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本发明用硫化法从含有价钨的水溶液中除掉钼。溶液的硫化程度应控制在能使钼全部转换成硫代钼酸盐。而钨则基本上很少转换成硫代钨酸盐。然后使形成的含硫代钼酸盐络合离子的溶液与适当数量的有机萃取剂接触一段时间使硫代钼酸盐络合离子进入有机萃取剂。所用有机萃取剂由芳香族有机溶剂和结构式为 R_3(CH_3)N~+A~-的委铵化合物组成 R_3(CH_3)N~+A~-中的 R 为含4～8个碳原子的烷基,A 是由矿物酸产生的阴离子.
In the present invention, sulfide is used to remove molybdenum from an aqueous tungsten-containing solution. The degree of cure of the solution should be controlled so that all molybdenum can be converted into thiomolybdate. Tungsten, on the other hand, is rarely converted to thio-tungstate. The formed solution of thiomolybdate complex ions is then contacted with an appropriate amount of organic extractant for a period of time to allow the thiomolybdate complex ions to enter the organic extractant. The organic extractant used is composed of an aromatic organic solvent and a quaternary ammonium compound of the structural formula R_3 (CH_3) N ~ + A ~ - wherein R in R_3 (CH_3) N ~ + A ~ is an alkane of 4 to 8 carbon atoms A, is the anion produced by the mineral acid.