【摘要】：為了進一步提高原子鐘用金屬銫的純度,以99.5%的精銫為原料,采用分子蒸餾的方法提純金屬銫。通過實驗研究了蒸餾溫度、刮膜器轉(zhuǎn)速、進料速率對金屬銫提純效果的影響,得到最佳的實驗條件如下:蒸餾溫度控制在490~510 K之間,刮膜器轉(zhuǎn)速設(shè)定在180~210 r/min之間,進料速率在3~5 g/min之間。在上述條件下進行實驗,結(jié)果表明:蒸餾產(chǎn)品中所有的雜質(zhì)含量均有顯著下降,其中鉀(K)的含量從690×10~(-6)下降至10~6×10~(-6),銣(Rb)的含量從840×10~(-6)下降至123×10~(-6),該方法能夠制得純度為99.95%的高純金屬銫,滿足了銫原子鐘對金屬銫原料的要求。此外,與普通的真空蒸餾相比,分子蒸餾的蒸餾溫度更低,蒸餾時間更短。
[Abstract]:In order to further improve the purity of cesium metal used in atomic clocks, 99.5% of cesium concentrate was used as raw material to purify cesium metal by molecular distillation. The effects of distillation temperature, scrape speed and feed rate on the purification of cesium metal were studied experimentally. The optimum experimental conditions were obtained as follows: the distillation temperature was controlled between 490 鈩，

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