Recovery of cobalt from a cobalt-copper oxide ore in Congo by the process of reductive leaching-impurity removal-cobalt precipitation with active magnesium oxide was investigated. The sodium metabisulfite addition method, dosage, leaching reaction time and impurity removal reaction time were investigated, the effect of adding method, dosage and reaction time of cobalt deposition of activated magnesium oxide.
The results show that when the grinding fineness is 70% , the pulp mass concentration is 33% , the pH value of control end point is 1.5-1.8 when sulfuric acid is added, and the sodium metabisulfite is added after 30 min, the pH value of control end point is 1.5-1.8 when sulfuric acid is added, the pH value of control end point is 1.5-1.8 when the pulp mass concentration is 33% , the pH value of control end point is 1.5-1.8 when sulfuric acid is added The leaching rate of cobalt reached 90.38% when the amount of sodium metabisulfite ore was 8kgt and the residual solution after copper extraction was treated with limestone and lime to remove impurities, after adding lime for 3 hours, the precipitation rate of copper was 90.51% , the precipitation rate of iron was 99.23% , the precipitation rate of cobalt was 7.39% After impurity removal, the solution was precipitated with active magnesium oxide, and the addition of active magnesium oxide within 5 minutes after emulsification. When the mass ratio of magnesium oxide to CO was 1.03, and the precipitation time of cobalt was 5 hours, the cobalt precipitation rate reached 90.13% , the resulting cobalt(II) hydroxide sediment meets the requirements of the Industry Grade II standard.
