与大多数杂质的气化温度比较,钽和铌的熔点很高,因此,提取的金属可在高温下进行再提纯。但是在提纯时必须注意的是,钽和铌与除惰性气体以外的所有气体均具有很大的亲和力。因此,一切高温处理须在真空或纯惰性气体下进行。对高温下不能或很难去除的杂质,例如钨、钼、锆和铪以及铌中的钽和钽中的铌必须在加工钽、铌化合物时,即还原前就 Tantalum and niobium have a high melting point compared to the vaporization temperatures of most impurities, so that the extracted metals can be refined at elevated temperatures. However, it must be noted during purification that tantalum and niobium have a great affinity for all gases except inert gases. Therefore, all high-temperature treatment must be carried out under vacuum or pure inert gas. Impurities that can not be removed or are difficult to remove at high temperatures, such as tungsten, molybdenum, zirconium and hafnium, and niobium in niobium and niobium in tantalum must be processed before tantalum and niobium compounds, ie,