A process has been developed in order to recover and recycle the metals present in spent batteries, including alkaline spent batteries alone or mixed with other types of spent batteries. This method shows a good potential in terms of metals recoveries efficiencies and economic feasibility. Firstly, the spent batteries are crushed (optionally after having been frozen in the case of spent batteries of mixed types). Then, the undesirable parts (plastics, steel cases, papers, etc.) are removed by screening. The collected powder, containing the metals, is mixed with a solution of sulfuric acid in the presence of a reducing agent. The solid/liquid separation is carried out by filtration and the leachate is purified in order to selectively recover the metals. The purification steps consist of: a) recovering Zn by solvent extraction followed by an electrowinning process; b) simultaneously recovering Mn and Cd by solvent extraction process; c) selectively recovering Cd from the mixture solution of Cd and Mn by electrowinning process; d) precipitating Mn from a pure solution of MnSO.sub.4 in a carbonate form; e) removing the impurities present in the effluent by solvent extraction in order to obtain a pure NiSO.sub.4 solution; f) precipitating Ni from a NiSO.sub.4 solution in a carbonate form.

The present description relates to a process for producing magnesium metal from magnesium-bearing ores using serpentine. The process described herein consists generally in a mineral preparation and classification followed by leaching with dilute hydrochloric acid. The slurry is filtered and the non-leached portion, containing amorphous silica is recovered. The residual solution is neutralized and purified by chemical precipitation with non activated and activated serpentine. The nickel is also recovered by precipitation at higher pH. A final neutralisation and purification step of magnesium chloride solution by precipitation allows eliminating any traces of residual impurities. The purified magnesium chloride solution is evaporated until saturation and the MgCl.sub.2.6H.sub.2O is recovered by crystallization in an acid media. The salt is dehydrated and subsequent electrolysis of anhydrous magnesium chloride produces pure magnesium metal and hydrochloric acid.

The invention relates to a process for leaching metals from metal sulfide ore and/or concentrate, comprising: electrolytically generating a leach solution of oxidative halogen-based lixiviant; contacting the metal sulfide ore and/or concentrate with the leach solution of oxidative halogen-based lixiviant to produce a metal-bearing solution; and passing the metal-bearing solution to metal separation.

The present invention refers a method of recovering materials derived from nickel ore, involving a method of obtaining nickel ore concentrate and a processing method of said concentrate, whereby nickel ore can be processed in an efficient and ecological manner, and residues and materials currently untapped can be recovered from this nickel ore.

Cathode material from exhausted lithium ion batteries are dissolved in a solution for extracting the useful elements Co (cobalt), Ni (nickel), Al (Aluminum) and Mn (manganese) to produce active cathode materials for new batteries. The solution includes compounds of desirable materials such as cobalt, nickel, aluminum and manganese dissolved as compounds from the exhausted cathode material of spent cells. Depending on a desired proportion, or ratio, of the desired materials, raw materials are added to the solution to achieve the desired ratio of the commingled compounds for the recycled cathode material for new cells. The desired materials precipitate out of solution without extensive heating or separation of the desired materials into individual compounds or elements. The resulting active cathode material has the predetermined ratio for use in new cells, and avoids high heat typically required to separate the useful elements because the desired materials remain commingled in solution.

Disclosed are a sealed cobalt leaching device, a reagent for the cobalt leaching, a method using the device, and use of the method. The sealed cobalt leaching device includes a base, where a top of the base is provided with a first groove; a chemical solution holding tool is provided above the base; a bottom of the chemical solution holding tool is removably connected to the base; a holding through-hole penetrating up and down is formed inside the chemical solution holding tool; and a sealing cover is provided above the chemical solution holding tool. Beneficial effects of the present disclosure: Through the combination of the base, the chemical solution holding tool, and the sealing cover, the holding through-hole inside the chemical solution holding tool is sealed, thereby improving the cobalt leaching temperature and the cobalt leaching efficiency.

Cathode material from exhausted lithium ion batteries are dissolved in a solution for extracting the useful elements Co (cobalt), Ni (nickel), Al (Aluminum) and Mn (manganese) to produce active cathode materials for new batteries. The solution includes compounds of desirable materials such as cobalt, nickel, aluminum and manganese dissolved as compounds from the exhausted cathode material of spent cells. Depending on a desired proportion, or ratio, of the desired materials, raw materials are added to the solution to achieve the desired ratio of the commingled compounds for the recycled cathode material for new cells. The desired materials precipitate out of solution without extensive heating or separation of the desired materials into individual compounds or elements. The resulting active cathode material has the predetermined ratio for use in new cells, and avoids high heat typically required to separate the useful elements because the desired materials remain commingled in solution.

A process for using acid to leach metals from metal silicate, oxide, or oxide-hydroxide feedstock with subsequent alkalinization of the leach liquor, thereby bringing target metal ions into solution and separating the metals as hydroxides, oxides, or oxide-hydroxides. Electrodialysis is used to recycle acid and base in the process. Configurations of the electrochemical cell and means of combining cells in stacks and in series are provided that enable production of acid at high concentration allowing for decreased reactor volumes for leaching and precipitation and improved solid/liquid separation characteristics of the leached slurry.

Processes are provided in which successive steps of hydrometallurgical value extraction may be carried out using the products of carbon capture and an electrolytic reagent-generating process. The electrolytic process provides an acid leachant and an alkali hydroxide, with the alkali hydroxide then available for use either directly as a precipitant in the hydrometallurgical steps, or available for conversion by carbon capture to an alkali metal carbonate that can in turn be used as the precipitant in the selective hydrometallurgical steps.

A cyclone high-speed electrolyzer using the high-speed turbulence, a method for recovering a valuable metal using the same, and a valuable metals recovered therefrom are provided, by applying a cyclone high-speed electrolytic recovery method to suppress the increase in concentration polarization caused by the rise in activation polarization and the growth of the diffusion layer, which are issues of conventional electrolytic recovery methods. In the cyclone high-speed electrolytic recovery method, a helical downward vortex is generated along the wall of the cyclone electrolyzer to accelerate the electrolyzer at high speed, forming a high-speed turbulent flow. This high-speed turbulence reduces the diffusion layer, significantly improving electrolytic efficiency and remarkably increasing the recovery rate of valuable metals.