a discharging pipe (14); a downstream treatment device (2), the downstream treatment device (2) being connected to the discharging pipe (14); and a regulation apparatus (3), comprising a first valve (31), a second valve (32), a first pressure sensor (33), a second pressure sensor (34), an aluminum ion measurement apparatus (35), and a regulation unit. The process comprises: on the basis of the concentration of aluminum ions in a leachate, increasing the addition amount of an inhibitor or the addition flow rate of a promoter; and when the pressure drop difference of the discharging pipe exceeds a set range, increasing the addition flow rate of the inhibitor to mitigate pipe scaling. The system and the process can reduce fluctuations in production, stabilize production, and lower production and maintenance costs.

IPC Classes  ?

• C22B 3/02 - Apparatus therefor
• C22B 23/00 - Obtaining nickel or cobalt

Abstract

A high-pressure reactor, comprising: a reactor (1), one end of which is a feeding end (101) and the other end thereof is a discharging end (102), wherein a plurality of partition plates (2) are provided in the reactor (1) sequentially in a material flow direction, the plurality of partition plates (2) divide a cavity of the reactor (1) into a plurality of compartments (103), a stirring device (3) is arranged in each compartment (103), upper portions of any two adjacent compartments (103) are in communication with each other, and an ore pulp inlet (4), a steam inlet (5) and an acid inlet (6) are sequentially circumferentially provided on a compartment (103) into which materials are fed in a stirring rotation direction about the stirring device (3), which is taken as an axis. After ore pulp enters the reactor, under the action of stirring of the stirring device (3), the ore pulp entering the reactor comes into contact with steam first, continues to be heated, then comes into contact with an acid to react with the acid in the form of an exothermic reaction, and heat generated by the reaction moves to the ore pulp entering a first ore pulp port (41) in a fluid direction, so as to heat newly fed ore pulp.

IPC Classes  ?

• B01J 3/04 - Pressure vessels, e.g. autoclaves
• B01J 19/18 - Stationary reactors having moving elements inside

Abstract

The present invention relates to a laterite nickel ore beneficiation device and process, the device comprises: a cylindrical ore washer, a trough ore washer, a vibrating screen, a hydrocyclone connected to the trough ore washer and the vibrating screen, a first thickener connected to the hydrocyclone, a spiral chute connected to the hydrocyclone, a first ball mill connected to the spiral chute, and a second thickener connected to the first ball mill, connected in sequence; the process comprises: sequentially performing three-stage sorting and re-selection on a ore material; performing settling on the ore material that meets the requirements after the three-stage sorting and re-selection; and performing crushing, grinding, and settling on the ore material that meets the requirements. The present invention makes full use of the ore, reduces the waste of the ore, and improves the collection rate of nickel.

IPC Classes  ?

• B03B 9/00 - General arrangement of separating plant, e.g. flow sheets
• B03B 7/00 - Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage

Abstract

444 trapping agent is further synthesized in the present invention, thereby achieving high-value reutilization of silicon slag.

IPC Classes  ?

• C22B 23/00 - Obtaining nickel or cobalt

Abstract

A laterite nickel ore hydrometallurgy pre-neutralization system and method. The pre-neutralization system comprises an iron precipitation unit (10), a first neutralization unit (20), a second neutralization unit (30), and a control unit. The iron precipitation unit (10) receives high-pressure leaching slurry. The first neutralization unit (20) is connected to the iron precipitation unit (10) and can receive slurry formed after anhydrous sodium sulfate is supplied, and iron-aluminum slag and nickel-cobalt slag can be supplied. The second neutralization unit (30) is connected to the first neutralization unit (20). The first neutralization unit (20) can receive the slurry formed after the iron-aluminum slag and the nickel-cobalt slag are supplied, and is used for neutralizing acid in the slurry by supplying a neutralizer. The iron precipitation unit (10), the first neutralization unit (20), and the second neutralization unit (30) are arranged separately, and additionally, the control unit precisely controls the anhydrous sodium sulfate, the iron-aluminum slag, the nickel-cobalt slag and the neutralizer, so that the amounts of the added anhydrous sodium sulfate, iron-aluminum slag, nickel-cobalt slag and neutralizer can be within an appropriate range, and the economic benefit of laterite nickel ore hydrometallurgy is improved.

IPC Classes  ?

