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含钨材料的回收方法为:(1)用钠的硝酸盐或氮化物或它们的混合物熔体分解含钨材料,以制得Na_2WO_4;(2)用CaCl_2溶液从Na_2WO_4溶液中沉淀CaWO_4;(3)用HCl溶液将CaWO_4转成H_2WO_4;(4)将H_2WO_24煅烧成氧化钨,并还原成金属钨。 分解含钨材料是用按钨含量化学计算的钠的硝
The tungsten-containing material is recovered by (1) melt-decomposing the tungsten-containing material with sodium nitrates or nitrides or mixtures thereof to produce Na_2WO_4; (2) precipitating CaWO_4 from the Na_2WO_4 solution using a CaCl_2 solution; (3) ) With HCl solution CaWO_4 into H_2WO_4; (4) H_2WO_24 calcined tungsten oxide, and reduced to tungsten metal. Decomposition of tungsten-containing materials is based on the tungsten content of stoichiometric sodium nitrate