Abstract:In order to separate cobalt from cobalt-rich nickel leaching solution of converter slag, cobalt slag produced from nickel electrolysis purification process of cobalt removing with chlorine was applied as oxidizing agent to remove the cobalt from copper removal solution of converter slag lixivium. The results show that mole ratio of nickel and cobalt in secondary cobalt slag is decreased to 1~1.5 under the following conditions including original mole ratio of nickel and cobalt in cobalt slag of 4~5, reaction temperature of 70~80 ℃, reaction time of 120 min, and pH value of endpoint of 4.8~5. The secondary cobalt slag is used as the raw materials of cobalt product, and cobalt removal solution is returned to nickel electrolysis system.