电解锰工业生产过程中镁组分迁移行为研究

Migration Behavior of Magnesium Components in Industrial Production of Electrolytic Manganese

为明晰电解锰工业生产中杂质镁的迁移行为,模拟工业生产条件,对各生产工序中镁组分含量变化规律和平衡分布情况进行了研究。结果表明,在浸出温度50℃、酸矿比0.42、浸出时间4 h、净化除铁温度80℃、电解温度38~42℃、槽内pH=7.0~7.4、槽电压4.0~4.1 V条件下,电解锰生产中杂质镁主要在浸出工序进入生产体系,浸出后99.32%的镁进入下段工序;镁的开路外排主要在合格液静置工序,外排比例达到16.34%;其次为净化工序和浸出工序,外排比例分别为3.22%和0.68%;电解工序镁离子几乎没有外排。工业生产中可以考虑通过合格液静置阶段有序结晶的方式来实现杂质镁脱除。

In order to clarify the migration behavior of magnesium impurity in industrial production of electrolytic manganese, the variation law and equilibrium distribution of magnesium content at each stage of production were investigated by simulating industrial production conditions. The results show that under the conditions, including a leaching temperature of 50 ℃, acid to ore ratio of 0.42, a leaching time of 4 h, 80 ℃ for purification and iron removal, 38-42 ℃ for electrolysis, a pH value of 7.0-7.4 in the cell and a cell voltage of 4.0-4.1 V, the magnesium impurity in the electrolytic manganese production mainly enters the production system at the stage of leaching process, and 99.32% of the magnesium enters the next stage after leaching. The magnesium in an open circuit flowsheet is principally discharged at the stage of standing still of qualified solution, followed by purification stage and leaching stage, with the discharging proportion of 16.34%, 3.22% and 0.68% respectively. There is almost no discharge of magnesium ions during electrolysis process. Consequently, it is suggested that magnesium in industrial production be removed by orderly crystallization at the stage of standing still of qualified solution.