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METHOD FOR MIXED ACID LEACHING AND RECOVERY OF POSITIVE ELECTRODE MATERIALS OF WASTE LITHIUM ION BATTERIES
METHOD FOR MIXED ACID LEACHING AND RECOVERY OF POSITIVE ELECTRODE MATERIALS OF WASTE LITHIUM ION BATTERIES
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机译：锂离子电池正极材料的混合浸出和回收方法
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摘要
A method for mixed acid leaching and recovery of metal components in positive electrode materials of waste lithium ion batteries. The method comprises: performing coarse crushing and drying treatment on waste materials; performing pre-leaching on the waste materials by using a mixed acid containing a reduction agent to obtain pre-separated residues; ball milling the pre-separated residues, performing primary leaching and secondary leaching, mixing the primary and secondary leachates and the pre-leachate, adjusting the pH value of the mixture, and performing suction filtration to obtain aluminum hydroxide and raffinate containing cobalt and lithium; adjusting the pH value of the raffinate containing cobalt and lithium at a high temperature, and performing suction filtration to obtain cobalt hydroxide and raffinate containing lithium; concentrating the raffinate containing lithium at a high temperature, and adding a saturated sodium carbonate solution to obtain high-purity lithium carbonate; and recovering aluminum foil. The process utilizes a mixed acid leaching agent, has high leaching efficiency, can acquire high-purity aluminum, aluminum hydroxide, cobalt hydroxide, and high-purity lithium carbonate (the purity being up to 99.9%) step by step, achieves efficient recovery, overall recovery and collaborative recovery of high-value metals in waste lithium-ion batteries, and has a good application prospect.
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