30 results about "Cobaltous sulfate" patented technology

The invention belongs to the technical field of magnesium-zinc magnesium alloy surface treatment, and particularly relates to a method for in-situ growth of different blue ceramic film layers on the surface of a magnesium-zinc magnesium alloy. Comprising the following steps that the surface of a magnesium-zinc magnesium alloy sample is polished and cleaned, and then the surface of the sample is sequentially subjected to primary alkali washing, primary water washing, primary acid pickling, secondary water washing, secondary acid pickling, tertiary water washing and secondary alkali washing, so that the pretreated magnesium alloy is obtained; the pretreated magnesium alloy is placed in electrolyte for micro-arc oxidation treatment, and a blue ceramic film layer is generated on the surface of the magnesium alloy in situ; the electrolyte is formed by adding potassium fluotitanate and cobaltous sulfate into a silicate and phosphate composite electrolyte system; or the electrolyte is obtained by adding potassium fluotitanate into a phosphate electrolyte system. Different blue ceramic film layers are prepared, the ornamental value of the magnesium-zinc magnesium alloy component can be improved, and the visual effect is improved.

The invention relates to the field of recycling of lithium ion batteries, and discloses a method for recycling valuable metals in a failed lithium battery. The method comprises the following steps: (1) carrying out reaction on the nickel-cobalt-manganese slag and concentrated sulfuric acid, carrying out water leaching on the obtained slurry, and carrying out solid-liquid separation to obtain a cobalt-manganese leaching solution and nickel slag; (2) extracting the cobalt-manganese leachate, carrying out reverse extraction on the obtained organic phase to obtain a manganese sulfate solution, and then carrying out evaporative crystallization to obtain manganese sulfate; the extracted raffinate is subjected to evaporative crystallization, and cobaltous sulfate is obtained; and (3) the nickel slag obtained in the step (1), an acid solution and hydrogen peroxide are subjected to a catalytic oxidation reaction, an obtained nickel sulfate solution is subjected to electro-deposition treatment, and nickel is obtained. According to the method, the recovery rate and purity of the valuable metal are improved, the recovery process of the valuable metal of the lithium battery is simplified, the whole process is environmentally friendly, near-zero discharge of wastewater is achieved, and the investment cost is low.

The utility model discloses a cobaltous sulfate solution impurity removal recovery device which comprises a treatment box, filter screens are arranged on the two sides of the central axis in the treatment box in a covering mode, the filter screens divide an inner cavity of the treatment box into three cavity sections, the area, away from the face, of the two filter screens is a filter cavity, and the area between the two filter screens is a purification cavity. A water inlet cabin communicated with the filter cavity is arranged at the top of the treatment box, a hollow plate parallel to the filter screen is arranged in the middle of the purification cavity, a plurality of high-pressure scattering spray heads are arranged on the two sides, facing the filter screen, of the hollow plate respectively, and impurities are rapidly separated from meshes of the filter screen under reverse washing and high-pressure pushing; according to the cobalt sulfate solution impurity removal and recovery device, the cleaning sewage is gathered in the filter cavity, and the sewage and impurities are discharged by opening the blow-down valve, so that the problems that the filter screen of the existing cobalt sulfate solution impurity removal and recovery device is often blocked, and the time consumption and the labor cost caused by manual cleaning are effectively solved, and the cobalt sulfate solution impurity removal and recovery efficiency is further improved.

The invention relates to a Fenton-like system for regulating and controlling a Co-N microenvironment based on sulfur (S) and application of the Fenton-like system in efficient degradation of antibiotics. Cobalt sulfate (CoSO4) and cobalt nitrate (Co (NO3) 2) are used as raw materials, and the S-doped Co-N-based catalyst is prepared through high-temperature calcination (100-1200 DEG C). According to the catalyst, the Co-N microenvironment is regulated and controlled through S, the electronic structure and surface active site distribution of the catalyst are optimized, and the synergistic effect of double active sites (Co and N) is achieved. In the Fenton-like reaction, the catalyst can efficiently activate peroxymonosulfate (PMS) to generate various high-activity species (such as < 1 > O2 and high-valence metal), and the degradation efficiency of pollutants is remarkably improved. The catalyst shows excellent degradation performance on tetracycline in a wide pH range (pH 5-9), and the degradation efficiency is remarkably higher than that of a traditional Fenton system. In addition, the catalyst has good stability and reusability, and can still maintain high catalytic activity after being recycled. The S-regulated Co-N microenvironment catalyst and the Fenton-like system thereof provided by the invention have the advantages of simple preparation, mild reaction conditions, high degradation efficiency and the like, can be widely applied to the fields of sewage treatment, industrial wastewater treatment and the like, and provide a new solution for efficient treatment of antibiotic pollution in a water body.

