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1 概述钛铁矿是难熔矿物,二氧化钛含量在1%以上时,一般采用“硫酸铁铵容量法”进行测定。即样品经碱熔后,在酸性溶液中用铝片将Ti~(4+)还原为Ti~(+)以流氰化钾为指示剂,用硫酸铁铵标准溶液滴定,计算二氧化钛含量一般钛铁矿中铁的含量比较高,在用铁坩埚熔祥时,由于使用的过氧化钠是一种强烈的氧化性熔剂,对坩埚的侵蚀严重,大量的铁被熔融下来,在用铝片还原时,就要消耗很多铝片。另外考虑铁坩埚没有高铝坩埚耐用,而且空白值比较高,因此改用高铝坩埚
1 Overview ilmenite is a refractory mineral, titanium dioxide content of 1% or more, the general use of “ammonium ferric sulfate capacity method ” for determination. That is to say, after the sample is melted by alkali, Ti ~ (4 +) is reduced to Ti ~ (+) with aluminum flakes in acidic solution, potassium cyanide is used as an indicator and titrated with ammonium ferric sulfate standard solution to calculate the content of titanium dioxide Iron ore in the iron content is relatively high, when using the iron crucible Fusiang, due to the use of sodium peroxide is a strong oxidizing flux, crucible erosion serious, a lot of iron is melted down in the reduction with aluminum , It is necessary to consume a lot of aluminum. Also consider the iron crucible is not durable aluminum crucible, and the blank value is relatively high, so switch to high-alumina crucible