The present disclosure relates to the fields of chemical engineering and environmental protection, and in particular to a method of preparing high purity copper sulfate by using an acidic copper chloride etching waste liquid, which includes: introducing liquid ammonia into a first acidic copper chloride etching solution and a second acidic copper chloride etching solution, mixing the obtained solutions and allowing the mixture to be subjected to crystallization and filtration to produce an intermediate copper oxychloride; washing and separating copper oxychloride and adding it into a sulfuric acid solution to obtain a copper sulfate slurry, and then adding water to the copper sulfate slurry and performing cooling, crystallization and separation to obtain Semi-finished copper sulfate; adding a first solution to Semi-finished copper sulfate and then performing heating, and temperature-controlled filtration, and performing cooling, crystallization and centrifugation on an obtained first filtrate so as to obtain a high purity copper sulfate.
The present invention relates to the technical field of water treatment, and more specifically relates to a recycling treatment method for a BOE waste liquid. The key point of the technical solution of the method comprises the following steps: S1, adding a sodium salt solution to a BOE waste liquid for reaction to obtain sodium fluosilicate and a first waste liquid; S2, adding an aluminum salt solution to the first waste liquid, and adjusting the pH to 4-7 to obtain cryolite and a second waste liquid; S3, adding a fluorine removal agent and a recapturing agent to the second waste liquid to obtain a first waste residue and a third waste liquid; S4, adjusting the pH of the third waste liquid to 2-4, and subjecting the third waste liquid to evaporative crystallization to obtain evaporated condensate water and a concentrated solution; S5, pumping the concentrated solution into a cooling crystallization tank for cooling, subjecting same to centrifugal separation to obtain an ammonium salt and a final mother solution; and S6, returning the third waste liquid and the final mother solution to S1 and S2 for circulation. The present invention can achieve resource recovery of components in the BOE waste liquid, and has the advantage of obtaining high-value sodium fluosilicate, cryolite and agricultural ammonium salt products.
The present disclosure relates to the technical field of resource utilization of ammonia-nitrogen wastewater and in particular to a system for determining an evaporation endpoint by image recognition in an evaporation and crystallization process of an ammonia-nitrogen wastewater. The key points of the technical scheme are as follows: the system includes an evaporator, a sampling platform, a data transmission module, and an image recognition system; the sampling platform is disposed below an evaporation interface of the evaporator to collect crystals dropping from the evaporation interface and collect image information of the crystals; the data transmission module is configured to transmit data of the sampling platform to the image recognition system; the image recognition system is configured to process the image information of the crystals obtained by the sampling platform and determine an evaporation and crystallization endpoint.
The present disclosure relates to the field of battery technologies and in particular to a bipolar current collector modified by a self-healing conductive coating and a preparation method and application thereof. The key points in the technical scheme are as follows: the method includes: preparing microcapsules containing a healing agent; preparing a slurry containing the microcapsules, a catalyst, an adhesive and a conductive filler; coating the slurry on a surface of a current collector substrate to obtain a bipolar current collector with a self-healing conductive coating. in a case of occurrence of perforation of the current collector, the self-healing microcapsules in the self-healing conductive coating may crack under an external stress and the healing agent is released and can immediately perform polymerization reaction under the action of a catalyst to generate a self-heating material which can quickly and accurately repair the cracks or holes on the current collector layer.
The present invention relates to the technical field of chemical-industry product preparation, and more specifically to a method for preparing high-purity basic copper carbonate. The key points of the technical solution comprising the following steps: S1. obtaining an ammonium carbonate solution; S2. adding a copper-containing compound into the ammonium carbonate solution, stirring in a water bath, and after the reaction is complete, separating the solid and the liquid to obtain a copper-based precursor and a copper ammonia carbonate solution; S3. adding the copper-based precursor into water, and performing negative-pressure heating decomposition to obtain high-purity basic copper carbonate; and S4. performing negative pressure heating decomposition on the copper ammonia carbonate solution to obtain ordinary basic copper carbonate. The invention has the advantages of reducing the cost of raw materials and improving the purity and yield of basic copper carbonate.
