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用鋅汞齐还原鈾(Ⅵ)溶液是一种常用的方法,卽应用琼斯还原器,还原时形成三价和四价的鈾混合物,接着需經过通空气氧化这一手續,因而使操作較为不便。用金属鉍来还原,仅有极少量三价鈾形成,还原后之鈾溶液,攪拌一、二分钟,能使三价鈾完全氧化为四价。鉍比鎘更佳,在几个当量浓度硫酸介貭中还原时不产生气泡,可防止堵塞还原柱,不致影响流速。
Reduction of uranium (Ⅵ) solution with zinc amalgam is a commonly used method, 卽 the use of Jones restorer, reducing the formation of trivalent and tetravalent uranium mixture, followed by the air through the air through the process, so that the operation is more Inconvenient With metal bismuth to restore, only a very small amount of trivalent uranium formation, reduction of uranium solution, stirring for a minute or two, can make three uranium completely oxidized to tetravalent. Bismuth is better than cadmium, in a few equivalents of sulfuric acid mediated reduction does not produce bubbles, can prevent the plug reduction column, will not affect the flow rate.