Migration Laws of Impurities in Purification Process of Yttrium Metal by Plasma Zone Melting
Metal Y was purified by plasma zone melting,and the migration laws of Al,Si,Fe,Ni,Cu,and Mo impurities during the zone melting purification process were obtained.Calculation results show that the equilibrium distribution coefficients of the Al,Si,Fe,Ni,Cu,and Mo impurities in metal Y are 0.2173,0.2201,0.5065,0.1586,0.1742,and 0.8576,respectively.Because all equilibrium distribution coefficients are less than 1,the solubility of impurities in the liquid phase is greater than that in the solid phase.Therefore,theoretically,with the movement of molten zone,the Al,Si,Fe,Ni,Cu,and Mo impurities will be concentrated in the tail side of Y metal ingot,namely last-to-freeze zone.Experiment results demonstrate the correctness of the theoretical calculation.Besides,the internal relationship between the zone melting times and the impurity migration was investigated.Results show that with the increase in the zone melting time from 5 to 10,the concentration degree of impurities at the tail side of Y metal ingot is increased,i.e.,the removal ratio is increased.After 10 times of zone melting,the removal ratios of Al,Si,Fe,Ni,Cu,and Mo impurities are 45.71％,61.54％,33.98％,64.15％,52.14％,and 46.28％,respectively.Because the saturated vapor pressure of the abovementioned impurities is similar to that of metal Y,impurities are difficult to be removed by the common methods.The investigation of plasma zone melting proposes a new research direction for the preparation of high purity Y.
migration lawsplasma zone meltingdistribution coefficientyttriumremoval efficiency
徐明磊、卢文礼、张小伟、陈德宏、李金颖、余创、杨文晟、王志强
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有研稀土高技术有限公司,河北廊坊 065201
有研稀土新材料股份有限公司,北京 100088
稀土国家工程研究中心,北京 100088
北京科技大学冶金与生态工程学院,北京 100083
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迁移规律 等离子体区域熔炼 分配系数 钇 去除效率
National Key Research and Development Program of ChinaNational Science and Technology Major Project of China
NETL
NSTL
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