42 results about "Nickel sulphate" patented technology

The application provides a method for preparing copper sulfate by using a nickel sulfate production device, and comprises the following steps: S1, raw material pretreatment; S2, leaching reaction; S3, solution purification; S4, evaporation and concentration; S5, crystallization; S6, filtration separation; and S7, drying. The application relies on the existing evaporation, precooling, filter pressing and crystallization equipment of the nickel sulfate, realizes the production of qualified copper sulfate without adding new core equipment through raw material adaptive treatment and process parameter adjustment, has the advantages of low cost, high adaptability, environmental protection and high efficiency, the purity of the product is greater than or equal to 20%, the equipment utilization rate is increased by more than 60%, and the method is suitable for joint production operation of non-ferrous metal smelting enterprises. In the crystallization step, the crystallizer is provided with a crystallization degree monitoring device, the cooling rate and the constant-temperature crystallization time can be adjusted in real time according to the supersaturation degree and other parameters of the solution, good conditions are provided for the growth of the copper sulfate crystals, the crystal particle size is uniform, the purity and quality of the product are improved, and the quality requirements of different customers for the copper sulfate product are met.

This invention discloses a method for preparing battery-grade nickel sulfate and iron phosphate using nickel pig iron and ferric phosphate slag as raw materials. The preparation process involves first mixing the ferric phosphate slag with cationic alkyl polyacrylamide to form a uniform mixture. This mixture is then added to dilute acid and stirred to disperse it. Nickel pig iron powder is added, and the mixture is filtered to obtain a leaching solution. The leaching solution is then subjected to nickel-iron separation using resin to obtain an iron-containing solution and a nickel-containing resin. The nickel-containing resin is desorbed to obtain a desorbed solution. A nickel-based pH adjuster is added to this desorbed solution, and the solution is filtered to obtain a nickel sulfate solution. After evaporation and concentration to precipitate crystals, the solution is dried and crushed to obtain battery-grade nickel sulfate. Hydrogen peroxide is added to the iron-containing solution to oxidize ferrous iron to ferric iron. A phosphorus source is added, the pH is adjusted, and the solution is reacted, filtered, and dried to obtain iron phosphate dihydrate. This is then calcined to obtain battery-grade iron phosphate. This invention uses nickel pig iron and ferrophosphate slag as raw materials, and utilizes the ferrophosphate slag to promote the full leaching of iron from nickel pig iron, and nickel pig iron to promote the leaching of phosphate and iron from ferrophosphate. With the addition of cationic alkyl polyacrylamide, it achieves high leaching rates of iron and nickel in a short time, and simultaneously achieves the separation of non-ferrous and nickel metal ions during the acid leaching process, so as to finally obtain high-purity, qualified battery-grade nickel sulfate and ferrophosphate.

This invention discloses a method for low-resistivity thin-film deposition, comprising the following steps: Step 1, the ceramic substrate is first pickled with 2% hydrochloric acid for 1-2 hours. After pickling, it undergoes initial treatment and activation to obtain an activated ceramic substrate; Step 2, preparation of the nickel plating solution: 7-12 g / L nickel sulfate, 15 g / L sodium tungstate, 31.5 g / L sodium hypophosphite, 35 g / L sodium citrate, 2 ml / L ammonia, and 5 g / L thiourea are stirred and mixed thoroughly to obtain the nickel plating solution. This invention enhances the contact effect between the activation solution and the substrate through the synergistic effect of the raw materials, thereby improving the performance of the product. Simultaneously, tungsten metal in the electroplating process possesses characteristics such as high temperature resistance, corrosion resistance, low temperature coefficient of resistance (TCR), and good thermal stability. Furthermore, the synergistic effect of the raw materials significantly improves the product's performance.

