101results about "Manganese sulfates" patented technology

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 field of lithium recovery, and particularly relates to a method and a system for electrochemically recovering lithium ions in ternary lithium battery leachate. The method comprises the following steps: (1) leaching the cathode material of the waste ternary battery to obtain a ternary leachate; (2) performing lithium ion enrichment in a capacitive deionization device by taking the ternary leaching solution obtained in the step (1) as a lithium source to obtain a lithium-rich receiving solution and a lithium-removed recycling solution; (3) recovering the lithium-rich receiving liquid to obtain recovered lithium; and performing non-lithium metal element recovery on the lithium-removed recovery liquid. According to the technical scheme, the rocking chair type capacitive deionization RCDI system adopts a waste ternary battery cathode material (SNCM) as an electrode material, the extraction quantity of a single reaction cycle can reach 4.90 mM g <-1 >, continuous and selective lithium extraction is realized, and meanwhile, the cost and the environmental influence are reduced.

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 present application relates to electrolytic manganese technology field, specifically to a kind of method for removing heavy metal ions in manganese sulfate solution.The method for removing heavy metal ions in manganese sulfate solution provided by the present application includes the following steps: adding oxidizing agent to pretreated manganese sulfate solution, mixing and stirring, then adjusting the pH value of solution to 5.5-6.0, filtering, to obtain the first purified manganese sulfate solution;Add sulfidation agent to the first purified manganese sulfate solution, filter, to obtain the second purified manganese sulfate solution;Add porous resin polymer to the second purified manganese sulfate solution, add the mixed solution into a sealed container, introduce nitrogen, make the pressure in the sealed container reach 1.1-1.5MPa and maintain for 2-10min, then open the air valve and release pressure instantaneously, stand, filter, fine filter, to obtain the purified manganese sulfate solution.The method provided by the present application can not only effectively remove heavy metal ions in solution, but also effectively reduce the COD value of the purified solution, reduce the loss of manganese content in solution.

Water is added into manganese dioxide powder to prepare manganese slurry, ammonia water or ammonium bicarbonate is used for adjusting the pH value, sulfur-containing flue gas enters a desulfurizing tower to react with the manganese dioxide mineral powder and the manganese slurry to remove sulfur dioxide, manganese sulfate slurry is generated and can be used for obtaining high-purity manganese sulfate, and ammonium sulfate generated through the reaction can be recycled. The process is mild in production condition, SO2 in the flue gas is converted into available manganese sulfate, resource recycling of sulfur dioxide in the flue gas can be achieved, economic benefits are generated, meanwhile, environmental pollution is reduced, and a technical route is provided for sulfur-containing flue gas treatment and resource utilization. The produced manganese sulfate can be used for preparing high-quality battery-grade manganese sulfate, a raw material is provided for the new energy battery industry, and the market competitiveness of enterprises is improved. The process method provided by the invention accords with the concept of combining ecological environment protection and economic development, and has a relatively high application value.

A method of preparing a cathode active material composition involves combining a first cathode active material including recycled lithium 40 with a second cathode active material 41; wherein the ratio

The invention discloses a method for preparing manganese sulfate by treating alkylated waste sulfuric acid through an oxidative degradation-adsorption method, and belongs to the technical field of industrial waste recycling. The method comprises the following steps: by taking pyrolusite as an oxidizing agent, efficiently oxidizing and degrading organic matters in the waste sulfuric acid in an acidic medium of alkylated waste sulfuric acid, and synchronously reducing and leaching manganese; according to the method, pyrite reduction leaching and H2O2 oxidative degradation (assisted by iron ion catalysis) are combined with activated carbon adsorption to deeply treat organic matters in a solution, and finally, high-purity manganese sulfate is prepared through impurity removal and crystallization. According to the method, harmlessness and recycling of the alkylated waste sulfuric acid are achieved, the process cost is low, secondary pollution is avoided, the purity of the manganese sulfate product reaches the industrial grade, and the method can be widely applied to the fields of batteries, fertilizers and the like and has remarkable environmental and economic benefits.

