Method for simultaneously recovering cobalt and manganese from lithium based battery
The present invention relates to a method of simultaneously recovering cobalt (Co) and manganese (Mn) from lithium-based BATTERY, and more particularly, to a method that is capable of simultaneously recovering cobalt and manganese from lithium-based BATTERY, i.e., recycled resources that contain large amounts of cobalt and manganese, with high purities using multistage leaching and electrowinning methods. According to the method of the present invention, cobalt and manganese can be simultaneously recovered from lithium-based BATTERY as recycled resources, and a recovery method that is cost-effective compared to conventional methods can be provided.
1. A method of simultaneously recovering cobalt and manganese from a lithium-based battery, the method comprising:
(1) heat-treating the lithium-based battery;
(2) grinding the heat-treated battery to obtain ground particles, and separating particles having a particle size of 12 mesh or less from the ground particles;
(3) subjecting the separated particles to multistage leaching;
(4) adding 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (PC88A) to a product of the multistage leaching to obtain an electrowinning solution;
(5) subjecting the electrowinning solution to electrowinning using circulation-type electrodes, the electrodes including a cathode made of stainless steel and an anode made of a 93% Pb-7% Sn alloy, wherein the electrowinning is performed in an electrolytic cell at a pH of 2 or more, a current density of 0.025-0.065 A/cm2 and temperature of 30-60° C.; and
(6) washing and simultaneously recovering cobalt metal and electrolytic manganese dioxide (EMD).
2. The method of claim 1 , wherein the lithium-based battery comprises a lithium-ion battery and a lithium primary battery.
3. The method of claim 1 , wherein a concentration of cobalt ions in the electrowinning is 15-20 g/L or higher.
4. The method of claim 1 , wherein the washing is performed using sulfuric acid.