The invention provides a method for removing phosphorus from a cobalt sulfate solution. The method comprises the following steps: providing a cobaltous sulfate solution to be treated; the method comprises the following steps: mixing a to-be-treated cobaltous sulfate solution, a composite polymer soluble ferric salt and a coagulant aid, carrying out precipitation reaction, and separating to obtain phosphorus-containing slag and cobaltous sulfate primary purified liquid; a deep phosphorus removal adsorbent is adopted to adsorb trace phosphorus in the cobalt sulfate primary purification liquid, then trace iron in the cobalt sulfate primary purification liquid generates precipitates in an oxygen-containing atmosphere, and after separation, a cobalt sulfate secondary purification liquid is obtained. According to the method, firstly, the synergistic effect of the composite polymer soluble ferric salt and the coagulant aid is adopted, and primary efficient removal of phosphorus is achieved; then, a deep phosphorus removal adsorbent is used for directionally adsorbing trace phosphorus in the cobalt sulfate primary purification liquid, so that deep removal of phosphorus is further realized; and finally, the residual trace iron is precipitated and separated in the oxygen-containing atmosphere, so that the purity of the secondary purified cobalt sulfate liquid is further guaranteed.

The invention discloses a cobaltous sulfate electroplating solution. The cobaltous sulfate electroplating solution comprises the following components of cobaltous sulfate with the concentration of 4-9 g / L, boric acid with the concentration of 20-40 g / L, an additive B with the concentration of 1-5 g / L and water. Wherein g / L represents the ratio of the mass of each component to the total volume of the cobaltous sulfate electroplating solution; the additive B is one or two of compounds as shown in a formula I and a formula II. When the cobaltous sulfate electroplating liquid is used for micropore cobalt electroplating filling, a high filling deposition rate can be obtained, and the effects that micropores are free of gaps and even in filling are achieved.

The invention discloses a preparation method of nano spherical cobalt powder, and relates to a preparation method of nano spherical cobalt powder for a hard alloy cutter. According to the method, cobalt sulfate and ammonium bicarbonate serve as raw materials, spherical cobalt carbonate particles containing a large amount of complex ammonia are prepared under the low-temperature and high-ammonia synthesis conditions, then the synthesized spherical cobalt carbonate is pulpified through hot pure water, under the action of the hot pure water, the complex ammonia overflows from the interior of the spherical cobalt carbonate particles, and the spherical cobalt carbonate particles are subjected to high-temperature high-ammonia synthesis. The preparation method comprises the following steps: firstly, preparing spherical cobalt carbonate, converting the spherical cobalt carbonate into micron loose cobalt carbonate spherical particles consisting of nano spherical cobalt carbonate particles, then, enabling the micron cobalt carbonate particles to collide with one another and be crushed into nano spherical cobalt carbonate particles in a manner of improving the stirring strength, and reducing the obtained nano spherical cobalt carbonate particles with hydrogen to obtain the nano spherical cobalt carbonate. And the nano spherical cobalt powder product is obtained. The preparation method of the nano spherical cobalt powder is simple in raw materials and process and easy for industrial production.

The invention discloses a high-wear-resistance Co-W composite coating electrolyte based on bifunctional particles as well as a preparation method and an electro-deposition method thereof, and relates to the technical field of material surface engineering. The electrolyte takes water as a solvent, and the mass percent of solutes in an electrolyte system is as follows: 3.59 to 8.07 percent of cobalt sulfate, 6.4 to 14.4 percent of sodium tungstate, 7.69 to 17.3 percent of a complexing agent, 1.92 to 4.32 percent of sodium chloride, 2.56 to 5.76 percent of a buffering agent, 2.56 to 5.76 percent of silicon carbide, 0.07 to 0.15 percent of carbon powder and 0.01 to 0.03 percent of a surfactant. And based on the electrolyte, the high-wear-resistance Co-W composite coating is prepared by adopting an electro-deposition method. By means of the supporting effect of the Co-W alloy matrix and the synergistic interaction of the silicon carbide and carbon powder dual-function particles, the comprehensive performance of the coating is remarkably improved, the whole process is convenient, fast and efficient, and the surface protection requirements of all industrial parts are met.

