Abstract:Through the combination of pre-removal of impurities and multi-stage roasting, the efficient selective lithium extraction from spent ternary lithium-ion batteries can be realized. The optimum process conditions for carbon thermal reduction were determined by single factor experiments: roasting temperature of 700 ℃ and roasting time of 120 minutes. Under the optimal conditions of reduction roasting, the recovery rate of lithium rises from 85.22% to 92.70% after the removal of organic matter and aluminum foil by pyrolysis, hydraulic stirring, screening, and alkali leaching. Furthermore, the lithium recovery rate can be up to 94.16% by two-stage roasting combined with water leaching.