【摘要】：為了進(jìn)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(guò)實(shí)驗(yàn)研究了蒸餾溫度、刮膜器轉(zhuǎn)速、進(jìn)料速率對(duì)金屬銫提純效果的影響,得到最佳的實(shí)驗(yàn)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(jìn)料速率在3~5 g/min之間。在上述條件下進(jìn)行實(shí)驗(yàn),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(mǎn)足了銫原子鐘對(duì)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(shí)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，

本文編號(hào)：2396984