The application relates to a tungsten alloy material wire cutting technical field, in particular to a preparation method of a high-strength tungsten wire composite material for cutting. The preparation method of the high-strength tungsten wire composite material for cutting comprises the following steps: preparing a base tungsten wire, preparing surface plated diamond, preparing modified plated diamond and preparing the high-strength tungsten wire composite material. In the application, the diamond micro powder is pretreated and activated, then is added into a plating solution of nickel sulfate, sodium molybdate and sodium hypophosphite dihydrogen, and is chemically plated to prepare a Ni-Mo-P plating layer on the surface of the diamond, and after the surface plated diamond is obtained, when the diamond is embedded into the base tungsten wire, a mechanical interlocking structure can be formed between the diamond and the base tungsten wire to resist the shearing stress during cutting, therefore, the preparation of the Ni-Mo-P plating layer on the surface of the diamond can effectively improve the bonding force between the diamond and the base tungsten wire and reduce the falling amount of the diamond during cutting.

The application belongs to the technical field of battery material recycling, and particularly discloses a battery black powder recycling method. The battery black powder recycling method provided by the application comprises the following steps: obtaining lithium-containing leaching liquor and leaching residue by pressurized acid leaching of battery black powder; performing acid leaching reaction on the leaching residue to obtain nickel-, cobalt- and manganese-containing leaching liquor; adding an oxidizing agent to the nickel-, cobalt- and manganese-containing leaching liquor, adjusting the pH by using alkali to remove iron and aluminum, and filtering to obtain a post-iron-and-aluminum-removal liquid; extracting Ca by using HBL120 extractant to obtain Co-, Ni- and Mn-containing raffinate; extracting Mn by using P204 extractant to obtain Mn-loaded organic phase and Co- and Ni-containing raffinate; extracting Co by using Cy272 extractant to obtain Co-loaded organic phase and Ni-containing raffinate; and removing F and P from the Ni-containing raffinate to obtain a nickel sulfate solution. The application has high lithium extraction rate and shortens the process flow of manganese recycling.

The present application relates to a kind of methods for deep oil removal of nickel sulfate solution resin, comprising the following steps: S1 oil removal resin pretreatment: select modified polystyrene-divinylbenzene macroporous adsorption resin as oil removal resin, and sequentially carry out acid dipping, deionized water washing, obtain pretreatment oil removal resin;S2 nickel sulfate solution pretreatment: the nickel sulfate solution to be treated is filtered by precision filter;S3 resin column deep oil removal: the obtained filtrate is imported into the fixed bed resin column loaded with pretreatment oil removal resin and is adsorbed;S4 hot water regeneration of oil removal resin: 80~90 ℃ deionized water is used as regenerant to reverse flush saturated resin column, and the oil-containing hot water generated during regeneration is collected as regeneration waste liquid;After regeneration, the resin column is washed with 30~40 ℃ deionized water until the adsorption capacity is restored;S5 regeneration waste liquid treatment: regeneration waste liquid is separated by oil and water, and the water phase is recycled after cooling. The present application not only ensures the depth of oil removal, but also realizes the green process and low-cost operation.

The utility model provides a set of nickel sulfate drying system for battery, and the feeding platform is put into raw material from the feed inlet of the stock bin, the stock bin is the bucket shape, concentrates to the feeding of the unloading valve, and the sulfurization bed dryer dries the raw material, and the material fluidization is promoted by mechanical vibration in the process, and the raw material after fluidization passes through the iron remover, and the metal impurities are removed, and the iron in the raw material is guaranteed to be not higher than 0.001%, the magnetic foreign matter (MI) content is small higher than 0.00001%, and the raw material after the iron removal is conveyed to the feeding end of the vibrating screen through the conveying device, the vibrating screen sieves different granularity materials through multilayer different mesh screen, and the next step deep processing is carried out according to the granularity, the raw material with the granularity between 8 mesh-20 mesh obtained through the first unloading port and the second unloading port is used as the product, the raw material with the granularity between 20-32 mesh obtained through the third unloading port is used as the crystal seed, and the raw material with the granularity below 32 mesh obtained through the fourth unloading port is used as the fabric, and the storage device is arranged in each unloading port.

