321results about "Nickel sulfates" patented technology

The present invention provides a method for jointly treating laterite nickel ore and nickel-iron alloy and recovering nickel and iron, comprising: (1) slurrying the laterite nickel ore and then performing acid leaching treatment, and obtaining a first leachate after solid-liquid separation; (2) mixing the nickel-iron alloy and the first leachate obtained in step (1) for reaction, and obtaining a second leachate after solid-liquid separation; (3) mixing a phosphorus source, an oxidant, a precipitant and the second leachate obtained in step (2) for reaction, and obtaining an iron phosphate product and a nickel-containing solution after solid-liquid separation; (4) sequentially removing impurities, concentrating and crystallizing the nickel-containing solution obtained in step (3) to obtain battery-grade nickel sulfate. The method utilizes the laterite nickel ore atmospheric pressure leachate, which is high in acid and rich in Fe 3+ The nickel-iron alloy is treated by using the nickel-iron to neutralize the residual acid in the leaching solution and to utilize the residual acid and Fe in the leaching solution. 3+ The strong oxidizing property promotes the dissolution of nickel-iron, achieving efficient recovery of nickel and iron, and ultimately obtaining iron phosphate and battery-grade nickel sulfate.

The disclosure discloses a method for preparing battery-grade nickel-cobalt-manganese sulfate crystals from low nickel matte, which includes the following steps: S1, sequentially performing high-pressure leaching, iron-aluminum removal and nickel-cobalt-manganese precipitation treatment on laterite nickel ore to obtain an underflow containing nickel-cobalt-manganese hydroxide, wherein the pH value of the underflow is 7-8; S2, performing oxygen-pressure leaching on the low nickel matte using sulfuric acid and oxygen to obtain a leached slurry containing residual acid, adding the underflow into the leached slurry to obtain a mixed slurry, and adjusting the pH value of the mixed slurry to be 3-5 using the underflow; and S3, performing filter pressing on the mixed slurry to obtain filtrate and tailings, and performing nickel-cobalt-manganese co-extraction, concentration and crystallization on the filtrate to obtain the nickel-cobalt-manganese sulfate crystals. The method has the advantages of high utilization rate of nickel, cobalt and manganese, few impurities, reduced reagent consumption and technological processes, and high transportation efficiency.

A treatment process for crystallizing a metal sulfate involving pre-treating a feedstock comprising calcium, magnesium, and / or lithium impurities, the pre-treating involving pre-leaching the feedstock in the presence of a lixiviant, selectively extracting a first portion of any of the impurities from the feedstock, and forming a leached solution comprising an uncrystallized metal sulfate and any remaining impurities; and / or refining the leached solution and removing a second portion of any of the remaining impurities; and crystallizing the uncrystallized metal sulfate from the leached solution to form a crystallized metal sulfate. So processed, the crystallized metal sulfate may be battery-grade or electroplating-grade.

The invention belongs to the technical field of waste battery recovery and regeneration, and particularly relates to a method for recovering valuable metal from a waste lithium battery positive electrode material. The method comprises the following steps: carrying out sulfuration roasting on waste positive electrode powder, selectively extracting lithium in a water leaching manner, and precipitating lithium to obtain lithium carbonate; separating and purifying the nickel, the cobalt and the manganese through microwave acid leaching, precipitation impurity removal and step-by-step extraction to obtain extract liquor of the nickel, the cobalt and the manganese, and performing reverse extraction on the extract liquor to obtain battery-grade cobalt sulfate, battery-grade nickel sulfate and battery-grade manganese sulfate. According to the method, lithium is extracted firstly, the influence of the lithium element on subsequent nickel-cobalt-manganese extraction is reduced, meanwhile, the recovery rate of lithium is increased through the water leaching method, and the recovery cost is reduced. According to the method, precipitation and impurity removal are performed before nickel-cobalt-manganese extraction, so that the content of impurities in a sulfate solution is reduced, and the recovery rate of nickel, cobalt and manganese is greatly improved.