The present invention relates to the field of preparation and use of nano materials, and in particular, to a preparation method and use of nano copper phosphide. The key point of the technical solution of the present invention is that: the method comprises the following steps: (1) dissolving chitosan in an aqueous solution of ascorbic acid to obtain a first mixed solution; (2) slowly adding an aqueous solution of sodium hydroxide into the first mixed solution to obtain a second mixed solution; (3) dropwise adding an aqueous solution of copper nitrate into the second mixed solution, and obtaining a third mixed solution after complete reaction; (4) centrifuging the third mixed solution, collecting a centrifugal product, and carrying out vacuum drying on the centrifugal product to obtain a dried product; and (5) placing the dried product downstream of a tube furnace, placing a phosphorus source upstream of the tube furnace, and heating under the protection of an inert gas to obtain a copper phosphide sample. The present invention has a simple process and saves costs, the prepared nano copper phosphide is of a hollow nanosphere structure, and such a structure has excellent performance as an HER catalyst.
C25B 11/075 - Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalysts material consisting of a single catalytic element or catalytic compound
C25B 1/04 - Hydrogen or oxygen by electrolysis of water
B82Y 40/00 - Manufacture or treatment of nanostructures
7.
TREATMENT METHOD OF LEACHATE OF HAZARDOUS WASTE LANDFILL SITE
The present disclosure relates to the field of water treatment technologies, and in particular to a treatment method of a leachate from hazardous waste landfill site. The key points of the technical scheme were as follows: adding sodium carbonate to the leachate to obtain a calcium carbonate residue and a first waste liquid; adding hydrochloric acid to the first waste liquid to obtain a first mixed solution; heating the first mixed solution and introducing a given amount of chlorine gas into the first mixed solution while introducing air, to obtain a second waste liquid and a first mixed gas; introducing the first mixed gas into an alkaline liquid absorption tower; heating the second waste liquid to obtain an evaporation condensate water and a concentrated liquid; centrifuging the concentrated liquid to obtain a sodium chloride wet salt and a centrifuged liquid.
The present disclosure relates to the technical field of preparation of copper chloride, and in particular to a method of preparing an electronic-grade copper chloride dihydrate, which mainly includes the following steps: dissolving a copper salt in a first hydrochloric acid solution to obtain a copper salt solution; performing two solid-liquid separations for the copper salt solution to obtain a filtrate; wherein, the two solid-liquid separations do not have sequence and include an adhesive separation and a co-precipitation separation; the adhesive separation is a solid-liquid separation performed by adding a waste PCB board powder and continuously stirring; the co-precipitation separation is a solid-liquid separation performed by adding tin chloride compound and continuously stirring; adding a second hydrochloric acid into the filtrate and adjusting pH and then performing evaporation concentration to a supersaturated solution, adding copper chloride seed crystal and then performing cooling crystallization and centrifugal separation.
The present disclosure relates to the field of resource utilization-oriented treatment technologies for wastewater, and more particularly, to a resource utilization-oriented treatment method for a spent electroless nickel plating bath. The method includes oxidation de-complexation, synchronous precipitation of nickel and phosphorus, secondary precipitation of nickel, and resource utilization of sodium salt. In the present disclosure, in a reaction process, no sludge is generated to avoid secondary pollution to the environment. Further, the present disclosure has the advantages of short flow and less chemical use, greatly reducing treatment costs. In this way, this method is a low-cost and clean resource utilization-oriented treatment method capable of achieving resource utilization-oriented recovery of nickel, phosphorus, sodium, sulfate radical, or chlorine in the spent electroless nickel plating bath.
The present invention relates to the technical field of resource utilization of ammonia-nitrogen wastewater, and particularly relates to a system for determining an end point of evaporation by means of image recognition during an ammonia-nitrogen wastewater evaporative crystallization process. The key points of the technical solution of the present invention lie in that the system for determining an end point of evaporation comprises an evaporator, a sampling platform, a data transmission module and an image recognition system, wherein the sampling platform is arranged below an evaporation interface of the evaporator, and is used for collecting crystals falling off the evaporation interface and collecting image information of the crystals; the data transmission module may transmit data from the sampling platform to the image recognition system; and the image recognition system is used for processing the image information of the crystals that are acquired by the sampling platform, so as to determine an end point of evaporative crystallization. By means of the present invention, an end point of evaporative crystallization can be directly and accurately determined, sodium chloride is precipitated to the greatest extent, and the sodium chloride is fully separated from ammonium chloride, such that the product quality is improved, the production efficiency is improved, and the energy consumption is reduced.
