| Summary: | 碩士 === 朝陽科技大學 === 環境工程與管理系 === 104 === This study focused the ternary metals recycling from scrap secondary lithium batteries and explored the best operation parameters. By varied pH of extractants (P204 and P507) and metal acid solution, the affinity between extractants and different metal ions was change. The different affinity results the separation and purification of different metal ions. The four major separated targets are Co, Mn, Ni, Li, respectively. Cobalt is the most expensive one and it’s also the key metal for purification. The major results can be divided into five parts:
1. The optimum extraction ratio among different saponification degree of 10-90%: In P204 system with saponification degree of 70%, the single extraction ratio of Mn was 49.5%. The extraction ratios of Co, Ni and Li were all less than 2%. In P507 system with saponification degree of 50%, the single extraction ratio of Co was 54%. The extraction ratios of Ni and Li were all less than 3%.
2. The optimum extraction ratio among different O/A ratio of 1:4, 2:3, 1:1, 3:2, and 4:1: In P204 system with O/A ratio of 1:1, the single extraction ratio of Mn was 42%. The extraction ratios of Co, Ni and Li were all less than 2%. In P507 system with O/A ratio of 1:1, the single extraction of Co is 30%. The extraction ratios of Ni and Li were all less than 3%.
3. The optimum extraction conditions among different extractant concentration of 20 to 80%: In P204 system with extractant concentration of 20%, the single extraction ratio of Mn was 64%. The extraction ratios of Co, Ni and Li were all less than with other extractant concentration. In P507 system with extractant concentration of 20%, the single extraction of Co is 58%. The extraction ratios of Ni and Li were all less than 6%.
4. The optimum extraction parameters in single-stage extraction: In P204 system, the single extraction ratio of Mn was 61%. The extraction ratios of Co, Ni, and Li were all less than 10%. In P507 system, the single extraction ratio of Co was 55%. The extraction ratios of Ni and Li do not exceed 5%. The ternary metals of Co, Mn and Ni can be separated and purified by subsequent multi-stage extraction.
5. The optimum extraction conditions of the multi-stage countercurrent extraction (three-stage of P204 and six-stage of P507): In P204 system, three-stage countercurrent extraction ratio of Mn is 95%. Total losses of Co, Ni, and Li were less than 10%, respectively. In P507 system, six-stage countercurrent extraction ratio of Co is 95%. Total losses of Ni, and Li were less than 10%, respectively.
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