The invention relates to a method for recycling battery-grade nickel sulfate from nickel-containing industrial waste, and belongs to the technical field of nonferrous metallurgy. The method comprises the steps that the nickel-containing industrial waste is subjected to water leaching treatment, and nickel-containing leachate is obtained; carrying out gradient pH regulation and control on the nickel-containing leaching solution by adopting calcium carbonate to obtain a purified solution; carrying out first countercurrent extraction on the purified liquid by adopting an organic phase I with the D2EHPA concentration of 0.1-0.3 mol / L; carrying out second counter-current extraction on the raffinate I obtained in the step (3) by adopting an organic phase II with the CYANEX 272 concentration of 0.05-0.2 mol / L; the raffinate II obtained in the step (4) is subjected to adsorption and oil removal through activated carbon and then is subjected to evaporative crystallization, and nickel sulfate crystals and crystallization mother liquor are obtained. The method is high in nickel recovery rate, the purity of nickel sulfate is larger than or equal to 99.9%, and the sodium content is low.

The utility model relates to the field of hydrometallurgy, in particular to a nickel sulfate solution deoiling device. Comprising a standing tank connected with a production process outlet end, one end of an oil removal device is connected with the standing tank, the other end of the oil removal device is connected with a resin adsorption column, the resin adsorption column is connected with a regeneration tank, and the regeneration tank is connected with a solution storage tank. According to the oil removal device arranged in the device, oil can be treated step by step according to different existing forms and physical properties of oil in nickel sulfate through internal fiber cotton filtration, resin adsorption and filter screen filtration, and compared with the prior art, the oil removal effect is better; the device is provided with the oil-water separator and the bag filter, so that the oil removal effect can be further improved, and impurities in the nickel sulfate solution can be separated.

The invention discloses a method for preparing battery-grade nickel sulfate through collaborative purification of crude nickel sulfate and crude nickel carbonate. According to the method, crude nickel sulfate is dissolved firstly, then crude nickel carbonate is utilized for batch synergistic neutralization, and the alkalinity of the nickel carbonate is effectively utilized to reduce extra acid and alkali consumption. And then through multi-stage fine purification, including Fe oxidation and preliminary precipitation, Cr (VI) reduction and high-pH precipitation, main impurities such as iron, chromium, aluminum and the like are efficiently removed. And after the mother liquor is adsorbed by activated carbon and trace impurities are removed by strong-acid cation exchange resin, vacuum evaporation and concentration are carried out, and seed crystals are introduced for cooling crystallization, so that pure NiSO4. 6H2O crystals are obtained. The whole technological process pays attention to resource recycling, washing water recycling and nickel recycling of nickel-containing filter residues, waste gas and waste liquid are treated, and clean production is achieved. The nickel sulfate product prepared by the method is high in purity, meets the battery grade standard, and has good economic benefits and environmental benefits.

The present disclosure provides a method of recovering a spent battery cathode material comprising lithium and at least one of nickel, cobalt and / or manganese, the method comprising: heating the spent battery cathode material in a reducing atmosphere to form a heat-treated spent battery cathode material comprising LiF and one or more of LijO, LiOH and LijCOs; washing the heat treated waste battery cathode material in an aqueous solvent to extract lithium-containing species and fluorine-containing species wherein the aqueous solvent is free of alkaline earth metal hydroxides or other species intended to reduce or prevent soluble fluorine species from remaining dissolved in the aqueous solvent; separating an aqueous solvent comprising lithium and fluorine species from the heat treated waste battery material; after separating an aqueous solvent comprising lithium and fluorine species from the heat-treated waste battery material, treating the aqueous solvent to separate lithium species from fluorine species; recycling a lithium substance in the form of lithium hydroxide or lithium carbonate; forming an acidic aqueous recovery feed comprising one or more of nickel, cobalt and / or manganese by leaching the heat treated waste battery cathode material with a mineral acid after the step of separating the aqueous solvent from the heat treated waste battery material; and recovering one or more of nickel, cobalt and / or manganese from the acidic aqueous recovery feed by a further process step selected from one or more of solvent extraction, solid phase extraction, electrochemical extraction and precipitation processes.