The present invention relates to the technical field of batteries, and in particular, to a self-repairing conductive coating modified bipolar current collector, a preparation method therefor, and an application thereof. The method comprises the following steps: preparing a microcapsule containing a repairing agent; preparing a slurry containing the microcapsule, a catalyst, a binder and a conductive filler; and coating the slurry on the surface of a current collector substrate to obtain a self-repairing conductive bipolar current collector having a coating. When the current collector is perforated, the self-repairing microcapsule in the self-repairing conductive coating is broken due to the action of external stress, the repairing agent is released and can be immediately subjected to a polymerization reaction under the action of the catalyst to generate a self-repairing material, and cracks or holes in a current collector layer can be rapidly and accurately repaired by means of the self-repairing material, thereby preventing permeation of the electrolyte, preventing a short circuit inside a battery, and improving the safety of the battery.
A method for preparing high-purity copper sulfate from an acidic copper chloride etching waste liquid, the method comprising: introducing liquid ammonia into a first acidic copper chloride etching liquid and a second acidic copper chloride etching liquid, mixing the obtained solutions, and crystallizing and filtering same to obtain an intermediate basic copper chloride; washing and separating the basic copper chloride, and adding same to a sulfuric acid solution to obtain a copper sulfate slurry; adding water to the copper sulfate slurry, and cooling, crystallizing and separating same to obtain crude copper sulfate; and adding a first solution to the crude copper sulfate, heating same, filtering same while the temperature is controlled, and cooling, crystallizing and centrifuging the obtained first filtrate to obtain high-purity copper sulfate. The method can achieve the resource utilization of copper, sodium, ammonium, and chlorine, etc. in the acidic copper chloride etching waste liquid; and the method has a high product quality and a high utilization rate of the technical process, and is energy-saving, environmentally friendly and very easy for industrialization.
A treatment method for a leachate of a hazardous waste landfill, comprising: adding sodium carbonate into the leachate to obtain calcium carbonate residues and a first waste liquid; adding hydrochloric acid into the first waste liquid to obtain first mixed liquid; heating the first mixed liquid, then introducing quantitative chlorine into the first mixed liquid, and synchronously introducing air to obtain a second waste liquid and a first mixed gas; introducing the first mixed gas into an alkali liquor absorption tower; heating the second waste liquid to obtain evaporated condensate water and a concentrated liquid; performing centrifugal separation on the concentrated liquid to obtain a sodium chloride wet salt and a centrifugal separation liquid; pumping the centrifugal separation liquid into a cooling crystallization tank, and performing centrifugal separation to obtain a potassium chloride wet salt and a final mother liquid; and returning the final mother liquid to the first waste liquid or the second waste liquid for recycling. The method greatly reduces the difficulty of subsequent salt separation treatment, avoids corrosion of subsequent hydrogen bromide to evaporator equipment, and achieves resource recycling of sodium chloride and potassium chloride.
A method for preparing a basic copper carbonate is provided. The method includes: mixing a copper hydroxide with water to obtain a precursor slurry; adding an accelerator to the precursor slurry and mixing the two to obtain a first mixture; introducing gaseous carbon dioxide into the first mixture for reaction whereby obtaining a crude basic copper carbonate; and purifying the crude basic copper carbonate whereby obtaining the basic copper carbonate. The accelerator is at least one selected from the group consisting of an ammonia water and an ammonium salt.
A preparation method for electronic-grade copper chloride dihydrate, which belongs to the technical field of preparation of copper chloride. The preparation method comprises the following steps: dissolving a copper salt in a first hydrochloric acid solution to obtain a copper salt solution; carrying out solid-liquid separation twice on the copper salt solution to obtain a filtrate, wherein the two solid-liquid separations are in no order and comprise adhesion separation and coprecipitation separation, the adhesion separation involves adding a waste PCB plate powder and continuously stirring same followed by solid-liquid separation, and the coprecipitation separation involves adding a tin chloride compound and continuously stirring same followed by solid-liquid separation; and adding a second hydrochloric acid to the filtrate to adjust the pH value, then evaporating and concentrating same until same becomes a supersaturated solution, adding copper chloride seed crystals, cooling and crystallizing same, and subjecting same to centrifugal separation to obtain an electronic-grade copper chloride dihydrate product. The preparation process is simple in terms of operation, low in cost, produces a small amount of environmental pollution and is suitable for industrialization.
