采用真空电弧重熔技术对工业纯金属镧进行了提纯。在一定真空度下，工业纯金属镧经４次（每次４ｍｉｎ）熔炼后，镧中的“间隙”杂质（Ｃ、Ｎ、Ｏ）明显减少，Ｃｌ基本被除去，一些熔点低、蒸气压高的金属杂质（Ｃａ、Ｚｎ、Ｍｇ等）也被明显的除去，对Ｆｅ、Ｓｉ等除去作用不大。对真空重熔提纯镧的除气过程、除夹杂物过程及镧的损失进行了讨论。 The industrial pure metal lanthanum was purified by vacuum arc remelting technology. Under a certain degree of vacuum, after 4 times of pure lanthanum (4min each time) smelting, the “interstitial” impurities (C, N, O) in lanthanum obviously decrease, Cl is basically removed, some have low melting point and high vapor pressure Of the metal impurities (Ca, Zn, Mg, etc.) are also significantly removed, Fe, Si and other removal is not effective. The degassing process of vacuum remelting of lanthanum was discussed in addition to the inclusion process and the loss of lanthanum.