• C22B 3/44 - Treatment or purification of solutions, e.g. obtained by leaching by chemical processes

Abstract

An acid feeding system for a high-pressure kettle for laterite-nickel ore hydrometallurgy, comprising: a liquid acid supply tank, an acid feeding pipeline, an acid feeding pump, pressurizers, and a high-pressure reaction kettle, wherein one end of the acid feeding pipeline is communication with the high-pressure reaction kettle, and the other end of the acid feeding pipeline is communicated with the liquid acid supply tank; the acid feeding pump is arranged on the acid feeding pipeline and used for pressurizing and pumping a liquid acid in the liquid acid supply tank to the high-pressure reaction kettle by means of the acid feeding pipeline; the pressurizers are arranged on the acid feeding pipeline and used for dynamically containing or discharging the liquid acid so as to reduce pressure fluctuation in the acid feeding pipeline. Pressurizers are arranged on the acid feeding pipeline, and the pressurizers can contain part of the liquid acid when the pressure in the acid feeding pipeline is too high so as to decrease the pressure of the acid feeding pipeline, or discharge part of the liquid acid when the pressure in the acid feeding pipeline is too low so as to increase the pressure of the acid feeding pipeline, thereby achieving the purpose of reducing pressure fluctuation in the acid feeding pipeline, keeping the pressure of the liquid acid in the acid feeding pipeline within a proper range, and improving the effect of acid leaching in the high-pressure reaction kettle.

IPC Classes  ?

• C22B 3/02 - Apparatus therefor
• C22B 3/06 - Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions
• C22B 23/00 - Obtaining nickel or cobalt

Abstract

The present invention relates to the technical field of powder. Disclosed is a device for preparing limestone slurry and calcium hydroxide for laterite-nickel ore hydrometallurgy, comprising a limestone slurry preparation component and a calcium hydroxide preparation component. The limestone slurry preparation component comprises a first feeder, a pulverizer, a mixer, a first conveying pump and a first buffer tank which are sequentially connected, and when the weight of limestone slurry in the first buffer tank is not within a preset range, the first feeder, the pulverizer, the mixer and the first conveying pump can adjust respective working speeds. The calcium hydroxide preparation component comprises a lime kiln, a second feeder, a nitration machine, a third conveying pump and a second buffer tank which are sequentially connected, and when the weight of calcium hydroxide of the second buffer tank is not within a preset range, the lime kiln, the second feeder, the nitration machine and the third conveying pump can adjust respective working speeds. The whole production line can achieve linkage response, the production efficiency is integrally and automatically adjusted, and the intelligent degree is high.

IPC Classes  ?

• C04B 2/08 - Devices therefor

Abstract

An acid-containing tail gas washing treatment system, comprising: a washing water storage tank (1), the washing water storage tank (1) being provided with a first washing water inlet (11), a second washing water inlet (12), and a washing water outlet; a first buffer kettle (2), the first buffer kettle (2) being provided with a first tail gas inlet (21), a washing liquid inlet, and a first liquid discharging port; a swirler (3), the swirler (3) being provided with a first swirler inlet, a second swirler inlet (31), and a swirler outlet; a main tower (4), communicated with the swirler outlet, an exhaust port being formed in the top of the main tower (4); and a regulation and control device (5), the regulation and control device (5) comprising a regulation and control unit, a gas acidity detector (51), and a first control valve (52). The acid-containing tail gas washing treatment system is provided with the regulation and control unit, the gas acidity detector (51), and the first control valve (52), the pH value of gas from the exhaust port of the main tower (4) can be measured, and the regulation and control unit compares the pH value of the gas with a preset range, controls the opening degree of the first control valve (52), and adjusts the adding flow rate of liquid alkali, so that the gas discharged from the exhaust port of the main tower (4) always meets the requirements, thereby achieving the objective of environmental protection.

IPC Classes  ?

• B01D 53/78 - Liquid phase processes with gas-liquid contact
• B01D 53/79 - Injecting reactants
• B01D 53/40 - Acidic components

Abstract

A method for removing iron and aluminum from a lateritic nickel ore leachate by means of a goethite process, which method comprises the following steps: first-stage iron and aluminum removal, involving: adding a precipitant solution to a lateritic nickel ore leachate, reacting same for 45-90 minutes with the feeding speed controlled to be 5-80 mL/min, the pH controlled to be 3.0-3.2 and the reaction temperature controlled to be 60-70ºC, and performing solid-liquid separation, so as to obtain first-stage iron and aluminum residues and a filtrate; and second-stage iron and aluminum removal, involving: adding a precipitant solution to the filtrate, reacting same for 30-60 minutes with the pH controlled to be 4.3-4.4 and the reaction temperature controlled to be 60-70ºC, and performing solid-liquid separation, so as to obtain second-stage iron and aluminum residues and a purified liquid. Two-stage iron and aluminum removal is used; in the first stage, iron ions in the leachate are effectively separated at a relatively low pH value by controlling the feeding speed, generated residue particles are large, good filtering performance is achieved, and few valuable metals such as nickel, cobalt and manganese are entrained in the residues; in the second stage, the pH is adjusted to 4.3-4.4 to precipitate aluminum ions and the remaining iron ions; and the whole technological process is simple.