The utility model discloses a nickel sulfate purification device. The nickel sulfate purification device comprises a purification tank, the top cover is arranged at the top of the purification tank; the stirring assembly is arranged in the top cover; the stirring assembly comprises a motor, a rotating rod and a stirring frame; the top of the top cover is fixedly connected with a motor; an output shaft of the motor is fixedly connected with a rotating rod through a coupling; the outer wall of the rotating rod is fixedly connected with a stirring frame; the filler assembly is arranged at the top of the top cover; the packing assembly comprises a fixing groove, a fixing pipe, a nozzle, a threaded sleeve, a self-locking screw, a piston and an adjusting disc. According to the nickel sulfate purification device, the motor is mounted on the top cover, so that the motor can drive the rotating rod to rotate, the rotating rod can drive the stirring frames on the two sides to rotate, the multiple stirring frames can effectively and uniformly mix materials in the purification tank, the mixing efficiency of various materials can be improved, and the practicability of the nickel sulfate purification device is improved. The practicability of the purification device is improved.

The invention discloses a recycling method of NF3 residual electrolysis liquid, and relates to the technical field of residual electrolysis liquid recycling treatment. The method comprises the following steps: step 1, removing Fe ions in the electrolytic residual liquid: firstly, adding hydrogen peroxide or oxygen into the electrolytic residual liquid for reaction, oxidizing ferrous ions into ferric ions, then adding ammonia water and sodium hydroxide or ammonium bicarbonate and sodium hydroxide into the solution for reaction, precipitating ferric ions in the form of ferric hydroxide; 2, hydrofluoric acid is added into the electrolyte solution obtained after iron removal to adjust the pH of filtrate to 3-12, the filtrate enters an extraction system, the nickel element in ammonium hydrogen fluoride is extracted out, and ammonium hydrogen fluoride is purified; and step 3, the nickel element separated from the electrolyte enters a second section to be extracted and synthesized into a nickel sulfate product.

The invention discloses a method for deeply removing arsenic from a nickel sulfate solution, which comprises the following steps: adjusting the pH value by using nickel hydroxide to form colloid to preliminarily remove arsenic, oxidizing by using sodium sulfate, and adding polyferric sulfate to form ferric hydroxide colloid to deeply adsorb and remove arsenic, and is simple in process, convenient to implement in the production process, capable of greatly reducing the cost and reducing the environmental pollution, and suitable for industrial production. The method comprises the following steps: adjusting the pH value of a low-pH leaching solution / anolyte / crude nickel sulfate dissolving solution to 4.0 or more by using nickel hydroxide, carrying out filter pressing to remove slag, adding arsenic ions in a sodium persulfate oxidation solution, reacting for 30 minutes, adding polyferric sulfate, reacting for 30 minutes, and carrying out filter pressing to obtain a nickel sulfate solution which is almost free of arsenic, and the method is efficient, safe and environment-friendly.

The invention provides a doubling treatment method of battery black powder and nickel cobalt hydroxide. The doubling treatment method comprises the following steps: carrying out reduction roasting and water immersion treatment on the battery black powder to obtain a first lithium-containing liquid and a solid product; carrying out acid leaching on the solid product to obtain a leaching solution; after removing impurities from the leachate, extracting the leachate with a first saponification extraction agent to obtain first raffinate and a first extraction organic phase; carrying out soap conversion reaction on the first raffinate and a second saponification extraction agent to obtain a second extracted and soap-converted organic phase and a second lithium-containing liquid; carrying out acid leaching and impurity removal on nickel cobalt hydroxide, and carrying out extraction reaction on the solution and the second extraction soap-converted organic phase to obtain a second extraction organic phase and a second raffinate; the second raffinate is subjected to Co extraction, Mg extraction and evaporative crystallization, and nickel sulfate is obtained; and the organic phase obtained after Co extraction is subjected to back extraction and evaporative crystallization, and cobalt sulfate is obtained. Compared with a traditional doubling treatment technology, the doubling treatment method avoids the problem of impurity pollution caused by doubling treatment of traditional battery black powder and nickel cobalt hydroxide raw materials.

