硫化锌精矿焙烧矿的中性浸出渣常含有锗等有价元素，常规低酸高酸两段浸出流程锗的直收率低。
Neutral leaching residue of roasted zinc concentrate often contains germanium which is poorly recovered in conventional two-stage leaching.
重点探讨了酸料比，低温被烧段温度及时间，高温焙烧段温度及时间对镍钴浸出率的影响。
The effects of acid to materials ratio, roasting temperature and time in low roasting action and high roasting action on the Ni and Co leaching were investigation, respectively.
二段浸出后的滤液用二氧化硫烟道气还原，还原液经冷冻结晶、水溶、过滤、精制后可得纯度较高的精白砷。
High purity arsenic trioxid was obtained from the 2nd stage filtrate by reduction with SO2 flue gas, freeze crystallization, water dissolving, filtering and refining.
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