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1954年J.Y.Elleaburg等首先应用三(艹卡)胺氯仿溶液萃取分离濃盐酸中的鈮和钽,鈮被萃取,而钽不被萃取,两者达到定量分离。后来H.Funk等用制备法研究了萃取物的组成,他們制得了二种晶体,相应的化学式为[(C_6H_5CH_2)_3NH]_2NbCl_7·1.5OHCl_3和[(C_6H_5CH_2)_3NH]_2NbOCl_5·2CHCl_3。鈮形成氯合阴离子的形式,事先已被J.H.Kanzel-meyer等所提出,在盐酸濃度高于10N时,鈮主要是以NbOCl_4~-或NbOCI_5~=型式存在。
In 1954, J.Y.Elleaburg et al. First applied three (艹 card) amine chloroform extraction of concentrated hydrochloric acid niobium and tantalum, niobium is extracted, and tantalum is not extracted, the two reached quantitative separation. Later, H.Funk et al. Studied the composition of the extracts by preparative method. They prepared two kinds of crystals, corresponding to the chemical formula [(C_6H_5CH_2) _3NH] _2NbCl_7 · 1.5OHCl_3 and [(C_6H_5CH_2) _3NH] _2NbOCl_5 · 2CHCl_3. The formation of niobium as a chloride anion has previously been proposed by J. H. Kanzel-Meyer et al. Niobium is mainly present in the form of NbOCl 4 ~ - or NbOCI 5 ~ = at hydrochloric acid concentrations above 10N.