| Summary: | 碩士 === 國立成功大學 === 資源工程學系 === 107 === With the rapid development of science and technology, human beings have grown their quality of life and demand year by year. Nowadays, lithium-ion battery-related products can be seen everywhere in society. Therefore, the research and development of disposal and reuse of waste lithium batteries are of great importance. In this study, ion exchange and chemical precipitation were used to separate valuable metals. The experiment is divided into three stages. In the first stage, the cathode material in the lithium battery is pretreated and characterized to understand the composition of the raw materials and the crystal phase structure. The second stage is to investigate the experimental parameters of acid leaching. The experimental results show that the reaction is carried out for 3 hours at a reaction temperature of 60 °C using a sulfuric acid concentration of 6 N, a solid-liquid ratio of 70 g/L, and addition of 5 vol.% H2O2. The leaching efficiency of lithium, cobalt, manganese, and nickel are all above 90%. The third stage is the separation and recovery of valuable metals by chemical precipitation and ion exchange. Lithium and manganese are separated and recovered by using sodium carbonate as a precipitating agent. The purity of the manganese and lithium products were 87% and 70%, respectively. Finally, adsorption by ion exchange resin to achieve separation of cobalt and nickel. The recovered cobalt has a purity of 99%.
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