The invention discloses a waste Ni-Co-Mn
lithium manganate positive
electrode material recycling method. The waste Ni-Co-Mn
lithium manganate positive
electrode material recycling method comprises dismantling waste Ni-Co-Mn
lithium manganate batteries, crushing positive
electrode sheets, sieving and reducing crushed materials through
hydrogen in a reducing furnace; washing reduced materials in hotpurified water to obtain washing solution and washed residues, inletting
carbon dioxide into the washing solution to obtain lithium
hydrogen carbonate solution and aluminum
hydroxide precipitates, calcining the aluminum
hydroxide precipitates to obtain ultrafine aluminum
oxide, and pyrolyzing the lithium
hydrogen carbonate solution to obtain battery-level
lithium carbonate; adding the washed residues into hydrazine
hydrate solution, then adding and stirring in
sodium hydroxide for reaction, filtering the mixture to obtain a second filter liquor and second filtered residues, vacuum-
drying thesecond filtered residues inside a
vacuum drying oven, screening and magnetically-separating dried materials to obtain Ni-Co-Mn
ternary alloy powder, or directly dissolving the dried materials in acidto obtain Ni-Co-Mn ternary
mixed solution. The waste Ni-Co-Mn lithium manganate positive
electrode material recycling method is low in cost, capable of achieving separation and recycling of all components, and high in recycling rate and value added of products.