The invention relates to the field of resource utilization of industrial solid wastes, in particular to a method for preparing battery-grade manganese sulfate by purifying industrial solid wastes, which comprises the following steps: by taking silicomanganese metallurgical fly ash as a raw material, grinding, alkaline leaching, heating reaction and centrifugal separation to obtain manganese-containing filter residues; and the battery-grade manganese sulfate is prepared through the steps of sulfuric acid neutralization, filter pressing, oxalic acid-manganese monoxide refining, evaporative crystallization and the like. According to the method, all-component high-value utilization of elements such as manganese, silicon and potassium in the fly ash is achieved, the raw material recovery rate reaches 99.7% or above, the purity of the prepared manganese sulfate is larger than or equal to 99.5%, meanwhile, by-products such as potassium sulfate, sodium chloride, aluminum hydroxide and sludge containing 80% of silicon dioxide are produced, and remarkable economic benefits and ecological benefits are achieved.

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 relates to a comprehensive recovery method of acid waste liquid in a process of producing graphene oxide by a chemical method. The method comprises the following steps: filtering the acid waste liquid to remove impurities; the method comprises the following steps: introducing ammonia gas into the acidic waste liquid, controlling the adding amount of the ammonia gas, enabling the reaction temperature to be within a proper range by virtue of reaction heat generated in a reaction process, and enabling a reaction system to be still acidic, so that part of SO4 < 2-> ions in the acidic waste liquid react with NH3 to generate (NH4) 2SO4, and the residual SO4 < 2-> is combined with Mn < 2 + > ions to form a MnSO4 supersaturated solution which is completely separated out in a salt form; filtering while the solution is hot to obtain a MnSO4 crystal substance and a potassium ammonium sulfate solution; introducing ammonia gas into the ammonium potassium sulfate solution to obtain a mixed solution; and carrying out reduced pressure distillation on the mixed solution to obtain a solid which is the ammonium potassium sulfate compound. The method has the beneficial effects that the resource utilization benefit of each element in the acid waste liquid is maximized, and the production cost of ammonium sulfate potassium compound fertilizer and graphene oxide is reduced.

A method for producing an aqueous manganese sulfate solution using a sulfur dioxide gas reduction leaching method includes: a raw material preparation process of preparing a manganese-containing by-product containing manganese and impurities; a pulverizing and washing process of pulverizing and washing the manganese-containing by-product; a reduction leaching process of leaching a pulverized manganese-containing by-product obtained by the pulverizing and washing process; a neutralization process of neutralizing a leached liquid produced in the reduction leaching process; a first purification process of purifying a neutralized liquid produced in the neutralization process; and a second purification process of further purifying a first-purified liquid produced in the first purification process. The reduction leaching process is performed using an inorganic acid and a sulfur dioxide gas.

In the recovery method provided in this application, CO is generated by the reaction of oxalic acid and concentrated sulfuric acid. This provides an acidic atmosphere for the reaction between the cathode powder and CO, allowing some of the cathode powder (LiMeO2) to melt, transforming the solid-gas two-phase system into a solid-gas-liquid three-phase system, which is beneficial for improving the recovery rate of Li ions in LiMeO2. Furthermore, the use of CO for pre-lithiation results in a low lithium content in the solid filter material, minimizing interference from lithium ions in impurity removal and providing the possibility for subsequent efficient impurity removal. On the other hand, under acidic conditions, CO undergoes a reduction reaction with the cathode powder, reducing high-valence ions in the cathode powder to lower-valence ions, resulting in a more thorough reduction. This allows the solid filter material to dissolve in sulfuric acid, achieving efficient impurity removal. Additionally, Al is removed by adding alkali, oxidant, fluoride, and adsorbent. 3+ Fe 3+ Ca 2+ Mg 2+ F ‑ A second solution containing MeSO4 is obtained, which can be used as a precursor for preparing positive electrode active materials. It achieves efficient overall impurity removal and improves lithium recovery rate, while obtaining a high-purity MeSO4 solution.

