Vacuum furnace for preparing high-purity metal ytterbium and method for preparing high-purity metal ytterbium through vacuum furnace

The invention discloses a vacuum furnace for preparing high-purity metal ytterbium and a method for preparing the high-purity metal ytterbium through the vacuum furnace, and belongs to the technical field of rare earth pyrometallurgy. The vacuum furnace for preparing the high-purity metal ytterbium comprises a condensation crucible (1), a crucible (5) and a separator (6). The condensation crucible(1), the crucible (5) and the separator (6) are sequentially located in the vacuum furnace from top to bottom. The separator (6) is arranged in the middle of the crucible (5) or on the upper portionof the crucible (5). According to the vacuum furnace, through the characteristic that the vapor pressure of the metal ytterbium is higher than that of metal lanthanum and other impurities, through phase change heat of rare earth metal vapor, the metal ytterbium is evaporated and condensed many times in the separator to separate low-vapor-pressure impurities, and the high-purity metal ytterbium isprepared at a time. The vac