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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%。
Uranium refining generally graphite crucible, graphite and uranium interaction, uranium carbon content increases, the refining process temperature, time and other factors will undoubtedly affect the uranium solution by carbon. In order to solve this problem, the following experiment has been carried out. Approximately 540 g of uranium pellets were placed in a graphite crucible with an inner diameter of 3 cm and a height of 7 cm. The slab was placed in a small smelting plant and heated by an intermediate frequency power supply. The temperature was maintained at 1320 and 1410 ° C, respectively, and a vacuum of 5 × 10 -2 mn Hg was maintained in the furnace. The temperature of the small hole at the bottom of the crucible was measured with an optical pyrometer and the Pt-PtRh thermocouple was immersed in the bath for proofreading. The temperature measurement error was ± 10 ° C. During the holding period, at regular intervals, through the sampling piston on the top of the furnace, without destroying the vacuum in the furnace, 8-10g of the analysis sample was taken out from the crucible for carbon fixation. The carbon analysis error is ± 10%.