This invention discloses a method for producing sulfate from waste acid wastewater, relating to the field of industrial wastewater reuse technology. The method includes the following steps: raw material pretreatment: collecting waste acid wastewater generated from the washing process of non-ferrous metal smelting flue gas, and concentrating it to obtain concentrated acid water; slurrying and leaching: mixing materials containing metal oxides with the concentrated acid water in a certain proportion, and carrying out slurrying and leaching reactions; purification: purifying the leached solution to obtain a purified solution; sulfate preparation: treating the purified solution to obtain a solid sulfate product. This method directly uses waste acid to replace expensive purchased sulfuric acid, significantly reducing the production cost of sulfate. It is particularly suitable when sulfuric acid market prices are high. Conventionally, producing one ton of zinc sulfate consumes 0.43 tons of sulfuric acid, and producing one ton of manganese sulfate consumes 1.23 tons of sulfuric acid. Using this method, sulfuric acid is directly replaced, resulting in significant cost savings.

The application provides a treatment method of nickel cobalt hydroxide, comprising the following steps: a first leaching process, reducing and acid leaching the nickel cobalt hydroxide to obtain a leaching solution; a neutralization process, adding a neutralizing agent to the leaching solution to obtain a neutralized solution; a first sulfuration process, adding a first sulfuration agent to the neutralized solution to obtain a first sulfuration solution; a second sulfuration process, adding a second sulfuration agent to the first sulfuration solution to obtain a second sulfuration precipitate; an ion exchange process, adding an ion exchange solution to the second sulfuration precipitate to obtain a third sulfuration precipitate; and a second leaching process, mixing the third sulfuration precipitate with a solvent and oxygen to perform pressurized leaching, and then obtaining a metal salt solution, wherein the metal salt comprises at least one of a nickel salt, a cobalt salt and a manganese salt. The treatment method provided in the embodiments of the application can remove metal impurities such as calcium and magnesium, so that a product containing nickel, cobalt and / or manganese is obtained.

The invention relates to the technical field of manganese sulfate for manganous-manganic oxide materials, in particular to a low-cost impurity removal method for a by-product manganese salt, which comprises the following steps: by taking the by-product manganese salt as a manganese source, sequentially adding a coagulation agent, an impurity removal agent and an extraction agent to obtain a manganese sulfate solution, re-preparing the impurity removal agent and the extraction agent from the by-product through a stripping agent, and returning the impurity removal agent and the extraction agent to a process system for cyclic utilization. The by-product manganese salt is used as a manganese source, the raw material price is low, wastewater and waste residues generated in the production period can be returned to the technological process for reuse, the cost is saved, the environmental pollution is small, the obtained product manganese sulfate solution can reach the battery-grade manganese sulfate standard, and the fluorine content of the solution is greatly reduced and is obviously superior to that of an existing process.

The application discloses a method for high-value recovery and recycling of high-calcium manganese chloride wastewater in cobalt smelting, which aims to solve the problems of difficult pollution control, low resource recycling rate and high treatment cost in the treatment of high-calcium manganese chloride wastewater in cobalt smelting by conventional technology. The high-calcium manganese chloride wastewater in cobalt smelting is subjected to high-value recovery and recycling through steps of hydrochloric acid back extraction, alternating electromagnetic field assisted impurity removal, Cy272 linkage optimized extraction and NaCl solution electrolysis synthesis. The application adopts hydrochloric acid back extraction to avoid the calcium sulfate scaling problem caused by sulfuric acid back extraction P204; the alternating electromagnetic field assisted impurity removal can effectively improve the particle size of the precipitate and the solid-liquid separation efficiency, and reduce the penetration rate; the linkage optimized extraction for calcium removal avoids the environmental hazards of calcium removal by fluorine compound precipitation. The application has the characteristics of high Mn recovery rate, high waste liquid comprehensive utilization rate and low treatment cost, realizes the high-value recovery of Cu, Mn and other components, and realizes the green recycling of process pollutants such as NaOH solution and HCl solution, and is easy to popularize in industry.