The present invention relates to the technical field of anti-corrosion treatment of copper-plated welding wires, and particularly relates to a pre-treatment solution for anti-corrosion of copper-plated welding wires, an anti-corrosion electroless plating solution, and an anti-corrosion treatment method. The treatment solution is an aqueous solution containing isopropanol, oxalic acid, benzotriazole, and a surfactant. The electroless plating solution comprises the following raw materials: borax, a composite complexing agent, cobalt sulfate, sodium borohydride, 5,5-dimethylhydantoin, sodium molybdate, sodium borohydride, and hydrazine hydrate. The anti-corrosion treatment method comprises the following steps: immersing the copper-plated solid-core welding wire in the pre-treatment solution at 35-50°C and applying ultrasonic treatment; immersing the copper-plated solid-core welding wire after the pre-treatment in the electroless plating solution at 70-85°C for treatment, cleaning it thoroughly with deionized water, and then drying it. The present invention can improve the corrosion resistance of the welding wire on the premise of basically not affecting the electrical conductivity, thereby solving a series of problems caused by poor corrosion resistance, and having good economic benefits.

The invention relates to the technical field of metal materials, and discloses steel for a pre-nickel-plated battery shell and a preparation method of the steel. The method comprises the steps of hot rolling, coiling, acid pickling, cold rolling, nickel electroplating and continuous annealing. The nickel electroplating process comprises the steps that nickel sulfate, nickel chloride, cobaltous sulfate, boric acid, lauryl sodium sulfate, citric acid, pretreatment filler, nanometer titanium dioxide particles and cerium salt are prepared into electroplating liquid, then the steel matrix obtained after cold rolling is placed in the electroplating liquid to be electroplated, and the concentration of the pretreatment filler is 1.2-1.5 g / L; the concentration of the nano titanium dioxide particles is 0.5 to 1.0 g / L, and the concentration of the cerium salt is 0.1 to 0.2 g / L. The steel for the pre-nickel-plated battery shell prepared by the method has excellent corrosion resistance, relatively high hardness and good stamping performance, the binding force between a nickel-plated layer and a steel substrate is strong, and the surface iron exposure rate is low.

Drying equipment for cobaltous sulfate production comprises a fixed charging barrel which is obliquely arranged, a roller assembly is arranged in the fixed charging barrel, a feeding assembly is arranged at one end of the fixed charging barrel, and a discharging opening is formed in the bottom of the other end of the fixed charging barrel; the outer side of the roller inner sleeve is provided with a plurality of roller shells with the radiuses increasing in sequence, material flow channels are arranged between the roller inner sleeve and the roller shell on the innermost side and between every two adjacent roller shells, and material screening holes are distributed in the roller shells between the roller shell on the outermost side and the roller inner sleeve. Materials enter the corresponding roller shells in a layered mode after passing through the feeding assembly, the first motor drives the roller shells to rotate, and meanwhile the materials move along the roller shells till the materials enter the discharging opening of the fixed material barrel from one ends of the roller shells. The method is used for preventing agglomerated cobaltous sulfate particles from being not fully dried, and the drying effect of cobaltous sulfate is improved.

The invention discloses an electroplating grinding rod for mobile phone lens machining. The electroplating grinding rod comprises a fixing handle, a connecting part, a first electroplating base body and a second electroplating base body. The fixing handle is installed at the top end of the connecting part, the first electroplating base body is installed at the bottom end of the connecting part, and the second electroplating base body is located at the bottom end of the first electroplating base body. Through the synergistic effect of the cobalt sulfate, the nickel chloride hexahydrate, the nickel sulfate heptahydrate, the lauryl sodium sulfate, the boric acid, the saccharin, the 1, 4-butanediol and the water, the electroplating hardness of the electroplating grinding rod is effectively enhanced, and therefore the service life of the electroplating grinding rod is further prolonged.

