通过理论计算分析了区域熔炼过程中熔化区域宽度、区熔次数等对U提纯效果的影响.实验采用理论优化条件,以U中Al、Mo、W、Ni、Ca、C等元素为研究对象,利用原子发射光谱(ICP-AES)和金相(OM)分析了提纯前/后铀中杂质元素的浓度、夹杂物分布特点.结果表明:区域熔炼法对铀中杂质元素有一定的去除作用,试棒中部的待测杂质总量从1189 μg/g降低至402 μg/g.对W,Ni,C的去除效率高,Al和Mo的去除效果不明显.夹杂物尺寸减小,沿熔化区域方向富集.
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