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一、前言挥发分离法是利用化合物的挥发性差异来进行分离的方法。由于该法的选择性较高,容易掌握,不需要很复杂的仪器和设备,因此在某些情况下,具有很大的意义。前人在除去各种矿石中的铋时,采用了氢溴酸在较高温度下形成BiBr_3挥发除去铋的干扰。但是至目前为止不见有人利用这一性质来进行铋的定量挥发分离及其测定。本文主要研究利用溴化铵或溴化铵—高硫酸铵作熔剂,在500—600℃加热使试样中各种形态铋分解,并同时以BiBr_2蒸出而凝聚于熔样管壁上,凝聚物用热稀硝酸冼下,
I. Introduction Volatile separation is the use of volatile compounds to separate the method of separation. Due to the high selectivity and easy access of the law, it does not require complicated instruments and equipment and is therefore of great significance in some cases. Former removal of bismuth in various ores, the use of hydrobromic acid at higher temperatures to form BiBr_3 volatilization of bismuth interference. However, so far no one has used this property to quantify volatile separation of bismuth and its determination. In this paper, the main research using ammonium bromide or ammonium bromide - ammonium sulfate as a flux, heated at 500-600 ℃ in the sample of various forms of bismuth decomposition, and at the same time BiBr_2 steam condensate condensed in the wall of the tube, aggregation Material was diluted with hot dilute nitric acid,