The present invention relates to the technical field of wastewater resource treatment, and more particularly, to a method for resource treatment of a chemical nickel-plating waste liquid. The method comprises the steps of: oxidation complex-breaking, nickel-phosphorus synchronous precipitation, nickel secondary precipitation, and sodium salt recycling. According to the present invention, no sludge is generated in a reaction process, secondary pollution of the environment can be prevented, the technological process is short, the use amount of the medicament is small, the treatment cost is greatly reduced, the resource recycling of nickel, phosphorus, sodium, sulfate or chlorine in the chemical nickel-plating waste liquid is achieved, and the method is a low-cost and clean resource treatment method.
C23C 18/16 - Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coatingContact plating by reduction or substitution, i.e. electroless plating
C02F 103/16 - Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
Provided is a recycling method for a high-salt salty mud containing sodium chloride and sodium sulfate. The method comprises: sequentially carrying out a Fenton-like treatment and a chlorine dioxide treatment to oxidize a salty mud solution in two stages, and then replacing the sodium salt with an ammonium salt to prepare sodium carbonate and a mixed ammonium salt. According to the method, a multi-stage oxidation treatment is adopted, components containing sodium chloride, sodium sulfate, etc. are effectively utilized, organic matter and heavy metals in the high-salt salty mud are fundamentally removed, recycling of the salty mud is realized, the landfill disposal costs are saved, good economic benefits are generated, and good environmental benefits are also generated.
Provided is a method for preparing basic copper carbonate. The method comprises: mixing copper hydroxide with water to obtain a precursor slurry; adding an accelerator to the precursor slurry, and mixing same to obtain a first mixture; introducing carbon dioxide gas into the first mixture for a reaction to obtain a crude basic copper carbonate product; and subjecting the crude basic copper carbonate product to a purification treatment to obtain basic copper carbonate, wherein the accelerator is selected from at least one of aqueous ammonia and an ammonium salt. The raw materials for the preparation method are readily available. Without introducing impurity ions during the reaction, basic copper carbonate with a high purity, a controllable and uniform size, and a stable quality can be prepared. The preparation method has a rapid speed, a high efficiency and controllable conditions, meets requirements for being energy-saving and environmentally friendly, has low equipment requirements, and is advantageous for industrial production.
The present invention relates to a method for preparing basic zinc chloride, comprising the following steps: A: preparing raw materials: preparing zinc chloride solution, ammonia water and an induction system; B: performing synthesis: adding the zinc chloride solution and the ammonia water into the induction system in a parallel flow manner, and controlling the temperature to be 60.0-90.0° C.; after the feeding is finished, continuing to react for 20.0-40.0 minutes; and C: performing filtration, washing and drying: after filtering and washing the synthesized basic zinc chloride, drying the basic zinc chloride for 4.0-8.0 hours at 80-105° C. to obtain the basic zinc chloride product. Compared with the prior art, the method for preparing basic zinc chloride has such advantages as simple process, low impurity content, easy-to-control product quality, and suitability for industrialization.
A method for preparing basic zinc chloride comprises the following steps: A, preparing raw materials, namely a zinc chloride solution, ammonia water and an induction system; B, synthesizing, that is, adding the zinc chloride solution and the ammonia water into the induction system in a manner of cocurrent flow and controlling the temperature within 60.0°C to 90.0°C; and after the materials are added, continuously reacting for 20.0 minutes to 40.0 minutes; and C, filtering, washing and drying, that is, filtering the synthesized basic zinc chloride, washing and drying at 80°C to 105°C for 4.0 hours to 8.0 hours to obtain the product basic zinc chloride. Compared with the prior art, the method has the advantages that the process is simple, the impurity content is low, the product quality is easily controlled and the method is suitable for industrialization.
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