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.