IPC Classes  ?

• C22B 3/44 - Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
• C22B 23/00 - Obtaining nickel or cobalt

Abstract

A method for dynamically regulating conditions of a high-pressure leaching reaction of a laterite nickel ore, comprising: setting a target temperature and target pressure of an autoclave; obtaining thermal power required for heating fed ore pulp to the target temperature; obtaining thermal power brought by fed acid; obtaining required new steam thermal power; obtaining the required flow of new steam; adjusting the real-time flow of the new steam to the required flow of the new steam, and adjusting the opening degree of an exhaust valve and the discharging flow of the autoclave, so that the real-time pressure of the autoclave is equal to the target pressure; and adjusting the flow of the new steam, so that the real-time temperature of the autoclave is equal to the target temperature. The method has the beneficial effect that: reaction conditions of a high-pressure leaching reaction are preliminarily determined on the basis of a feeding status, and then reaction control conditions are adjusted on the basis of the feedback of the real-time temperature and real-time pressure in the autoclave; and by combining the described two regulation modes, the temperature and the pressure in the autoclave can be maintained at an optimal temperature and optimal pressure, thereby improving the laterite nickel ore leaching efficiency.

IPC Classes  ?

• C22B 3/06 - Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions

Abstract

Disclosed in the present invention is a method for preparing a high-purity iron elementary substance from laterite-nickel ore smelting slag, comprising the following steps: ball-milling and mixing laterite-nickel ore smelting slag and a reducing agent to obtain a ball-milled mixture; smelting and slagging the ball-milled mixture to obtain a molten iron-manganese liquid and aluminum-silicon-calcium slag; casting the molten iron-manganese liquid to obtain an iron-manganese alloy; and carrying out electrolytic refining by using the iron-manganese alloy as an anode to obtain a high-purity iron elementary substance. According to the present invention, first, one-step reductive melting is carried out to reduce a trivalent iron oxide present in laterite-nickel ore smelting slag into a liquid metal elementary substance under the action of high temperature and a reducing agent, and the remaining major phases are combined with each other to form calcium aluminosilicate which floats on the surface of the liquid iron elementary substance and is then removed by slagging; and then, iron and manganese in a reduction product are separated by means of electrolytic refining. The effective recovery rate of iron in laterite-nickel ore smelting slag is improved, and the high-purity iron elementary substance can be prepared.

IPC Classes  ?

• C21B 13/00 - Making spongy iron or liquid steel, by direct processes
• C22B 7/00 - Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof
• C22B 1/00 - Preliminary treatment of ores or scrap

Abstract

A combined heat exchange system for laterite-nickel ore leaching flash tanks (21, 22, 23) and preheating towers (31, 32, 33), the system comprising a high-pressure reaction kettle (1), the preheating towers (31, 32, 33) and the flash tanks (21, 22, 23), wherein the preheating towers (31, 32, 33) are connected to a feeding port of the high-pressure reaction kettle (1); the flash tanks (21, 22, 23) are connected to a discharging port of the high-pressure reaction kettle (1), and the flash tanks (21, 22, 23) are further in communication with the preheating towers (31, 32, 33) by means of steam pipes; a pressure relief cavity (241) and a buffer assembly (28) are provided in each of the flash tanks (21, 22, 23), wherein the buffer assembly (28) comprises a buffer member (281) and a connecting structure (282) which are connected to each other, and the buffer member (281) has a central protrusion (286) and is provided with a buffer groove (287); and the highest point of the central protrusion (286) is higher than the lowest point of the buffer groove (287), a surface of the central protrusion (286) is connected to a surface of the buffer groove (287), and a fluid falling from a pressure relief cavity (241) can pass through the surface of the central protrusion (286) and slide out from one end to the other end of the buffer groove (287), thereby achieving a buffering effect.

IPC Classes  ?

• B01D 3/06 - Flash distillation
• B01D 3/42 - Regulation; Control
• B01J 3/04 - Pressure vessels, e.g. autoclaves
• B01J 3/02 - Feed or outlet devices therefor
• C22B 23/00 - Obtaining nickel or cobalt
• F28D 21/00 - Heat-exchange apparatus not covered by any of the groups