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Purification of rare earth metals by electrolytic refining
Refining molten salt electrolysis method is a method for purifying metal of the metal to remove impurities in the purified metal certain molten salt electrolytically. The electrolytic refining method has a short cycle of purifying rare earth metals and has a significant effect on removing certain impurities.
In the electrolytic refining process, the rare earth metal with higher impurity is used as the anode. The most thorough research is the metal Gd [16] , which initially contains 810 μg/g O and 920 μg/g Ta. Entering LiF-GdF 3 electrolyzer and protecting with He gas, the content of H, O, N and Al, Fe, Ta and other metal impurities decreased significantly after electrolytic refining, but the C content remained unchanged, F content increased slightly, and electrons were passed. The bundle is smelted and removed. Electrolytic refining is especially suitable for Ta. Figure 1 is a schematic view of an apparatus for electrolytically refining metal ruthenium . A crude metal crucible is used as an anode, and a nickel liner or tungsten crucible is used as an electrolytic cell. The electrolyte composition is cm 2 and the cell pressure is 0.4-0.6V. After electrolysis, a needle-like or sheet-like metal crucible is deposited on the cathode, and then the metal is vacuum distilled at 880 ° C to remove the salt attached to the metal and then cast. Ingots.
Figure 1 Electrolytic purification equipment
References
16, Jones DW, et al. The rare earth in modern science and technology, Vol 1,309~314