钛铁矿中钛和铁的联合测定

Combined determination of titanium and iron in ilmenite

基于用碱熔法分解试样,试样溶液经酸化后无需分离作为母液备用。一份在适当的硫酸和盐酸溶液中,隔绝空气条件下,用铝将四价钛还原后,直接用硫酸铁铵滴定钛;另一份在适当酸度溶液中,用氯化亚锡将大量铁还原,再加三氯化钛将剩余少量铁还原后,用重铬酸钾标液滴定铁。本方法实现了钛铁矿中钛和铁的快速联测,简化了重复熔样,缩短了分析时间,测定全铁的相对标准偏差(n=6)小于0.30%,TiO2相对标准偏差(n=6)小于0.90%;测定标准样品,结果与认定值相符合,满足了生产分析要求。

The samples were decomposed by alkali fusion method. The sample solution could be used after acidification without separation. The titanium（Ⅳ）in one sample solution was reduced by aluminum in proper H2SO4-HCl medium in the absence of air, and then it was directly titrated with ferric ammonium sulfate solution. The large quantity of iron in another solution was reduced by stannous chloride in proper acid solution, and the residual little iron was reduced by adding titanium trichloride, and then it was titrated with potassium dichromate standard solution. This method realized a rapid combined determination of titanium and iron in ilmenite ore, which simplified the repeated sample fusion and shortened the analytical time. The relative standard deviations （RSD, n= 6） of total iron and TiO2 were less than 0.30 % and 0.90%, respectively. This method was applied to the determination of standard sample, and the results were consistent with the certified values, which could meet the requirements of analysis.