This invention discloses a process for separating and removing impurities from a nickel sulfate solution. The process steps are as follows: 1) The extractant solution is mixed with cyclohexenoic acid and dithiophosphonic acid, and then reacted with liquid alkali for saponification to obtain a post-saponification organic phase; 2) The crude nickel sulfate solution and the post-saponification organic phase are subjected to a single-stage multi-stage countercurrent total extraction to obtain a raffinate aqueous phase and a fully extracted loaded organic phase; 3) The fully extracted loaded organic phase and the crude nickel sulfate solution are subjected to a two-stage multi-stage countercurrent extraction to remove impurities, resulting in a purified nickel sulfate solution and an organic phase loaded with impurities. This invention effectively reduces the oxidative degradation of the extractant during use by adding cyclohexenoic acid and dithiophosphonic acid as auxiliaries, thereby reducing the TOC and small molecule acid content in the raffinate / back-extraction solution from the source, lowering subsequent processing costs, and simultaneously improving the separation coefficient between impurity metals and nickel. This achieves the effect of efficiently separating impurity metals even when the extractant is already loaded with the target metal.

The present disclosure relates to a hydrometallurgical recovery method for nickel sulfate. More specifically, the present disclosure relates to a hydrometallurgical nickel sulfate recovery method in which a wet smelting process is used to extract a high-purity nickel sulfate aqueous solution from a raw material containing nickel (Ni), cobalt (Co), and manganese (Mn). In the method, sodium hydroxide or sodium carbonate is not used as a neutralizer but nickel hydroxide is used, which prevents salts of impurities from being generated as a precipitate in a solvent extraction process, thereby increasing process efficiency of the solvent extraction process.

This invention belongs to the field of hydrometallurgical technology, and specifically relates to a method for the tiered directional separation of copper, nickel, and iron from nickel leaching tailings. This method targets high-copper and high-nickel nickel leaching tailings. First, the tailings are activated at room temperature with an acidic nickel-containing solution within the nickel smelting system. Then, pressure leaching is performed to achieve highly selective nickel leaching, yielding high-grade copper slag and a leachate containing nickel and iron. Finally, the leachate is subjected to pressure iron removal to obtain iron concentrate and a pure nickel sulfate solution. This invention overcomes the shortcomings of existing technologies in handling high-nickel materials through a unique three-stage process of "activation treatment – ​​selective nickel leaching – pressure iron removal," achieving efficient separation and full resource recovery of copper, nickel, and iron. Furthermore, the process is closely coupled with the main smelting system, resulting in low cost and environmental friendliness.

The present application relates to a kind of vacuum evaporation instead of the method of electric evaporation nickel removal, which refers to the liquid after copper removal is concentrated using vacuum evaporation kettle under the condition that vacuum degree is-50~‑65KPa, temperature is 65~80℃, vacuum evaporation flow is 1.5~2.5m 3 / h, namely the vacuum evaporation liquid with specific gravity≥1.43 is obtained;The vacuum evaporation liquid is pre-cooled by plate condenser first, then is sequentially operated by refrigeration crystallization machine and belt filter, respectively, to obtain crude nickel sulfate and crystallization mother liquor, and the crystallization mother liquor is returned to electrolysis system.The present application has low power consumption, large solution processing capacity, good solution concentration effect, simple operation, safe and environmentally friendly operation environment, and the quality of crude nickel sulfate product prepared is stable.

This invention belongs to the field of electroplating solution preparation technology, and relates to a corrosion-resistant petroleum pipe electroplating solution and its preparation method. The corrosion-resistant petroleum pipe electroplating solution includes nickel sulfate, nickel chloride, sodium molybdate, cerium nitrate, composite complexing agent, nano-functional additives, leveling agent, dispersant, and deionized water. The nano-functional additives are composed of polydopamine-coated MoSe2 nanosheets and silane coupling agent-modified nano-silica, which refines the grain size, increases the density of the coating, and thus improves the corrosion resistance of the coating. A composite complexing agent system is used to form a stepped coordination, allowing complexing agents with different coordination strengths to preferentially complex different metal ions, ensuring the co-deposition of metal ions, reducing residual stress in the coating, and preventing the formation of microcracks.