The invention belongs to the technical field of waste battery recovery, and particularly relates to a short-process method for recovering battery-grade lithium carbonate and valuable metals from waste ternary lithium battery black powder. According to the method, a lithium closed-loop technical system of blank roasting, cyclic leaching, synergistic impurity removal, lithium phosphate aluminum removal, directional extraction and split-flow extraction of lithium, nickel and magnesium and seed crystal induction parallel flow lithium precipitation is constructed, a roasting aid, a reducing agent and an aluminum removal agent do not need to be added in the whole process, and the redundant processes of traditional lithium carbonate purification such as carbonization, resin purification and pyrolysis are omitted; the lithium liquid concentration cost is saved, no hazardous waste exists, green and clean production is achieved, and the quality of battery-grade products is guaranteed through collaborative impurity removal and directional extraction.

The invention relates to a method for recovering nickel and cobalt from a mixture of compounds of these metals from the recycling of spent lithium-ion batteries, comprising the following steps: a) digestion of a mixture of nickel and cobalt compounds in a solution containing hydrochloric acid having a concentration of more than 25 mass %, in case the mixture of nickel and cobalt compounds is solid; or bringing the mixture of nickel and cobalt compounds to a hydrochloric acid concentration of more than 25 mass %, in case the mixture of nickel and cobalt compounds is a solution; b) activation of ion-exchange resin in a column using hydrochloric acid; c) passing the solution from step a) through the column filled with the ion-exchange resin activated in step b); d) washing the column with hydrochloric acid having a concentration of more than 25 mass % in order to wash out the remaining solution containing nickel ions; e) washing the column with hydrochloric acid having a concentration of less than 10 mass % in order to wash out cobalt ions; f) extraction distillation of the nickel ion solution obtained in step d) in hydrochloric acid using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; dissolution of nickel sulfate(VI) and electrolysis in order to recover metallic nickel; g) extraction distillation of the cobalt ion solution obtained in step e) in hydrochloric acid using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; dissolution of cobalt sulfate(VI) and electrolysis in order to recover metallic cobalt; h) extraction distillation of the solution of diluted hydrochloric acid with nickel and cobalt ions obtained after the activation of the ion-exchange resin in step b), using sulfuric(VI) acid; phase separation in a spent liquid; recycling of a filtrate to distillation; recycling of a mixture of the formed cobalt sulfate(VI) and nickel sulfate(VI) to digestion in step a); i) rectification of diluted hydrochloric acid having a concentration below the azeotropic concentration (approx. 20.2 mass % at atmospheric pressure) formed in extraction distillation processes in steps f)-h) in order to concentrate hydrochloric acid and recover and recycle of water; recycling of concentrated hydrochloric acid to extraction distillation in steps f)-h).

The invention provides a new process for comprehensively recovering valuable metals in ternary positive electrode material powder, which comprises the steps of positive electrode material powder dissolution, metal salt separation, extraction and reverse extraction, lithium salt treatment and the like, acid obtained by electrolysis can be recycled, and a lithium salt solution can be further used for preparing a lithium carbonate product. The process has the remarkable advantages that resource recovery is comprehensive and efficient, the valuable metal recovery rate is high, and the metal separation precision is high; the process is environment-friendly and low in cost, auxiliary materials are recycled, the cost is reduced, and environmental pollution is reduced; the product is excellent in quality, low in impurity content and stable in performance, can meet high-end market requirements, and improves the market competitiveness and the added value. The process has outstanding advantages in the aspects of resource recovery, environmental protection cost, product quality and the like, and has wide application prospects and market values.

The utility model belongs to the technical field of industrial crystallization, and discloses a nickel sulfate continuous crystallization system. Comprising a stock solution storage tank, a pretreatment unit, a concentration unit and a crystallization unit, wherein the pretreatment unit comprises an iron remover, a filter and a preheating assembly which are sequentially communicated with a stock solution storage tank; the concentration unit comprises a forced circulation evaporator and a crystallization separator, and the crystallization unit comprises a cooling crystallizer, a cooling circulation pump, a hot crystal eliminator, a condenser, a condensed water tank, a vacuum pump, a thickener and a centrifugal machine. The nickel sulfate continuous crystallization system disclosed by the utility model is convenient to operate, high in continuous cooling crystallization efficiency and suitable for crystallization of nickel sulfate with different particle size requirements.