The present invention provides a starting material for dry smelting, with which it is possible to efficiently produce a metal that contains a valuable metal, while suppressing the discharge amount of carbon dioxide.　A starting material for dry smelting according to the present invention contains carbon (C) and at least one valuable metal selected from among nickel (Ni) and cobalt (Co), and has a C content of 25% by mass or less and C / (Ni + Co) of 2.5 or less. This starting material for dry smelting can be produced by a method which includes: a step for preparing a starting material that contains carbon and at least one valuable metal selected from among Ni and Co; a first classification step for subjecting the starting material to classification so as to divide the starting material into a coarse grain powder A1 that contains the valuable metal and a fine grain powder A2; and a second classification step for subjecting the fine grain powder A2 to classification so as to divide the fine grain powder into a coarse grain powder B1 and a fine grain powder B2. Specifically, the coarse grain powder A1 and the coarse grain powder B1 are recovered so as to be used as a starting material for dry smelting.

The invention discloses a cobalt sulfate solution purification copper and nickel removal ion exchange device which comprises a reaction tank, a stirring mechanism is arranged on the inner wall of the upper end of the reaction tank, a separation mechanism is arranged at the lower end of the reaction tank and comprises a separation bin, and a liquid separation cavity is formed in one side of the inner wall of the separation bin. And a solid separation cavity is formed in the other side of the inner wall of the separation bin. The invention belongs to the technical field of ion exchange, and aims to solve the problem that in the prior art, solid and liquid cannot be cleaned out after separation, so that the operation of a device is troublesome. The ion exchange device for purifying and removing copper and nickel from the cobaltous sulfate solution has the technical effects that after separation, solids and liquid can be cleared out more quickly, residual residues and residues generated by ion exchange are convenient to separate from the ion exchange solution, and the efficiency of purifying and removing copper and nickel from the cobaltous sulfate solution is effectively improved.

This invention relates to the field of sodium-ion battery technology and discloses a method for preparing a modified sodium vanadium phosphate cathode material, comprising the following steps: Step 1: Add 1-4g of ammonium metavanadate and 0.8-2.6g of oxalic acid to 50-200mL of deionized water, stir and react at 60-120℃ for 20-80min, and after slight cooling, add sodium phosphate; after stirring, add cobalt sulfate heptahydrate, and then dry and grind the solution to obtain precursor powder. Step 2: Calcine the precursor powder in a high-temperature tubular furnace at 600-1200℃ for 8-24h to obtain the modified sodium-ion battery cathode material powder. This invention uses a chemical synthesis method to prepare the precursor and employs an energy-saving calcination process to prepare a cobalt particle-filled sodium vanadium phosphate cathode material for the first time. This process has the advantages of mild reaction conditions, high product purity, good particle size uniformity, and easy control of the proportion of each component, and can be continuously prepared and synthesized in large quantities.

The utility model discloses an online mixed ternary precursor synthesis control system, and belongs to the technical field of ternary precursor synthesis. According to the utility model, the problems that the conventional ternary liquid preparation process is not intelligent enough and consumes long time are solved. The on-line mixing synthesis control system comprises five groups of medium pipelines and a static mixer, each group of medium pipelines comprises a raw material pipe, a cleaning water pipe, a first conveying pipe, a second conveying pipe, a return pipe and a three-way ball valve, and the three groups of medium pipelines are correspondingly connected with a nickel sulfate solution storage tank, a cobalt sulfate solution storage tank and a manganese sulfate solution storage tank. The three second conveying pipes are connected to an inlet of the static mixer, the other two second conveying pipes are connected to the reaction kettle, and an outlet of the static mixer is connected to the reaction kettle through a third conveying pipe. Five solutions can be conveyed to a synthesis control system at the same time, a ternary liquid preparation tank and a ternary liquid conveying skid body in the prior art are replaced, and the mixing cost is greatly saved.

The invention discloses a preparation method of cobaltous sulfate electroplating liquid. The preparation method of the cobaltous sulfate electroplating solution comprises the following steps: mixing raw materials with the following concentrations to obtain the cobaltous sulfate electroplating solution, the raw materials comprise cobalt sulfate with the concentration of 4-9 g / L, boric acid with the concentration of 20-40 g / L, an additive B with the concentration of 1-5 g / L and water. Wherein g / L represents the ratio of the mass of each component to the total volume of the cobaltous sulfate electroplating solution; the additive B is one or two of compounds as shown in a formula I and a formula II. When the cobalt sulfate electroplating solution prepared by the preparation method is used for micropore cobalt electroplating filling, a relatively high filling deposition rate can be obtained, and the effects that micropores are free of gaps and are uniformly filled are realized.

