Abstract: The carbonization method was used to remove cobalt and nickel ions from the manganese sulfate solution. Mn²⁺ in the manganese sulfate solution was separated from the original solution in the form of manganese carbonate precipitation with the carbonizing agent of CO₂, pH adjuster of NaOH. Then the precipitate was dissolved with sulfuric acid to remove impurities. The effects of CO₂ flow rate, reaction temperature, pH value and reaction time on the removal of cobalt and nickel ions were investigated. The optimal experimental conditions with the reaction temperature of 25 ℃, the solution pH of 7.5, the carbon dioxide flow rate of 0.9 L/min, and the reaction time of 60 min were adopted. Under these conditions, the content of cobalt and nickel in the carbonized product was reduced by 0.03129% and 0.0885% compared with the primary crystallization product of manganese carbonate. The remaining amounts were 0.003% and 0.005%, respectively, which was in line with the standard of high-purity manganese carbonate GB 10503-89 type I product.