基于分子蒸馏原理的高纯铯制备研究

发布时间：2018-12-31 19:00

【摘要】：为了进一步提高原子钟用金属铯的纯度,以99.5%的精铯为原料,采用分子蒸馏的方法提纯金属铯。通过实验研究了蒸馏温度、刮膜器转速、进料速率对金属铯提纯效果的影响,得到最佳的实验条件如下:蒸馏温度控制在490~510 K之间,刮膜器转速设定在180~210 r/min之间,进料速率在3~5 g/min之间。在上述条件下进行实验,结果表明:蒸馏产品中所有的杂质含量均有显著下降,其中钾(K)的含量从690×10~(-6)下降至10~6×10~(-6),铷(Rb)的含量从840×10~(-6)下降至123×10~(-6),该方法能够制得纯度为99.95%的高纯金属铯,满足了铯原子钟对金属铯原料的要求。此外,与普通的真空蒸馏相比,分子蒸馏的蒸馏温度更低,蒸馏时间更短。
[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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