The disclosure discloses a method for preparing a battery-grade nickel-cobalt-manganese sulfate solution from low nickel matte. The method includes the following steps: grinding low nickel matte, then adding the ground low nickel matte to concentrated sulfuric acid, and carrying out atmospheric pressure leaching to obtain a first slag phase and a first liquid phase; carrying out evaporation concentration-cooling crystallization on the first liquid phase to obtain ferrous sulfate crystals; adding concentrated sulfuric acid to the first slag phase, and carrying out oxygen pressure leaching to obtain a second slag phase and a second liquid phase; adjusting pH of the second liquid phase to 3-4 to generate a precipitate, and removing the precipitate by filtration to obtain a filtrate; carrying out adsorption treatment on the filtrate by adopting chelating resin; washing the adsorbed chelating resin with a first sulfuric acid solution to obtain a washing solution containing Mg and Mn, and then washing the chelating resin with a second sulfuric acid solution to obtain a nickel-cobalt sulfate solution; and mixing the nickel-cobalt sulfate solution with the washing solution containing Mg and Mn to obtain the nickel-cobalt-manganese sulfate solution. According to the method of the disclosure, the battery-grade nickel-cobalt sulfate solution is prepared from the low nickel matte as a raw material, so that the recovery rate of nickel and cobalt is increased, and the acid consumption is reduced.

The present invention provides a process for preparing a high-purity nickel sulphate solution, comprising the steps of: i. forming an aqueous mixed metal sulphate solution by reacting sulphuric acid with a raw material feed comprising nickel, manganese, cobalt, and magnesium in an aqueous medium; ii. extracting manganese from said aqueous mixed metal sulphate solution, thereby obtaining a first aqueous raffinate comprising nickel, cobalt and magnesium, and a manganese-rich organic phase; iii. extracting cobalt from said first aqueous raffinate, thereby obtaining a second aqueous raffinate comprising nickel and magnesium, and a cobalt-rich organic phase; and iv. extracting magnesium from said second aqueous raffinate solution, thereby obtaining a high-purity nickel sulphate solution, and a magnesium-rich organic phase.

The utility model relates to the technical field of cobalt-nickel salt extraction and separation, and discloses an efficient cobalt-nickel salt extraction and separation device which comprises a support, an extraction tank is fixedly connected to the middle of the support, a transverse plate is fixedly connected to the upper portion of the extraction tank, a motor is arranged on the rear side of the outer portion of the transverse plate, and the output end of the motor is fixedly connected with a rotating disc. And a fixed rod is fixedly connected to the outer portion of the rotary disc, the fixed rod is sleeved with a reciprocating rod, guide rings are fixedly connected to the two sides of the outer portion of the transverse plate, the reciprocating rod is slidably connected to the interiors of the two guide rings, and a connecting rod is fixedly connected to the lower portion of the reciprocating rod. According to the extraction tank disclosed by the utility model, in the extraction process, the upper and lower different areas in the extraction tank can be conveniently stirred, uniform distribution of materials in the extraction tank is ensured, contact between cobalt and nickel and a leaching agent can be accelerated, and the extraction efficiency is improved while the reaction rate is improved.

The application discloses a method for recovering nickel and phosphorus from electroless nickel plating waste liquid, and the method comprises the following steps: preparing nickel sulfate through extraction and stripping, and preparing iron phosphate through Fenton oxidation and precipitation; compared with the prior art, the method is characterized in that the waste liquid is pretreated, insoluble solid particles in the waste liquid are removed, emulsification of an extractant caused by particles in a subsequent extraction process is prevented, damage to extraction oil is avoided, and the extraction efficiency is ensured; in addition, the extractant used in the method can be recycled, secondary pollution is avoided, and the method is economical and practical; in the method, main pollutants in waste water are all converted into important chemical raw materials, recycling is realized, sulfuric acid and Fenton reagents used are all converted into terminal products, difficulty of end waste water treatment is not increased, clean production is met, the treatment cost is low, the product has high added value, and the method has strong practicability.