The present application belongs to the technical field of magnesium-zinc magnesium alloy surface treatment, and particularly relates to a method for in-situ growth of different blue ceramic film layers on the surface of magnesium-zinc magnesium alloy. The method comprises the following steps: polishing and cleaning the surface of a magnesium-zinc magnesium alloy sample, then sequentially performing first alkali washing, first water washing, first acid washing, second water washing, second acid washing, third water washing and second alkali washing on the surface of the sample to obtain a pretreated magnesium alloy; placing the pretreated magnesium alloy in an electrolyte for micro-arc oxidation treatment to in-situ generate a blue ceramic film layer on the surface of the magnesium alloy; the electrolyte is a fluorotitanic acid potassium and cobalt sulfate added in a silicate and phosphate composite electrolyte system; or the electrolyte is a fluorotitanic acid potassium added in a phosphate electrolyte system. The present application prepares different blue ceramic film layers, which can improve the ornamental property of magnesium-zinc magnesium alloy components and improve the visual effect.

The invention discloses a preparation method and application of a composite material for extracting low-impurity uranium from seawater, and the preparation method comprises the following steps: dissolving ammonium molybdate tetrahydrate in boiling water, and then pouring a cobaltous sulfate heptahydrate solution into the boiling solution; then adding H2O2 while stirring, and continuously boiling; performing low-temperature cold crystallization on the obtained product, and performing low-temperature crystallization on the obtained crystal twice in water to obtain relatively pure CoMo6; the preparation method comprises the following steps: adding CoMo6 into deionized water, then adding thiourea and stirring, then carrying out hydrothermal reaction on the CoMo6 and foamed nickel treated by hydrochloric acid in a reaction kettle, washing the obtained material by using deionized water and ethanol after the hydrothermal reaction is completed, and then drying to obtain the CMOS (at) NSF composite material. According to the present invention, the prepared CMOS (at) NSF composite material has strong UO2 < 2 + > capturing ability, and can effectively capture uranium in seawater, the U (VI) extraction rate of the true seawater uranium by using the CMOS (at) NSF composite material in the self-assembly device reaches 86.67%, and the extraction ability is 2.65 mg / g per day.

The present invention discloses a crystal white porcelain blank and a preparation method thereof, belonging to the technical field of crystal white porcelain blanks. Longyan washed clay, Longyan raw ore, potassium feldspar ore, sodium feldspar ore, high-white washed clay, calcined talc, composite whiskers, quartz powder, zircon sand, yellow cattle bone ash and cobalt sulfate powder are wet ball-milled and mixed in proportion and then screened through a 300-325 mesh sieve. An electromagnetic iron remover is used to remove iron under a magnetic induction intensity of 10,000 Gs to obtain a mixed material; the mixed material is transferred to a vacuum clay kneader and kneaded into clay segments under the condition of a vacuum degree of -0.08 to -0.096 MPa, and the water content of the clay segments is controlled to be 22% to 24%. After aging for 1 to 2 days, the clay segments are kneaded for 1 to 2 h under the condition of a vacuum degree of -0.08 to -0.096 MPa to obtain a crystal white porcelain blank; the crystal white porcelain blank has both good plastic properties and good slip casting properties, which is beneficial to reducing the difficulty in the production system and production management.

The utility model discloses a cobaltous sulfate solution extraction device which comprises an extraction cylinder, a transmission mechanism is arranged above the extraction cylinder, the transmission mechanism comprises a stirring shaft used for stirring materials, one end of the stirring shaft is sleeved with a gear, and the other end of the stirring shaft is provided with stirring blades; the gear disc is fixedly arranged below the motor and is meshed with the gear; one end of the connecting rod is connected with an output shaft of the motor, and the other end of the connecting rod is connected with the stirring shaft; the universal ball is located in the center of the isolation plate, and the stirring shaft penetrates through the center of the universal ball. The transmission mechanism is arranged in the extraction barrel, and the stirring shaft is driven by the motor to drive the stirring blades to synchronously rotate in the extraction barrel during use, so that efficient rotation control on the stirring shaft can be realized, liquid in the extraction barrel is fully stirred and mixed, and the mixing efficiency of liquid extraction is improved; the problem of incomplete extraction and precipitation caused by non-uniform mixing is avoided.

