Method for recovering valuable metals from lithium secondary battery wastes
AssigneeLs-Nikko Copper Inc.
InventorsChong Ho Sonu, Min Jae Lee, Sung Chen Ahan, Byoung Kook Jeon, Bo Eun Kim
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Abstract
Valuable metals such as cobalt, nickel, manganese, and lithium can be economically recovered from various lithium secondary battery-related wastes by the inventive method which comprises liquid-phase leaching a scrap powder containing Co, Ni, Mn, and Li, and purifying and solvent-extracting the resulting leaching solution to recover each of said Co, Ni, Mn, and Li, wherein the liquid-phase leaching is performed by a two-step counter-current leaching using an inorganic acid solution or a mixed solution of an inorganic acid and hydrogen peroxide.
Claims5
A method for recovering valuable metals comprising:
- liquid-phase leaching a scrap powder containing Co, Ni, Mn, and Li;
- purifying and solvent-extracting the resulting leaching solution to recover each of said Co, Ni, Mn, and Li,
- wherein the liquid-phase leaching is performed by a two-step counter-current leaching using an inorganic acid solution or a mixed solution of an inorganic acid and hydrogen peroxide, and
- wherein the purifying the resulting leaching solution is performed by adding CaCO3 to the resulting leaching solution, adjusting a pH of the resulting leaching solution to 4.5 to 5.0 by adding a dilute NaOH solution thereto, further adding NaSH thereto, and then filtering the resulting leaching solution.
Dependencies are inferred from the claim text.