This invention provides a process for removing thallium from nickel sulfate solution, belonging to the field of nickel-cobalt hydrometallurgical technology. It solves the problems of low efficiency, unsatisfactory results, and insufficient removal depth in existing extraction processes for thallium removal from nickel sulfate solution, which fail to meet environmental protection requirements. The invention includes the following steps: saponifying a P204 extractant with a nickel sulfate solution; then adding a thallium-containing nickel sulfate solution for extraction and impurity removal; adding a C272 extractant to the first thallium-containing nickel sulfate solution for countercurrent extraction and impurity removal; adding 6-10 times the concentration of sodium sulfide according to the remaining thallium content in the second removal solution, followed by stirring, precipitation, and filtration; heating the third thallium-containing nickel sulfate solution, and then using a C-100E cation exchange resin for thallium adsorption to obtain the final thallium-removed nickel sulfate solution. This invention achieves stable control of the thallium content in the nickel sulfate solution, and the process adopts a step-by-step approach to increase the impurity removal depth, ultimately achieving deep thallium removal from the nickel sulfate solution.

The application discloses a method for preferentially extracting lithium from waste lithium ion battery waste materials. First, the waste lithium ion battery waste materials are mixed with composite salt to obtain a mixture, and high-temperature roasting is performed to obtain a roasted clinker. The roasted clinker is leached to obtain a lithium-containing leaching solution and a leaching residue. The leaching residue is subjected to acid leaching, impurity removal and extraction treatment to obtain a nickel sulfate solution and a cobalt sulfate solution. Compared with the prior art, the application uses solid sulfate and calcium-containing substances to replace liquid strong acid, realizes preferential extraction of lithium during roasting, and only needs water leaching to obtain a high-purity lithium-rich solution, thereby realizing efficient separation of lithium and other metals from the source, simplifying the subsequent separation and purification process, and producing leaching residues rich in valuable metals such as nickel and cobalt, which can be used as high-quality metallurgical raw materials, realizing high-value utilization of all components, and having significant industrial application value and economy.

The application discloses a method for recovering multiple metals from waste lithium batteries, comprising the following steps: S1. mixing waste lithium battery black powder with a magnesium-containing chlorinating agent, and performing roasting treatment to obtain a roasting product; S2. mixing the roasting product with a weak alkaline leaching agent, and performing leaching treatment, and after filtration, a lithium-containing solution and a filter residue are obtained; S3. adding an ammonia-carbonate-sulfite composite leaching agent to the filter residue to perform ammonia leaching treatment, and after filtration, a nickel-cobalt-rich ammonia complex leaching solution and a manganese-rich solid residue are obtained; S4. sequentially performing heating and extraction treatment on the nickel-cobalt-rich ammonia complex leaching solution, and nickel sulfate and cobalt sulfate are obtained; performing dissolution and precipitation treatment on the manganese-rich solid residue, and a manganese salt is obtained; through the synergistic coupling of magnesium chloride roasting and composite ammonia leaching, lithium is preferentially extracted, and the pre-activation of transition metal phases is realized, so that the inherent contradiction that lithium efficient extraction and nickel-cobalt efficient leaching cannot be achieved simultaneously in the existing process is successfully resolved.

The application belongs to the technical field of composite materials, and discloses a preparation method of nickel-coated graphene and application of the nickel-coated graphene in aluminum-based composite materials. The preparation method comprises the following steps: obtaining graphene nanosheets by pretreating natural graphite; forming a nickel catalytic seed layer through stannous chloride sensitization and sodium borohydride activation; and performing chemical plating in a plating solution containing nickel sulfate hexahydrate, sodium citrate, ammonium chloride and sodium hypophosphite monohydrate to obtain nickel-coated graphene with a 3-10 nm continuous nickel shell layer on the surface. The nickel-coated graphene is mixed with aluminum-silicon-magnesium alloy powder and ball milled, and then subjected to low-temperature reaction at 350-450 DEG C to generate Al3Ni phase, high-temperature hot pressing densification at 600-650 DEG C to obtain aluminum-based composite materials. The method can effectively control Al-C interface reaction, inhibit the generation of Al4C3, improve the mechanical properties and electrical conductivity of the composite materials, and is suitable for large-scale application.

