碳化法去除硫酸锰浸出液中钴、镍的研究

采用碳化法去除硫酸锰溶液中的钴、镍离子。以CO₂为碳化剂，NaOH为pH调节剂，将硫酸锰溶液中的Mn2+以碳酸锰沉淀的形式从原溶液中分离出来，然后用硫酸将沉淀物溶解，从而达到除杂的目的。考察CO₂流量、反应温度、pH值及反应时间对钴、镍离子去除效果的影响。结果表明，反应温度25℃，溶液pH值为7.5，二氧化碳流量为0.9 L/min，反应时间为60 min时最为适宜，此时碳酸锰产品中钴、镍元素含量比硫酸锰一次结晶产物分别降低了0.031 29%和0.088 5%，其含量分别为0.003%和0.005%，符合高纯碳酸锰GB10503-89 I型品的标准。 

Study on Removal of Cobal and Nickel from Manganese Sulfate Leaching Solution by Carbonization Method

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.