The invention discloses a method for removing aluminum, calcium and magnesium and recovering nickel from waste hydrogenation catalyst pickle liquor through complete extraction, and belongs to the technical field of hydrometallurgy. A method for removing aluminum, calcium and magnesium and recovering nickel from waste hydrogenation catalyst pickle liquor through complete extraction comprises the following steps that S1, the waste hydrogenation catalyst pickle liquor containing nickel, aluminum, calcium and magnesium is taken, the pH of the pickle liquor is adjusted, first-stage multi-stage counter-current extraction is conducted through a composite organic extraction phase, and an aluminum-loaded organic phase and aluminum-removed raffinate are obtained; s2, adjusting the pH value of the aluminum removal raffinate, and carrying out second-stage multi-stage counter-current extraction by adopting a composite organic extraction phase to obtain a calcium and magnesium loaded organic phase and a purified nickel sulfate solution; s3, the purified nickel sulfate solution is subjected to evaporative crystallization, and a nickel sulfate product is obtained; wherein the composite organic extraction phase comprises a main extraction agent, a synergistic extraction agent A and a synergistic extraction agent B; the method has the advantages of being high in nickel recovery rate, thorough in impurity removal, short in technological process, free of slag dust pollution and the like.

The invention belongs to the technical field of hydrometallurgy, and discloses a method for preparing nickel sulfate and cobalt sulfate from nickel feed liquid. The method comprises the following steps: 1) carrying out first extraction on the nickel feed liquid by using a nickel-cobalt extraction agent to obtain a first organic phase and first raffinate; 2) washing the first organic phase with a first washing solution, wherein the first washing solution comprises sulfuric acid and nickel sulfate; (3) the washed first organic phase is subjected to reverse extraction, and a first regenerated organic extraction agent and nickel-cobalt enrichment liquid are obtained; 4) performing second extraction on the nickel-cobalt enriched liquid by using an impurity extracting agent to obtain a second organic phase and a mixed solution of nickel sulfate and cobalt sulfate; 5) washing the second organic phase by using a sulfuric acid solution, and 6) carrying out reverse extraction on the washed second organic phase to obtain a reverse extraction solution and a second regenerated organic extracting.By adopting the method provided by the invention, nickel and cobalt enrichment can be realized from the high-calcium-magnesium solution, impurity ions can be effectively removed, the process is simple, and the cost is low.

Provided is a method capable of selectively leaching Ni from an oxidized ore containing Ni and Si. The method of leaching nickel from an oxidized ore according to the present disclosure includes the steps of: preparing a liquid leaching agent containing a hydrogen bond acceptor that has made contact with hydrochloric acid, and a hydrophobic organic compound (provided that unsubstituted alicyclic hydrocarbon compounds and unsubstituted aromatic hydrocarbon compounds are excluded); and contacting an oxidized ore containing nickel and silicon with the leaching agent.

The invention provides a silicon removal agent as well as a preparation method and application thereof, and the silicon removal agent is prepared from the following raw materials: zirconium sulfate, a sulfur-containing organic chelating agent and polyhydroxy carboxylic acid. The silicon removal agent provided by the invention solves the problems of low silicon removal efficiency, great influence by the fluctuation of the silicon content of the previous liquid and difficulty in stable deep silicon removal of the silicon content of the liquid after silicon removal in the existing nickel sulfate silicon removal process.

It is provided a process for extracting nickel sulfate from mining ores, such as serpentine, comprising the steps of conducting a magnetic separation of the mining ores producing a magnetic fraction and a non magnetic fraction; leaching the non magnetic fraction with HCI producing a slurry comprising metals chloride; filtrating the slurry producing a metals chloride liquor; purifying the metals chloride liquor producing a magnesium chloride solution; separating an iron-nickel cake from the magnesium chloride solution; leaching the cake together with the magnetic fraction producing a metallic sulfate solution; extracting nickel and cobalt from the metallic sulfate solution by a ion exchange resin extraction and stripping producing an inorganic stripped phase; submitting the inorganic stripped phase to a liquid-liquid extraction producing a nickel concentrated phase; and evaporating and drying the nickel concentrated phase to recuperate nickel sulfate.

This invention provides a method for recovering valuable elements from battery powder through leaching. The method includes: mixing sulfur powder, concentrated sulfuric acid, and battery powder, and carrying out a aging reaction to obtain an aged material; leaching the aged material to obtain a leachate; mixing the leachate with the pretreated material for a first conditioning treatment, followed by solid-liquid separation to obtain a first liquid phase; subjecting the first liquid phase to impurity removal and solid-liquid separation, and then performing stepwise extraction and back-extraction on the resulting second liquid phase to recover valuable elements such as nickel, cobalt, manganese, lithium, and zinc. This invention can shorten the overall extraction process, reduce the consumption of auxiliary materials such as acids and liquid alkalis at the downstream end, and lower production costs.