The application provides a method for recycling electrolytic manganese industry waste salt, comprising the following steps: mixing the electrolytic manganese industry waste salt with calcium oxide, then performing first heat treatment and second heat treatment to obtain a treatment product; performing water immersion and solid-liquid separation on the treatment product to obtain first leaching residue and first leaching solution; performing evaporation crystallization on the first leaching solution to obtain a magnesium sulfate product; mixing the first leaching residue with ammonium sulfate and performing ball milling to obtain a mixture; performing calcination on the mixture to obtain a calcination product; performing water immersion on the calcination product to obtain second leaching residue and second leaching solution; performing evaporation crystallization on the second leaching solution to obtain a manganese sulfate product; performing water washing, solid-liquid separation and drying on the second leaching residue to obtain industrial gypsum. The method has the advantages of simple process, mild process conditions, low energy consumption, low cost, elimination of environmental pressure of electrolytic manganese industry waste salt stockpiling, and efficient recovery of Mg, Mn, NH4 + / NH3 and S resources in the electrolytic manganese industry waste salt and recovery of Ca, and the purity of the recovered manganese sulfate reaches the battery grade.

The invention belongs to the field of manganese sulfate solution purification and impurity removal, and discloses a low-cost method for adsorbing and purifying calcium and magnesium in a manganese sulfate solution, which comprises the following steps: (1) at normal temperature, firstly adding a fluorinating agent into the manganese sulfate solution to be subjected to calcium and magnesium purification, stirring for reaction, standing, and reserving calcium fluoride and magnesium slag at the bottom; and (2) adding a manganese sulfate solution of calcium and magnesium to be purified and a fluorinating agent into the calcium magnesium fluoride slag, stirring for reaction, standing, and reserving the calcium magnesium fluoride slag at the bottom for reuse. According to the method, the newly generated calcium fluoride magnesium slag is used for adsorbing and purifying calcium and magnesium in the manganese sulfate solution, a fluorinating agent can be efficiently utilized, steam heating is not used, the using amount of the fluorinating agent is reduced, meanwhile, the steam using cost is saved, the production cost of high-purity manganese sulfate is greatly reduced, operation is easy, and the adsorption and purification efficiency is high.

A method of recycling a waste battery cathode material comprising lithium and at least one of nickel, cobalt and / or manganese, the method comprising: heating the waste battery cathode material in a reducing atmosphere to form a heat-treated waste 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 both lithium containing species and fluorine containing species, wherein the aqueous solvent does not contain an alkaline earth hydroxide or other species intended to reduce or prevent soluble fluorine species remaining dissolved in the aqueous solvent; separating the aqueous solvent comprising lithium and fluorine species from the heat-treated waste battery material; after separating the 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; recovering the lithium species as lithium hydroxide or lithium carbonate; forming an acidic aqueous recycling feed comprising one or more of nickel, cobalt and / or manganese by leaching the heat-treated waste battery cathode material with an inorganic 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 recycling feed via one or more further process steps selected from solvent extraction, solid phase extraction, electrochemical extraction, and precipitation processes.

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 invention discloses a method for producing manganese sulfate by low-temperature roasting and water leaching of manganese alloy slag, which is characterized by comprising the following steps of: drying, crushing and screening the manganese alloy slag, uniformly mixing the manganese alloy slag with a flux according to a mass ratio of (2.5-4.5): 1, heating to 80 DEG C in a tubular furnace under the protection of inert gas, roasting at constant temperature, heating to 280 DEG C, roasting at constant temperature, heating to 630 DEG C, cooling to the room temperature, cooling to the room temperature, cooling to the room temperature, cooling to the room temperature, cooling to the room temperature, cooling to the room temperature, cooling to the room temperature, cooling to the room temperature, and and after roasting is completed, natural cooling is conducted to the room temperature, deionized water is added, manganese sulfate is leached from a roasted sample at the room temperature, filtering separation is conducted, and high-purity manganese sulfate is obtained after classified purification and impurity removal are conducted on filtrate. According to the method, hydrazine hydrate is added into ammonium sulfate, high-valence manganese in the manganese alloy slag is converted into low-valence manganese under the protection of inert gas, and the extraction rate of manganese in the manganese alloy slag is increased.

