Abstract:Applying spent ternary LIBs anode and cathode pieces as raw materials and carbothermal reduction roasting-water immersion method to theoretically research and analysis pyrolysis separation between cathode active material and Cu-Al foil, reduction of valuable metals (Ni, Co, Mn) and priority extraction of Li through thermodynamics, TG-DSC analysis, combined with XRD, SEM-EDS and other characterization methods. The trend of P and F was also simply analyzed. It is concluded that carbothermic reduction of valuable metal of cathode active material is theoretically feasible, and after XRD and SEM-EDS characterization, valuable metals of Ni, Co and Mn mainly exist in form of metal or metal oxide after roasting, while Li exists in form of Li2CO3, and content of Ni, Co, Mn is unevenly distributed. Under the optimal conditions of carbon content of 27.33%, roasting temperature of 650 ℃ and roasting time of 2.5 h, Li leaching rate is 83.17%, however, separation effect of cathode active material and Cu-Al foil is not very good, which brings certain troubles to subsequent acid leaching purification and recovery of Ni, Co and Mn. The trend of P and F is raw material roasting material water-soaked residue.