Method for removing elemental copper from ternary battery waste and application thereof

A method for removing elemental copper from a ternary battery waste comprising the following steps:

• (1) crushing and screening the ternary battery waste to obtain a powder, and removing iron from the powder by magnetic separation to obtain an iron-removed ternary waste;
• (2) adding an alkaline solution to the iron-removed ternary waste to perform an aluminum removal reaction, filtering to obtain a filter slag and an aluminum-containing wastewater, washing the filter slag with water and drying to obtain a copper-containing nickel-cobalt-manganese material;
• (3) adding an iron salt solution to the copper-containing nickel-cobalt-manganese material to perform a leaching process, filtering to obtain a filter residue and a leachate containing Fe3+, Fe2+, and Cu2+, washing the filter residue to obtain a nickel-cobalt-manganese waste;
• 4) adding iron powder to the leachate and stirring to perform a reaction, filtering to obtain a copper-removed liquid and a copper residue, washing the copper residue with water and drying to obtain a sponge copper;
• the iron salt solution has a Fe3+ concentration of 5-20 g/L;
• wherein in step (2), an alkali in the alkaline solution and aluminum in the iron-removed ternary waste are in a molar ratio of (1.2-1.5):1;
• and the aluminum removal reaction is carried out at a temperature of 80° C.-100° C.;
• and wherein step (3) further comprises steps of subjecting the nickel-cobalt-manganese waste to acid leaching, impurity removal, extraction and separation to obtain a nickel-cobalt-manganese salt solution, and then recovering nickel, cobalt and manganese.