三氧化物;
High purity arsenic trioxid was obtained from the 2nd stage filtrate by reduction with SO2 flue gas, freeze crystallization, water dissolving, filtering and refining.
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。
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