The application belongs to the field of electrochemical energy storage, and discloses a nickel-sulfur-selenium compound / nitrogen-doped carbon composite material, a preparation method thereof and an energy storage device. The preparation method comprises the following steps: dissolving nickel ammonium sulfate, citric acid and sodium chloride in water to obtain a mixed solution, and then evaporating the mixed solution to obtain a solid precursor; the mass ratio of nickel ammonium sulfate, citric acid and sodium chloride is 1:(0.8-1.2):(8-15); the solid precursor is placed in a reducing atmosphere, calcined at 500-800 DEG C for 2-4 h to obtain a triniickel disulfide / nickel / nitrogen-doped carbon composite material; the triniickel disulfide / nickel / nitrogen-doped carbon composite material is uniformly mixed with selenium powder, and then placed in an inert atmosphere, calcined at 400-500 DEG C for 2-4 h to obtain the final nickel-sulfur-selenium compound / nitrogen-doped carbon composite material; the mass ratio of the triniickel disulfide / nickel / nitrogen-doped carbon composite material and the selenium powder is 1:(2-5). The application can improve the stability of the potassium ion hybrid capacitor electrode material.

The present application relates to the technical field of non-ferrous metal metallurgy, and provides a method for treating a nickel sulfate solution. The method for treating the nickel sulfate solution provided in the present application comprises a neutralization step, an extraction and deoiling step, an electrowinning step, and a nickel precipitation step. In the neutralization step, a nickel precipitation material generated by precipitation of an anolyte in the nickel precipitation step is used as a neutralizing agent to adjust the pH value. The neutralized and impurity-removed solution is subjected to extraction, deoiling, and electrowinning to obtain the anolyte, and the anolyte is then subjected to precipitation to obtain the nickel precipitation material.

This invention provides an oxygen pressure leaching system, relating to the field of nickel hydrometallurgical technology. A connecting main pipe connects the solid-liquid separation mechanism and the discharge pipeline. The supernatant separated in the solid-liquid separation mechanism can enter the discharge pipeline through the connecting main pipe. Since the temperature of the supernatant is lower than the temperature of the material in the discharge pipeline, the supernatant entering the discharge pipeline effectively reduces the temperature of the discharge pipeline, thereby preventing the material temperature in the discharge pipeline from becoming too high and causing a large amount of nickel sulfate to precipitate in the form of crystals within the discharge pipeline. This increases the reaction temperature of the reactor, thereby reducing the reaction time and alleviating the technical problems of the existing oxygen pressure leaching process being too long, and the increased leaching temperature causing a large amount of nickel sulfate to precipitate in the form of crystals within the discharge pipeline, leading to premature flash evaporation.

This invention provides a nickel sulfate and sulfuric acid recovery device. The first inlet of a pretreatment component is connected to the first outlet of a raw material storage tank; the first inlet of a first nanofiltration component is connected to the first outlet of the pretreatment component; the first inlet of a cooler is connected to the first outlet of the first nanofiltration component; the first inlet of a primary cooling crystallizer is connected to the first outlet of the cooler; the first inlet of a secondary cooling crystallizer is connected to the first outlet of the primary cooling crystallizer; the first inlet of a solid-liquid separator is connected to the first outlet of the secondary cooling crystallizer; the first inlet of a second nanofiltration component is connected to the first outlet of the solid-liquid separator; and the first inlet of a third nanofiltration component is connected to the first outlet of the second nanofiltration component, with its first outlet connected to the second inlet of the raw material storage tank. Compared with traditional evaporation and concentration devices, this invention produces nickel sulfate with lower operating costs, better crystal quality, and higher purity.

The application discloses a preparation method of a bifunctional electrode, the electrode and application, wherein the preparation method comprises the following steps: (1) electroplating solution configuration: taking deionized water as a solvent, sequentially adding nickel sulfate, ammonium sulfate, ammonium chloride and sodium thiosulfate, uniformly stirring, and then adjusting the pH value to 4.5-5.5; (2) electrode pretreatment: taking a nickel wire mesh with double-sided sand blasting as a cathode, and then sequentially removing oil and an oxide layer; and (3) electrochemical deposition: placing the pretreated cathode and a nickel-based tensile mesh anode into the electroplating solution, connecting the cathode and the anode with a power supply negative pole and a positive pole respectively, depositing at a current density of 5-20 mA / cm 2 at room temperature for 30-90 min under constant current, and obtaining the bifunctional electrode. The NiS alloy is prepared by optimizing an electroplating co-deposition process, the dual anti-iron mechanism of a polysulfide protective layer is utilized, the unification of high electrochemical activity and anti-iron adsorption performance is realized, the energy consumption of an electrolytic cell is reduced, and the operation life is prolonged.

