碳化反沉淀法去除硫酸锰浸出液中钙、镁的研究

采用碳化沉锰法去除硫酸锰溶液中的钙、镁离子。以CO₂为碳化剂, 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。考查了CO₂流量、反应温度、pH值及反应时间对钙、镁离子去除效果的影响, 结果表明, 最适宜条件为反应温度45 ℃、溶液pH值7.0、CO₂流量2.7 L/min、反应时间60 min, 此时碳化产物中钙、镁离子含量分别为0.03%和0.01%, 达到了HG/T 2836-2011高纯碳酸锰Ⅰ型品的标准。

Removal of Calcium and Magnesium from Manganese Sulfate Leaching Solution via a Reverse Precipitation by Carbonation

The calcium and magnesium ions in manganese sulfate solution were removed by carbonate precipitation of manganese. With CO₂ as a carbonizing agent, the Mn²⁺ in the manganese sulfate solution was precipitated as manganese carbonate, thus separated from the original solution. The precipitate was then dissolved with sulfuric acid, so as to achieve the purpose of removing impurities. The effects of CO₂ flow rate, reaction temperature, pH value and reaction time on the removal of calcium and magnesium ions were all investigated. The results show that 60-min reaction at an optimal temperature of 45 ℃, with a solution pH of 7.0, a CO₂ flow rate at 2.7 L/min, can result in the calcium and magnesium ion contents in the carbonized product reaching 0.03% and 0.01%, respectively, which is up to the HG/T 2836-2011 Standard for high-purityⅠ-type manganese carbonate products.