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我们对钨精矿中钨的络合滴定进行了探讨,采用盐酸—硝酸分解矿样,加动物胶作凝聚剂,使钨酸沉淀析出。用氢氧化钠溶解后,加过量的硝酸铅标准溶液沉淀钨酸铅,再用EDTA标准溶液滴定过量的铅间接测定三氧化钨。试验结果说明:沉淀钨酸铅的适当酸度为pH6.8—7.2,对60毫克三氧化钨,0.02M硝酸铅用量为25毫升,乙酸铵用量为1.5—2克。取60毫克纯三氧化钨分别加入0.15毫克铁、0.1毫克铜、0.2毫克锡、0.1毫克氧化钙、0.2毫克镁、
We discussed the complexation titration of tungsten in tungsten concentrates, using hydrochloric acid - nitric acid to decompose ore samples and adding animal glue as coagulant to precipitate tungstic acid. After dissolving with sodium hydroxide, add excessive lead nitrate standard solution to precipitate lead tungstate, and then titrate excess lead by EDTA standard solution to indirectly measure tungsten trioxide. The test results show that the proper acidity of precipitated lead tungstate is pH6.8-7.2, for 60 mg tungsten trioxide, 0.02 ml lead nitrate is 25 ml and ammonium acetate is 1.5-2 g. Take 60 mg of pure tungsten oxide were added 0.15 mg of iron, 0.1 mg of copper, 0.2 mg of tin, 0.1 mg of calcium oxide, 0.2 mg of magnesium,