The invention belongs to the technical field of cobalt hydrometallurgy, and particularly relates to a method for preparing high-purity cobalt from crude cobalt hydroxide, which comprises the following steps of: performing size mixing on the crude cobalt hydroxide, and performing selective reduction leaching through concentrated sulfuric acid and sulfur dioxide to obtain cobalt leachate and manganese slag; sodium bicarbonate is adopted to adjust the pH of the cobalt leaching solution for segmented precipitation and filtration, and after impurities are removed, a nickel-containing cobalt sulfate solution is obtained; the solution is introduced into nickel removal resin subjected to qualified cobalt sulfate pre-saturation treatment for adsorption and elution separation, cobalt-containing effluent is combined, and high-purity cobalt sulfate is obtained; and finally, carrying out electrodeposition by taking the cobalt plate as an electrolyte solution to obtain the high-purity cobalt plate. According to the method, the processes of selective reduction leaching, sodium bicarbonate segmented precipitation, cobalt pre-saturation, resin adsorption nickel removal and cobalt electrodeposition are adopted, the method has the advantages of being short in technological process, easy to operate and low in cost, the prepared cobalt plate product is high in purity, and nickel sulfate is recycled.

The utility model relates to the technical field of sampler, concretely is a kind of nickel sulfate solution sampler, including sampling cylinder, the bottom of sampling cylinder is fixedly connected with plug-in connector, the transmission case of sampling cylinder, the inside of transmission case is equipped with opening and closing mechanism, the right side upper portion of sampling cylinder is fixedly connected with suction cylinder, the inside of suction cylinder is equipped with suction mechanism, the left side upper portion of sampling cylinder is fixedly connected with handle, the right side of the upper portion of handle is fixedly connected with controller. The utility model has realized the opening and closing of sampling cylinder bottom and the suction of solution, has improved the sealing and accuracy of device.

The application discloses a kind of chemical plating black nickel concentrated solution, including concentrated solution A, concentrated solution B and concentrated solution C, concentrated solution A includes nickel sulfate, stannous sulfate, zinc sulfate, sodium hypophosphite, sodium citrate, sodium acetate, sodium lactate, sulfur-containing amino acid, stabilizer, ammonia and deionized water, concentrated solution B includes sodium hypophosphite, zinc sulfate, sodium acetate, sodium lactate, stabilizer and deionized water, concentrated solution C includes nickel sulfate, stannous sulfate, sodium citrate, sulfur-containing amino acid, ammonia and deionized water.The application also discloses its preparation method, plating method and application.The black nickel layer prepared from the chemical plating black nickel concentrated solution of the application not only has excellent blackening effect and luster, but also has excellent wear resistance, corrosion resistance and bonding force when directly contacting with metal substrate.The chemical plating bath has long service life and self-regulating control of pH value by continuous supplementing, and the plating speed is stable during the whole plating process.

This invention provides a chemical oil removal device for raffinate, comprising an oil removal tank, above which are connected nickel sulfate solution and steam pipelines. A level gauge and a mixer are located at the top of the oil removal tank. A first sodium persulfate preparation tank and a second sodium persulfate preparation tank are connected to the side of the mixer. The first sodium persulfate preparation tank is equipped with a first sodium persulfate delivery pump, and the second sodium persulfate preparation tank is equipped with a second sodium persulfate delivery pump. The mixer is connected to the oil removal tank, the nickel sulfate solution pipeline, the first sodium persulfate delivery pump, and the second sodium persulfate delivery pump. This invention can adjust the valve to control the flow rate according to the oil content of the system, achieving satisfactory oil removal while maximizing reagent mixing and improving reagent utilization efficiency, thereby reducing system production costs. It is easy to operate and highly practical.

