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

Proposed is a solvent extraction method using two-stage extraction for separation and recovery of nickel, cobalt, and manganese. More specifically, the method relates to a two-stage extraction-based solvent extraction method for separately recovering nickel, cobalt, and manganese from a starting material containing nickel, cobalt, and manganese. The method includes a first solvent extraction step in which manganese is recovered from the starting material and a second solvent extraction step in which nickel and cobalt are extracted from the starting material so that three kinds of valuable metals can be separately recovered.

A method for separating metal by solvent extraction synergized complexation is provided. The method includes: extracting an aqueous phase metal complex with an oil phase extractant; obtaining an extracted oil phase and a raffinate aqueous phase; stripping the extracted oil phase to obtain a first metal solution; and precipitating or electrolyzing the first metal solution to recover a first metal. Wherein, the aqueous phase metal complex includes a first metal complex and a second metal complex. The first metal complex includes a first metal ion and a first ligand ion. The second metal complex includes a second metal ion and a second ligand ion. The first metal ion differs from the second metal ion. Wherein, the oil phase extractant includes at least one of a diluent and an auxiliary agent and the oil phase extractant is saponified by a saponification agent before or in the extracting step.

Disclosed in the present invention is a method for extracting valuable metal from low-matte nickel converter slag. The method comprises: mixing low-matte nickel converter slag and quicklime then calcinating, obtaining a calcinated material; grinding and magnetically separating the calcinated material, obtaining silicate and iron-rich slag; adding a strong alkali solution to the iron-rich slag to perform leaching processing, and performing solid-liquid separation, obtaining a filtrate and a residue; mixing the residue with an acid solution, performing oxygen pressure acid leaching, and performing solid-liquid separation, obtaining a leachate and iron oxide; introducing hydrogen sulfide gas into the leachate, adjusting the pH, and performing solid-liquid separation, obtaining a copper sulfide precipitate and a nickel-cobalt-containing filtrate. In the present invention, first, removing silicon dioxide is removed by means of calcination to prepare silicate, then iron oxide is prepared by means of acid leaching, and finally metal separation is performed on the leachate, causing various components of the converter slag to be effectively utilized. The process flow of the present invention is short and effectively utilizes each component of the low-matte nickel converter slag, waste is turned into valuable material, and the loss of valuable metal elements is reduced.

The invention relates to hydrometallurgical method for recovering metals from spent energy storage devices. The method comprises combining aqueous hydrobromic acid leach solution and an electrode material of spent energy storage devices in a reaction vessel, dissolving the metals contained in the electrode material to form soluble metal bromide salts, removing elemental bromine, if formed, from the reaction vessel, separating insoluble material, if present, from the leach solution to obtain a metal-bearing solution and isolating one or more metals from said metal-bearing solution.

A process for selectively extracting cobalt from a composition comprising cobalt and one or more other metal elements, wherein the process comprises the following steps: a) a step of forming a precipitate consisting of a coordination complex comprising cobalt, by bringing the solution into contact with at least one aromatic compound comprising at least two nitrogen atoms in its ring; b) a step of recovering the precipitate.

A method of recycling Ni and/or Co from a functional material such as a battery or catalyst material, the method comprising: forming an acidic aqueous recycling feed of the functional material by acid leaching the functional material or a derivative thereof, the acidic aqueous recycling feed comprising Ni and/or Co in solution; contacting the acidic aqueous recycling feed with an organic solvent extraction composition; and extracting one or both of Ni and Co from the acidic aqueous recycling feed into the organic solvent extraction composition, wherein the organic solvent extraction composition comprises: an organic solvent which is immiscible with the acidic aqueous recycling feed; a picolinic acid ester or picolinic acid amide which is soluble in the organic solvent; and a phase transfer catalyst.

A method for regenerating raw materials of waste Nickel-Cadmium batteries based on solvent extraction is disclosed. The method is used for disassembling, rinsing and shredding industrial waste from Nickel-Cadmium batteries. The solvent extraction technology is easy for large-scale and continuous production, and valuable metals such as cadmium, cobalt and nickel are extracted from the waste Nickel-Cadmium batteries to prepare products such as cadmium nitrate, cobalt nitrate, nickel nitrate which are directly used for producing raw materials for Nickel-Cadmium batteries. No new waste salt and waste residues are generated in the process. High-efficiency separation and purification of all valuable metals during the regeneration of waste Nickel-Cadmium batteries and the full-life cycle regeneration cycle of Nickel-Cadmium batteries are achieved.

A process is divulged for recovering metals from a metal-bearing material containing, in oxidized form, more than 1% of Co, a total of Co and Ni of more than 15%, and more than 1% Mg, comprising smelting said metal-bearing material in a bath furnace together with slag formers, thereby producing an alloy phase with more than 80% of the Co, and less than 1% of the Mg, and a slag phase, by applying reducing smelting conditions, and by selecting CaO, SiO.sub.2, and Al.sub.2O.sub.3 as slag formers, in amounts to obtain a final slag composition according to the ratio's 0.25<SiO.sub.2/Al.sub.2O.sub.3<2.5, 0.5<SiO.sub.2/CaO<2.5, and MgO>10%; and separating the alloy phase from the slag phase. This process ensures quantitative recovery of Co in an alloy phase along with other metals such as Ni, while collecting Mg into a slag.

Disclosed is a process for the selective separation and recovery of metal values from process liquors, in particular for the selective recovery of mixed metal sulfates, such as a mixed cobalt-nickel sulfate, from a metal sulfate process liquor.