The invention discloses a solid-state battery material recovery method, and relates to the technical field of solid-state battery recovery, and the method comprises the following steps: heating first mixed powder in air to obtain second mixed powder; the second mixed powder is leached through organic weak acid and a reducing agent, first leaching residues and first leaching liquid are obtained, and then the first leaching liquid is processed through a wet process; the first leaching residues are leached with sulfuric acid, and second leaching residues and second leaching liquid are obtained; precipitating lanthanum oxalate from the second leaching solution to obtain a first mixed solution; precipitating lithium carbonate from the first mixed solution; the second leaching residues are leached with hydrofluoric acid, and third leaching liquid and carbon are obtained; precipitating zirconium oxalate from the third leaching solution to obtain a second mixed solution, and concentrating the second mixed solution to obtain fluosilicic acid. Through heating, step-by-step leaching, a wet process, precipitation separation and the like, valuable metals, silicon and carbon are efficiently separated and recycled, copper and aluminum impurities are removed, the resource utilization rate is effectively increased, and the feasibility of industrialization is remarkably improved.

This invention discloses a method for treating battery black powder and a wastewater treatment device, comprising: reacting battery black powder with a leaching agent to obtain a leachate containing multiple soluble metal salts, wherein the multiple soluble metal salts include lithium; separating the multiple soluble metal salts by means of extraction, and obtaining raffinate wastewater containing the separated lithium; performing a primary pretreatment on the raffinate wastewater; inputting the pretreated wastewater into an oxidation and hydrogen production system for oxidation treatment and electrolytic hydrogen production; performing a secondary pretreatment on the wastewater after oxidation treatment and electrolytic hydrogen production; performing lithium precipitation treatment on the pretreated wastewater; and performing post-treatment on the wastewater after lithium precipitation treatment to meet the required wastewater discharge and / or recyclable material recovery standards; wherein the oxidation and hydrogen production system includes an electrolyzer, a DC power supply, and a hydrogen storage tank.

The invention relates to a method for manufacturing a manganese sulphate component (24) from a manganese-containing material (11) of zinc electrolysis. In the method the manganese-containing material is dissolved (101, 201, 402) in the presence of water (12), sulphuric acid (13) and at least one reducing agent (14) to form a suspension (25); a process solution (15) is formed from the suspension by separating (102, 202, 403) there from a first precipitate (16) containing at least lead (17) and silver (18); metals and / or metal compounds, including one or more of the following: zinc (20), copper (21), is precipitated (103, 203, 408) from the process solution by using at least one sulphide source (19), and a precipitate (23) containing metal sulphides (22) is separated (104, 204, 409) from the process solution, after which the manganese sulphate component formed is suitable for use as a fertiliser (24.1) in agriculture or as an industrial raw material (24.2). Furthermore, the invention also relates to the manganese sulphate component, the use and the product thereof.

A green chemistry hydrometallurgical process for recovering one or more metals from a metal-containing material includes leaching the metal-containing material with formic acid, obtaining a leachate comprising the one or more metals as one or more metal formates, and precipitating at least one of the one or more metal formates. The metal-containing material may be a lithium-ion battery cathode material, resulting in Li formate remaining in solution and precipitation of salts including one or more of Ni, Co, and Mn formates. Steps may include filtration of the leachate, sulphurization of retained metal formate salts to produce metal sulphate salts, purification of filtered leachate by adding lithium carbonate and filtering, dewatering of the purified leachate, and thermal decomposition of resulting lithium salts to produce battery grade lithium carbonate. Carbon dioxide, water, and formic acid may be recovered and reused, without liquid or solid waste produced.

