Abstract
In this study, we manufacture cobalt metal and electronic manganese dioxide from spent Li-ion batteries leaching solution which contains 21g/L cobalt, 0.46 g/L manganese, 2.5g/L nickel and 3.6g/L lithium. In first step, solvnet extraction process was applied to recover cobalt and manganese from nickel and lithium. In solvent extraction, the pure and concentrated cobalt and manganese were recovered by the experiments such as pH-isotherm, effect of saponification of 2-ethylhexyl phosphonic acid, McCabe-Thiele diagram, counter current simulation test. In second process, the electro chemical process was applied to simultaneously manufacture cobalt metal and electro manganese dioxide. The experiments were conducted such as effect of concentration of cobalt and manganese, effect current destiny, pH, effect of temperature. As result, the concentration of Mn is not affect the purity of cobalt metal which is over 99.8%. Also, for high current efficiency and low energy consumption of deposition of Co on cathode, the most important factors are pH and concentration of cobalt. Therefore, this study will contribute to recovery process of cobalt and manganese because of advantage for simultaneous recovery of Co and Mn at one energy consumption.