The invention discloses a foamed nickel-based heterostructure electro-catalytic material, which is characterized in that thiourea, cobaltous sulfate, sodium hypophosphite and ammonium fluoride are used as reaction raw materials, and the nickel-based electro-catalytic material with a heterostructure is prepared on a foamed nickel substrate through a two-step hydrothermal method; the invention further discloses a preparation method of the foamed nickel-based heterostructure electro-catalytic material and application of the electro-catalytic material. The electrocatalytic material prepared by the two-step hydrothermal method provided by the invention effectively improves the selectivity problem of the foamed nickel-based heterostructure electrocatalytic material in the electrochemical oxidation process of 5-HMF, and realizes higher conversion efficiency, product yield and Faraday efficiency at lower reaction potential.

The high-purity cobalt sulfate washing tower comprises a tower body and a mixing bin fixedly installed at the upper end of the tower body, a material injection opening is formed in the upper end of the mixing bin in a penetrating mode, a double-shaft motor is fixedly installed at the upper end of the tower body, and a rotating plate is fixedly installed at the output end of the lower end of the double-shaft motor; a stirring rod is fixedly mounted at the output end of the upper end of the double-shaft motor, a cam is fixedly mounted on the surface of the stirring rod, and an indirect communication mechanism is arranged on the outer side of the cam. According to the high-purity cobaltous sulfate washing tower, mixed high-purity cobaltous sulfate is fed into the spraying plate through the communicating pipeline, and the spraying plate can spray liquid or gas fed from the feeding pipeline to the lower end, so that a high-purity cobaltous sulfate solution can be mixed with a device needing to be treated; the high-purity cobaltous sulfate liquid sprayed by the spraying plate can be fully sprayed into the tower body through the rotating plate, the high-purity cobaltous sulfate liquid can be comprehensively fed, and the washing effect of the device is improved.

The invention relates to a preparation method of a high-purity cobaltous sulfate electrolyte for electrolyzing cobalt, and belongs to the technical field of electrolytes. The invention discloses a preparation method of a high-purity cobalt sulfate electrolyte for electrolytic cobalt, which specifically comprises the following steps: (1) crushing a waste ternary lithium battery to obtain battery powder; (2) adding water and sulfuric acid into the battery powder to obtain a dissolving solution; (3) adding a reducing agent into the dissolved solution, filtering, adding potassium permanganate and sodium chlorate into the filtrate, and filtering to obtain filtrate a; and (4) adsorbing impurities in the filtrate a by using ion exchange resin, wherein the adsorbed solution is the high-purity cobalt sulfate electrolyte. The high-purity cobaltous sulfate electrolyte is obtained by taking a waste ternary battery as a raw material and carrying out crushing, dissolving, reduction, oxidation precipitation and impurity removal by using ion exchange resin.

The invention provides a method for removing organic impurities in a cobaltous sulfate solution and a production device of the cobaltous sulfate solution. The removing method comprises the following step: carrying out mineralization treatment on the organic impurities in the cobaltous sulfate solution by adopting a hydrogen peroxide solution. The total organic carbon content in the high-purity cobalt sulfate solution obtained through the removal method is lower than 5 ppm, the use requirement of an electroplating solution for cobalt interconnection of an integrated circuit is met, hydrogen peroxide introduced in the removal method can be automatically decomposed into water and oxygen, and new impurity pollution cannot be introduced into the cobalt sulfate solution.

The invention provides a cobalt sulfate solution impurity element gradient separation and purification method based on compound backwashing, and relates to the technical field of element treatment.The cobalt sulfate solution impurity element gradient separation and purification method comprises the steps that a heavy metal solution is subjected to coagulating sedimentation and solid-liquid separation, then the pH value is adjusted, and ion exchange treatment is conducted through ion exchange resin prepared from para-aramid fibers and polystyrene sulfonate; monitoring the concentration of heavy metal ions at the water outlet end of the resin bed layer in real time through a photoelectric sensing system, and starting microwave field assisted regeneration when a threshold value is reached; and the treating fluid is subjected to pH regulation and heavy metal ion residue detection. Efficient gradient separation and purification of impurity elements in the cobaltous sulfate solution are achieved, and the treatment efficiency and the resin utilization rate are improved.

