The invention provides a method for mixed acid leaching and 
recovery of 
metal components of positive pole materials of waste and old 
lithium ion batteries. The method comprises carrying out coarse crushing on wastes, 
drying the crushed wastes, pre-leaching the wastes through a mixed acid containing a reduction agent to obtain pre-separated residues, carrying out ball milling, carrying out primary and secondary leaching, mixing the primary and secondary leachates and the pre-
leachate, adjusting pH of the mixture, carrying out suction 
filtration to obtain aluminum 
hydroxide and 
raffinate containing 
cobalt and 
lithium, adjusting pH of the 
raffinate containing 
cobalt and 
lithium at a high temperature, carrying out suction 
filtration to obtain 
cobalt hydroxide and 
raffinate containing lithium, carrying out concentration on the raffinate containing lithium at a high temperature, adding a saturated 
sodium carbonate solution into the concentrate to obtain high purity 
lithium carbonate, and recovering 
aluminum foil. The method utilizes a mixed acid leaching agent, has high leaching efficiency, can gradually acquire high purity aluminum, aluminum 
hydroxide, 
cobalt hydroxide and high purity 
lithium carbonate (having purity of 99.9%), realizes efficient 
recovery, overall 
recovery and collaborative recovery of high-value metals in the waste and old lithium-
ion batteries and has a good application prospect.