<正> 铀的精炼一般用石墨坩埚,由于石墨与铀的相互作用,使铀中含碳量增加,精炼过程的温度、时间等因素无疑将影响铀液增碳。为了解决这一问题,曾进行了如下的实验。 于内径3cm高7cm的石墨坩埚内加入约540g铀块,置小型熔炼装置内,通中频电源加热,分别于1320和1410℃保温,炉内保持5×10~(-2)mn Hg真空。用光学高温计测量坩埚底部小孔的温度,并以Pt-PtRh热电偶浸入熔池进行校对,测温误差为±10℃。于恒温保持期间,每隔一定时间,通过炉顶上的取样活塞,在不破坏炉内真空的条件下从坩埚中取出分析试样8—10g,供定碳用。碳的分析误差为±10%。
An investigation was undertaken to obtain a better understanding of the increase of carbon contamination in uranium during refining with graphite crucible. The results,indicate that the increasing rate of carbon content, c, in uranium melt with respect to refining time, t, may be proposed as:dc/dt=ks(1-c/c_s) where k—constant, s—specific contact surface between melt and graphite crucible,c_s—solubility of carbon in uranium melt.
参考文献
[1] | Ward, R. C., J. Iron Steel Inst., 201 (1963) , 11 |
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