Potential-controlled selective recovery of manganese and cobalt from cobalt slag leaching solution

In this study, manganese and cobalt were selectively separated and recovered from zinc in a leaching solution of cobalt slag by potential-controlled oxidation with ozone. The separation mechanism was discussed. When ozone was pumped into the solution, the manganese (II) was first oxidized and precipitated. After the precipitated manganese is removed from the solution, the cobalt (II) in the solution was oxidized and separated in the same way. Partial zinc was also lost in the precipitates in the form of encapsulated inclusions. The effects of dilution ratio, solution pH values, system temperatures on the manganese and cobalt recoveries were investigated. High recovery rates of cobalt and manganese were achieved, high-grade cobalt precipitate and highly purified liquid were obtained at optimized conditions.