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由于铜盐置换反应过程中产生一种能诱导游离氧化亚铁、磁铁矿及赤铁矿等氧化铁矿物部分溶解的副反应,所以当测定铁矿石及人造富矿中的金属铁时,一般都不再引用硫酸铜方法。因此,我们曾对经典的三氯化铁方法进行过评价性的研究。已经证明,磁铁矿和赤铁矿不干扰三氯化铁法测定金属铁,而游离氧化亚铁(即富氏体)在三氯化铁溶液中的溶解度也比较小(相当于金属铁之量,一般均小于0.3%)。这对于常量分析,似无明显影响,但对于低含量金属铁(如≤2%Fe°)的测定,则不适用。
As a result of side reactions that lead to the partial dissolution of iron oxide minerals such as free ferric oxide, magnetite and hematite during the copper salt displacement reaction, when the determination of metallic iron in iron ore and man-made rich ore, Generally no longer refer to the copper sulfate method. Therefore, we have conducted an evaluative study of the classical ferric chloride method. It has been demonstrated that magnetite and hematite do not interfere with the determination of metallic iron by the ferric chloride process, whereas the solubility of the free ferrous oxide (ie, the bismuth-rich) in the ferric chloride solution is also relatively small (equivalent to metallic iron Volume, generally less than 0.3%). This does not seem to have a significant effect on constant analysis, but does not apply to the determination of low levels of metallic iron (eg, ≤2% Fe °).