METHOD FOR COMPREHENSIVE EXTRACTION OF METALS FROM SPENT LITHIUM-ION BATTERIES

摘要

Disclosed is a method for the comprehensive extraction of metals from spent lithium-ion batteries. The steps of the method comprise, in sequence, acid dissolution (S1), alkalization and impurity removal (S2), extraction 1 (S3), extraction 2 (S4), extraction 3 (S5), electrodeposition (S6), purification and refinement (S7), and purification and preparation (S8). A raffinate 1 and a copper sulfate solution are obtained by means of the extraction 1 (S3) step, and the copper sulfate solution is subjected to the electrodeposition (S6) to obtain negative electrode copper; the raffinate 1 is subjected to the extraction 2 (S4) step to obtain a raffinate 2 and a manganese sulfate solution, and the manganese sulfate solution is subjected to the refinement (S7) to obtain a battery-grade manganese sulfate solution; and the raffinate 2 is subjected to the extraction 3 (S5) step to obtain a raffinate 3 and a battery-grade Ni-Co mixed solution, and the raffinate 3 is subjected to the purification and preparation (S8) to obtain battery-grade lithium carbonate. By means of the three extractions stage by stage, the copper, battery-grade Ni-Co mixed solution, battery-grade manganese sulfate solution and battery-grade lithium carbonate are recovered in sequence, thereby achieving the comprehensive recovery of multiple metal elements from spent lithium-ion batteries and increasing the overall metal recovery rate.