Recovery of Co, Al, Li and Cu from Wasted Li-Battery

摘要

In this study, the Li battery was disassembled and the metals, such as copper, aluminum, cobalt and lithium, were recovered. Copper was recovered from the negative electrode by thermal treatment process. Sodium hydroxide of 4N was used to dissolve aluminum components from the positive electrode. Then, the pH of solution containing aluminum was adjusted to around 9 to form aluminum hydroxide. The remained positive electrode materials were cleaned and immersed in a mixed solution made of sulfuric acid and hydrogen peroxide to recycle cobalt and lithium. The pH of solution containing cobalt and lithium was adjusted to 5 to remove the impurities, such as ferric, copper and aluminum. After filtration, the electrode position was adopted to obtain metallic cobalt from the filtrate. After electrodes position, sodium carbonate was added into residual solution to obtain lithium carbonate. The recovery rate of copper, aluminum, cobalt and lithium was 99%, 98%, 94% and 70%, respectively. In addition, the wastewater produced from the recovering process was collected and treated with electrochemical and coagulation methods. After 52 hours of electrolysis with 1.43 A/dm~2, the COD value decreases from 968mg/L to 290mg/L. Thereafter, the COD value can be reduced to 38-92mg/L with PAC dosage of 33.3 mg/L.