A nickel recovery process capable of decreasing nickel remaining in a byproduct by recovering nickel from the byproduct of electrolytic nickel manufacturing process by chlorine-leaching, and also, capable of simplifying a cementation step simultaneously, is provided. In a nickel recovery step S60, a nickel recovery step S70 and a nickel recovery step S80, nickel is recovered in each step from S.sup.0 slurry, residue flaker and chlorine-leached residue, which are byproducts of electrolytic nickel manufacturing process by chlorine-leaching, by using an aqueous solution containing 80 g/L to 390 g/L of chlorine and 30 g/L to 70 g/L of copper.

Methods and systems for producing low carbon intensity hydrogen during electrorefining or electrowinning processes to purify raw metals are provided. The method may include causing an electrorefining or electrowinning process in an electrorefining or electrowinning cell so as to deposit a purified metal at a cathode of the cell. The cell may include one or more anodes, one or more cathodes, and an electrolyte or leaching solution comprising the metal to be purified. The cell may also include an electrical source electrically coupled to the one or more anodes and cathodes such that when the electrical source is operated under electrical potential, the purified metal is deposited at the one or more cathodes from the solution and hydrogen gas is generated. The method may further include operating the cell under one or more operating parameters selected to increase hydrogen gas generation during the electrorefining or electrowinning process.

Methods and systems for producing low carbon intensity hydrogen during electrorefining or electrowinning processes to purify raw metals are provided. The method may include causing an electrorefining or electrowinning process in an electrorefining or electrowinning cell so as to deposit a purified metal at a cathode of the cell. The cell may include one or more anodes, one or more cathodes, and an electrolyte or leaching solution comprising the metal to be purified. The cell may also include an electrical source electrically coupled to the one or more anodes and cathodes such that when the electrical source is operated under electrical potential, the purified metal is deposited at the one or more cathodes from the solution and hydrogen gas is generated. The method may further include operating the cell under one or more operating parameters selected to increase hydrogen gas generation during the electrorefining or electrowinning process.

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.

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 method for extracting metal ions from water is provided that includes disposing two electrically conductive electrodes in water, where the water includes a target ion species in solution, where at least one of the electrically conductive electrodes is a functionalized electrode having species-specific adsorption of the target ion species, and providing electrical current to the electrically conductive electrodes such that the one or more target ion species are deposited to metallic form or metal oxides at the functionalized electrode by one or more electrochemical reactions.

A method for extracting metal ions from water is provided that includes disposing two electrically conductive electrodes in water, where the water includes a target ion species in solution, where at least one of the electrically conductive electrodes is a functionalized electrode having species-specific adsorption of the target ion species, and providing electrical current to the electrically conductive electrodes such that the one or more target ion species are deposited to metallic form or metal oxides at the functionalized electrode by one or more electrochemical reactions.

A method of removing impurities using an electrochemical membrane apparatus comprising introducing a leaching solution into an electrochemical membrane reactor. The leaching solution of the electrochemical apparatus comprises copper, aluminum, iron, cobalt, manganese, and nickel. The electrochemical membrane reactor comprises at least one positive electrode and at least one negative electrode, and the leaching solution is in contact with the at least one negative electrode. A current is applied through the electrochemical membrane reactor to adjust a pH of the leaching solution and copper is deposited on the at least one negative electrode. The aluminum and the iron are removed from the leaching solution, and the cobalt, the manganese, and the nickel are recovered from the leaching solution. An electrochemical membrane apparatus including an electrochemical membrane reactor is also disclosed.

A metal recovery method includes causing a metal recovery device including a power source, an electronic load, an electrolytic solution, a first tank that includes an anode, a first supply port for H.sub.2O and a first discharge port and that is immersed in the electrolytic solution, the anode being connected to the power source and the electronic load and containing at least Co, and a second tank that includes a cathode, a second supply port for H.sub.2O and a second discharge port and that is immersed in the electrolytic solution, the cathode being connected to the power source and the electronic load, to recover Co eluted from the anode by maintaining voltage by the power source and the electronic load such that a potential of the anode is higher than a potential of the cathode.

A metal recovery method includes causing a metal recovery device including a power source, an electronic load, an electrolytic solution, a first tank that includes an anode, a first supply port for H.sub.2O and a first discharge port and that is immersed in the electrolytic solution, the anode being connected to the power source and the electronic load and containing at least Co, and a second tank that includes a cathode, a second supply port for H.sub.2O and a second discharge port and that is immersed in the electrolytic solution, the cathode being connected to the power source and the electronic load, to recover Co eluted from the anode by maintaining voltage by the power source and the electronic load such that a potential of the anode is higher than a potential of the cathode.