Method for producing electronic grade nickel sulfate from nickel powder, crystallization apparatus, and control thereof The present invention provides a method for producing nickel sulfate, and nickel sulfate produced thereby. The process includes acid leaching, copper removal, acid adjustment, concentration, cooling crystallization, drying and sieving, and secondary leaching. Oxidation In the calcination furnace, the temperature is 400 to 700°C, and 1 kg of compressed air is used for each kilogram of nickel powder. ~5m 3 The reaction time is 1.0 to 2.5 hours, and the temperature during acid immersion is controlled to 45 to 70°C. Then, add dilute sulfuric acid to control the pH to 0.5-1.5 and react for 1-3 hours. The copper removal is to replace the copper with nickel powder, and the acid conditioning is to use nickel hydroxide or The pH is adjusted to 2.5-4.5 using nickel carbonate, and the filtrate is concentrated by The cooling crystallization method is to obtain nickel sulfate crystals and return the mother liquor to the concentrate. Drying and sieving is to add the undersieved material to the crystallizer as seed crystals, and secondary leaching is to Dilute sulfuric acid is added to the leaching slag, and it is reacted with nickel sulfate or hydrogen peroxide until nickel is less than 0.1%. If the first stage is full, the second leaching is continued. The crystallizer is a crystallizer that is connected in series with a second-stage crystallizer and a third-stage crystallizer. A crystallization frame, an oscillator provided under the crystallization frame, and an oscillator provided at the exit end of the crystallization frame. The crystallization frame is a rectangular parallelepiped. The bottom of the ribs are evenly spaced, with a cross section of a circular arc. The distance between two adjacent ribs is S is 1 / 25 to 1 / 15 of the width of the crystallization frame, and either the width b or the height h of the rib The width of the crystallization frame is 1 / 100 to 1 / 150 of the width of the crystallization frame. It does not add any new impurity ions, and does not add any oxidizing agent. The nickel sulfate crystal particles produced are uniform and are free of the static generation. This avoids caking of very large particles, irregularly shaped particles and crystals.

The invention discloses a method for recovering metal from electronic waste or leach residue thereof, the electronic waste or leach residue comprising copper element and one or more lithium compounds, the method comprising: leaching the electronic waste or leach residue with a leaching solution comprising ammonium sulfate in the presence of an oxidizing agent, a leaching solution containing copper ions and lithium ions and solid residues are provided; and separating the leachate and the solid residue.

The utility model discloses nickel sulfate crystallization equipment convenient to precool, and relates to the technical field of nickel sulfate production. The nickel sulfate crystallization equipment convenient to precool comprises a precooling containing box and a nickel sulfate solution precooling device, the nickel sulfate solution precooling device comprises a water inlet pipe, a solution inlet pipe, a heat absorption layer, a condensing coil, a heat absorption plate, a water outlet pipe and a solution containing cavity, and the water inlet pipe is fixedly connected to the top of the precooling containing box; the solution inlet pipe is fixedly connected to the top of the pre-cooling containing box body, the heat absorption layer is fixedly connected to the interior of the pre-cooling containing box body, the condensing coil pipe is fixedly connected to the interior of the pre-cooling containing box body, and the top of the condensing coil pipe is communicated with the water inlet pipe. And the nickel sulfate solution pre-cooling device can make full contact with the condensing coil and the heat absorption plate through the arrangement of the stirring blades, and the cooling speed is increased.

A treatment process for crystallizing a metal sulfate involving pre-treating a feedstock comprising calcium, magnesium, and / or lithium impurities, the pre-treating involving pre-leaching the feedstock in the presence of a lixiviant, selectively extracting a first portion of any of the impurities from the feedstock, and forming a leached solution comprising an uncrystallized metal sulfate and any remaining impurities; and / or refining the leached solution and removing a second portion of any of the remaining impurities; and crystallizing the uncrystallized metal sulfate from the leached solution to form a crystallized metal sulfate. So processed, the crystallized metal sulfate may be battery-grade or electroplating-grade.