A process for continuously preparing 1,4-dioxyhexacyclic compound includes such steps as proportioning, internally heating for reaction and distillation, supplementing material, discharge, freeze crystallization, centrifugal or adsorptive drying and dissolving at ordinary temp.
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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。
Architecture is an art, music, is the freeze is the crystallization of human intelligence, is a wordless history.
建筑是一门艺术，是凝固的音乐，是人类智慧的结晶，是一部无言的史书。
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