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.
本研究突破了在高硅铜冶渣湿法浸出回收有价金属过程中容易形成硅胶所造成难过滤的瓶颈；
This study is not only a breakthrough the bottleneck of silica gel formation and pulp filtration, but also a good removal iron and silicon completely, and a filterable cake is obtained.
其特征在于 采用常压加酸预浸、再加压氧浸出，将羰化合成残渣中的贱金属浸出，过滤分 离得到固体贵金属精矿。
The process is acid adding pre-leaching at normal pressure, pressurized oxygen leaching to leach out base metals and filtering separation to obtain solid noble metal concentrate.
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