硫酸锌溶液冷却结晶除钙镁生产实践

Practice of calcium and magnesium removal by cooling crystallization of zinc sulfate solution

对几种不同的除钙镁工艺进行了对比分析,研究了冷却沉降法除硫酸锌溶液中的Ca、Mg,实验表明,冷却沉降法是一种节能、高效的工艺方案,控制温度25℃、pH=3.8～4.5、晶种加入量4 g/L、沉降时间100 min,可获得较好的工艺指标。

Several different processes of removing calcium and magnesium were contrasted and analyzed,and the removal of Ca and Mg in zinc sulfate solution by cooling-sedimentation method was studied.The test result showed that the cooling-sedimentation method was an energy-saving and high efficiency process scheme,and it can realize good process index under the condition of control temperature at 25℃,pH value at 3.8～4.5,adding 4 g/L seed crystal,sedimentation time for 100 min.