The invention provides a basic electroplating solution for cobalt interconnection of an integrated circuit as well as a preparation method and application of the basic electroplating solution. The preparation method comprises the following steps: providing a cobaltous sulfate stock solution and a boric acid solution; heating the cobaltous sulfate stock solution to a supersaturated state, cooling and crystallizing to obtain high-purity cobaltous sulfate crystals; adding the cobaltous sulfate crystal into a boric acid solution, mixing and filtering to obtain the basic electroplating solution for cobalt interconnection of the integrated circuit; before the cobalt sulfate crystals are added into the boric acid solution, impurities in the boric acid solution are removed. According to the technical scheme, operation is easy, the provided basic electroplating liquid for cobalt interconnection is high in purity, and the purity requirement of the electroplating liquid for cobalt interconnection of an integrated circuit is met.

The invention relates to the technical field of metal powder metallurgy, and discloses a production method for low-apparent-density iron-copper-tin-cobalt alloy powder, which can effectively reduce the cost and realize controllable production. The production method of the low-apparent-density iron-copper-tin-cobalt alloy powder comprises the following steps: S1, selecting low-apparent-density iron powder as a precursor, feeding the precursor into a reaction kettle in which an acid solution is added, and carrying out surface pretreatment to prepare a metal core; s2, the prepared copper salt solution is guided into a reaction kettle with the surface pretreated to be subjected to copper metal replacement coating; s3, on the basis of the copper-coated iron powder, a stannous sulfate solution and a cobaltous sulfate solution are introduced, tin and cobalt are deposited through the replacement effect, and multi-component composite powder is formed; and S4, washing and drying the completely coated product to obtain the low-apparent-density copper-iron-tin-cobalt pre-alloyed powder. The production method of the low-apparent-density iron-copper-tin-cobalt alloy powder is simple and controllable in process, and the requirement of large-scale industrial production can be well met.

The invention provides a preparation method of a battery-grade cobalt sulfate solution, which comprises the following steps: mixing crude cobalt hydroxide with water to obtain crude cobalt hydroxide slurry, adding acid into the crude cobalt hydroxide slurry to adjust the pH value to be below 8, carrying out magnesium removal reaction, and carrying out solid-liquid separation to obtain a magnesium-removed solid product; mixing the magnesium-removed solid product with water, and adding acid and a reducing agent for acid dissolution to obtain an acid-soluble solution; the acid solution is subjected to iron removal, calcium and magnesium removal and fluorine removal, and fluorine-removed liquid is obtained; and extracting the fluorine-removed liquid by adopting a P204 extracting agent to obtain raffinate, and removing oil from the raffinate to obtain the battery-grade cobalt sulfate solution. According to the method, high-impurity raw materials with high Mg and Ca content can be treated through acid pickling magnesium removal, acid dissolution, iron removal, calcium and magnesium removal through fluorination, deep fluorine removal, P204 extraction refining and oil removal, the cost can be reduced, and the battery-grade cobalt sulfate solution with low impurity content is obtained.

The utility model discloses an evaporation concentration and crystallization device for cobalt sulfate-containing battery recovery leachate, which is characterized in that an outlet of a cobalt sulfate feed liquid pipe is connected with a circulating pipe of a triple-effect falling film evaporation unit through a preheating unit, the triple-effect circulating pipe is connected with a circulating pipe of a first-effect evaporation system, the first-effect circulating pipe is connected with a circulating pipe of a second-effect evaporation system, and the second-effect circulating pipe is connected with a circulating pipe of a third-effect falling film evaporation unit. The double-effect circulating pipe is connected with a feed port of a DTB flash evaporation crystallizer through a double-effect discharge pump, a crystal slurry outlet of the DTB flash evaporation crystallizer is connected with an inlet of a flash evaporation thickening tank through a flash evaporation crystal slurry pump, a bottom outlet of the flash evaporation thickening tank is connected with an inlet of a centrifugal machine, and a solid phase outlet of the centrifugal machine is connected with a cobaltous sulfate discharge pipe; the first-effect secondary steam outlet is connected with a heat source inlet of the second-effect evaporation system, the second-effect secondary steam outlet and the third-effect secondary steam outlet are both connected with an inlet of the steam compressor, and a secondary steam pipe of the compressor is connected with heat source inlets of the first-effect evaporation system and the third-effect falling film evaporation unit. The device can reduce cost and energy consumption and improve economic benefits.