METHOD FOR PURIFYING NICKEL-COBALT-MANGANESE LEACHING SOLUTION

The present invention belongs to the field of hydrometallurgy. Disclosed is a method for purifying a nickel-cobalt-manganese leaching solution. The method comprises the following steps: heating a nickel-cobalt-manganese leaching solution, adding a manganese powder thereto, adjusting the pH, reacting same, and filtering same to obtain iron-aluminum slag and a liquid with iron and aluminum removed therefrom; heating the liquid with iron and aluminum removed therefrom, adding a manganese powder thereto, adjusting the pH, reacting same, and filtering same to obtain copper slag and a solution with copper removed therefrom; heating the solution with copper removed therefrom, adding an alkaline solution thereto, adjusting the pH, reacting same, and filtering same to obtain a nickel-cobalt-precipitated solution and nickel-cobalt-manganese hydroxide; and adding water into nickel-cobalt-manganese hydroxide for slurrying, heating same, adding an acidic solution for dissolution, adjusting the pH, reacting same, heating same, adding a manganese powder thereto, adjusting the pH, and filtering same to obtain iron-aluminum slag and a nickel-cobalt-manganese sulfate solution which is up to standard. According to the present invention, firstly, ferrous iron in the solution system is oxidized using a manganese oxide ore, the pH value thereof is adjusted with a manganese carbonate ore by means of neutralization, iron and aluminum are removed, residual acid in the solution system is consumed, and manganese carbonate ore is also leached out for producing manganese sulfate.