During the purification stage,the static setting and PbO 2 oxidation were adopted for the removal of Fe and Mn instead of the traditional KMnO 4 oxidation method.

• 把实验室氨法超细活性氧化锌工艺进行中试,净化工序摒弃了传统的高锰酸钾除铁锰,改为静置氧化除铁锰和二氧化铅深度除锰,提高了净化液技术指标。