This invention discloses a high-phosphorus amorphous electroless nickel plating process and solution, relating to the field of electroless nickel plating technology. It primarily addresses the technical problem of simultaneously achieving stability of the plating solution and corrosion resistance of the coating in existing technologies. The plating solution uses nickel sulfate as the main salt and sodium hypophosphite as the reducing agent, combined with a complexing system of ternary organic acids, and an environmentally friendly composite stabilizer composed of organic components and rare earth cerium or lanthanum salts. The pH of the plating solution is controlled by a pH adjuster. Before plating, the plating solution undergoes precise continuous filtration, and the substrate is pre-immersed in dilute lactic acid. The plating process employs a combination of air agitation and workpiece movement, along with optimized substrate pretreatment and plating procedures. This invention enables long-term stable operation of the plating solution without the need for heavy metal stabilizers, and can controllably produce amorphous nickel-phosphorus alloy coatings with high corrosion resistance and strong adhesion. It can be widely applied to surface protective coating treatment of various metal substrates.

The application provides a method for co-production of battery-grade nickel sulfate and battery-grade iron phosphate, comprising the following steps: 1) performing first acid leaching treatment on a nickel-iron alloy pair by using an acid liquor to obtain a first acid leaching liquor and a first acid leaching residue; 2) performing second acid leaching treatment on the first acid leaching residue by using an oxidizing agent and an acid liquor to obtain a second acid leaching liquor and a second acid leaching residue; 3) performing extraction treatment on a mixed liquor comprising the first acid leaching liquor and the second acid leaching liquor by using an ion exchange resin to obtain a raffinate comprising ferrous ions; performing oxidation treatment on a system comprising the raffinate and a phosphorus source to obtain iron phosphate; 4) performing cleaning treatment on the ion exchange resin after the extraction treatment by using an acid liquor, then performing stripping treatment on the ion exchange resin by using an acid liquor and performing cooling crystallization treatment on a stripping liquor comprising nickel ions to obtain nickel sulfate. The method provided by the application has high nickel leaching rate and iron leaching rate, the prepared nickel sulfate and iron phosphate have high purity, and the process flow is simple.

This utility model discloses a device for separating wastewater and organic phase in a nickel sulfate production system. The device includes a storage tank with a drain pipe fixed to the bottom of one side and an empty pipe fixed to the bottom of the other side. Handles are located on both sides of the tank. A water inlet pipe is fixed to the top of a sealing cap. A sealing cap is located at the top of the tank. An overflow pipe is fixed to the other side of the tank. A cleaning assembly is installed inside the tank. This utility model uses an electric telescopic rod to raise and lower a cleaning scraper ring. The raising and lowering of the cleaning scraper ring scrapes away residual dirt on the inner wall of the storage tank, thus cleaning the inner wall. A rotating drive gear drives a toothed groove to rotate a cleaning scraper blade, causing the scraper blade to move on the cleaning scraper ring, scraping away the dirt scraped off the surface of the cleaning scraper ring. The scraped dirt is then discharged through the overflow pipe, ensuring the cleaning effect of the cleaning scraper ring.

The application relates to the technical field of brush plating liquid preparation, in particular to a brush plating liquid for processing a gold-finger gold plating layer of a PCB and a preparation process thereof. The brush plating liquid comprises a nickel plating liquid and a gold plating liquid. The nickel plating liquid comprises nickel sulfate, acetic acid, deionized water and modified porous SiC-nano nickel particles. The gold plating liquid comprises potassium cyanide, potassium citrate, deionized water and wrapped porous SiC-nano silver particles. Through the process of nickel plating first and then gold plating, an effective physical barrier layer between copper and gold is formed by the nickel layer, which fundamentally prevents the mutual diffusion of copper and gold during high-temperature or long-term power use, and solves the problem of gold brittleness. The porous SiC preferentially bears the friction load, greatly reduces the wear rate of the plating layer, the modified porous SiC-nano nickel particles fill the micropores of the nickel layer, the wrapped porous SiC-nano silver particles fill the micropores of the gold plating layer, the double-layer plating layer structure is more compact, the corrosion resistance of the plating layer is improved, and the wrapped porous SiC-nano silver particles also effectively reduce the temperature rise and improve the current resistance of the gold finger.