Abstract：Ytterbium metal scrap from high purity ytterbium target was purified by vacuum distillation, and the effects of temperature and time on the yield and surface quality of Ytterbium metal were studied. The results show that 20.52 kg of high purity Ytterbium target scrap can be separated from titanium scrap by distillation at 830℃ for 3 hours under the condition of vacuum less than 1 Pa, and the evaporation rate of Ytterbium metal can reach 95.1%. There are many inclusions in ytterbium metal, so it is not suitable to continue to be used as target material. By secondary distillation and purification of 19.5 kg of ytterbium metal obtained from the first separation, the separation of ytterbium metal from entrained impurities can be realized under the conditions of vacuum less than 1 Pa and distillation time of 7 hours at 650℃. The purity of ytterbium metal (Yb/tre) is 99.99%, and the evaporation rate of ytterbium metal is 98.35%. The secondary residual powder in crucible bottom was analyzed by scanning electron microscope. Impurities are mainly Yb and oxides of Al and Fe.
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2021, Vol. 28 