粗（金属）砷真空蒸馏预提纯实验研究

针对含锑粗砷,计算了粗砷中各元素饱和蒸气压,计算结果表明：10-15 Pa、573-773 K条件下,真空蒸馏可以有效地分离粗砷中Fe、Mg、Zn、Pb、Cr、Sb等高于As沸点的金属元素以及沸点明显低于As的以Sx形式存在的S。同时,研究了一次真空蒸馏粗砷、铅-砷合金真空蒸馏粗砷工艺对粗砷中Sb、Bi、S等主要杂质元素的脱除效果。

Experimental Study on Prepurification of Raw Arsenic by Vacuum Distillation

For the antimony existing in raw arsenic,the saturation vapour pressure of elements in raw arsenic was calculated,the results showed that Fe、Mg、Zn、Pb、Cr、Sb etc.,which boiling points are very higher than arsenic＇s,and the S with the existing formation of Sx,which boiling point is lower than arsenic＇s,all those elements could be removed effectively by vacuum distillation process at the condition of 10～15Pa and 573～773K.At the same time,purification effects of main impurity elements,such as Sb、Bi and S in raw arsenic,by adopted the process of vacuum distillation of raw arsenic one time and Pb-As vacuum distillation of raw arsenic,were studied too.