To provide at least one of an industrially applicable manufacturing method of a manganese sulfate solution, that does not generate jarosite and comprises a step of selectively removing potassium from a sulfuric acid acidic manganese solution; and a manufacturing method of manganese oxide using the manganese sulfate solution.SOLUTION: A manufacturing method of a manganese sulfate solution comprises a step of adsorbing a potassium ion on a zeolite by making a molar ratio of silica to alumina be 6 or more, and bringing the manganese sulfate solution containing the potassium ion into contact with the zeolite containing an oxygen 8-membered ring in a skeletal structure.SELECTED DRAWING: None

The invention discloses a process for preparing high-purity manganese sulfate monohydrate by using anisic aldehyde manganese-containing waste liquid. The process comprises the following steps: adding a catalyst and a neutralizing agent to fully react redundant sulfuric acid with manganese powder; transferring the filter-pressed filtrate into an impurity removal kettle, adding a replacement agent, introducing air for oxidation, and removing impurities; adding SDS (sodium dodecyl sulfate) into the filter-pressed filtrate to remove heavy metals in the solution, stirring for 2 hours, and carrying out filter pressing; transferring the solution subjected to filter pressing into an extraction kettle for extraction, and removing alkaline metal ions in the solution; transferring the extracted solution into a decoloring kettle, adding activated carbon for decoloring, removing redundant solvents and organic matters, and filtering to obtain a pure manganese sulfate solution; transferring the purified pure manganese sulfate solution into a crystallization kettle, heating, evaporating and concentrating, and centrifuging by a centrifugal machine to obtain a manganese sulfate monohydrate wet product; and drying and packaging to obtain a high-purity manganese sulfate monohydrate product. According to the process provided by the invention, resources are saved, environmental pollution is avoided, the production cost is reduced, and benefits are increased.

The present disclosure discloses a wet process for recovering valuable metals from a lithium battery. In the method, a waste lithium battery powder is subjected to selective leaching under the condition that a hydrogen sulfide gas is introduced through pressurization, such that Mn2+, Li+, and Al3+ metal ions enter a first-stage leaching liquor and nickel, cobalt, copper, and iron exist in a first-stage leaching residue in the form of a sulfide; then a pH of the first-stage leaching liquor is adjusted to remove aluminum and manganese, which achieves extremely thorough metal separation and leads to relatively pure products; a first-stage leaching residue is subjected to leaching in an acid liquor under a negative pressure, such that the sulfides of nickel, cobalt, iron, and copper are dissolved in a second-stage leaching liquor, and a hydrogen sulfide gas produced can be recycled in the first-stage leaching procedure through pressurization.

The present invention provides a process for preparing a high-purity manganese sulphate solution, comprising the steps of: i) providing an aqueous mixed metal ion solution comprising manganese, cobalt and calcium; ii) extracting manganese and calcium from said aqueous mixed metal ion solution using a first organic phase comprising an alkylphosphorus-based extractant (I) and a first diluent, thereby obtaining a first aqueous raffinate comprising cobalt, and a manganese-and calcium-rich organic phase; iii) stripping said manganese- and calcium-rich organic phase with a mineral acid, thereby obtaining an aqueous solution comprising manganese and calcium; iv) extracting manganese from said aqueous solution obtained in step iii) using a second organic phase comprising an alkylphosphinic acid-based extractant (II) and a second diluent, thereby obtaining a second aqueous raffinate comprising calcium, and a manganese-rich organic phase; and v) stripping said manganese-rich organic phase obtained in step iv) with sulphuric acid, thereby obtaining an aqueous solution comprising manganese sulphate.

The present application belongs to the technical field of extraction equipment structure, and particularly relates to an extraction equipment for recycling waste lithium batteries to prepare manganese sulfate. The present application provides an extraction equipment for recycling waste lithium batteries to prepare manganese sulfate, which can separate and discharge in high resolution without a suction pump in the discharging operation of the upper extraction phase by setting a feeding pipe, a stirring shaft, a bottom stirring motor, a sleeve unit, a pipe column composite unit, a pushing column unit, a one-way stirring column unit, an extraction phase discharge pipe and an aqueous phase discharge pipe on the extraction kettle.