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目前钢中微罱硅的分析基本上都是用不分离铁的比色法,这对测定纯铁中十万分之几的硅来说,显然是不能适应的。我们曾经把纯镍中低硅分析方法直接引用到钢中低硅的测定(0.01～0.10%Si),但用于纯铁时遭到了失败。试验表明,随着硅测定量的降低,铁基量相应增加,大量铁离子和钼酸根的络合,使硅和钼的络合反应受到影响,因此必须将大量铁分离,并用有机溶剂将生成的硅钼黄萃取富集,以提高显色灵敏度。本试验就是在此基础上进行的。
At present, the analysis of micro-silicon in steel is basically the colorimetric method that does not separate iron, which obviously can not be adapted to the determination of silicon in a few hundredths of pure iron. We used to quote pure low-middle-silica analysis of pure nickel directly to low-silicon steels (0.01-0.10% Si) but failed when used with pure iron. The experimental results show that as the amount of silicon decreases, the amount of Fe-base increases correspondingly, and the complexation of a large amount of iron ions with molybdate affects the complexation reaction between silicon and molybdenum. Therefore, a large amount of iron must be separated and generated with organic solvents Of the silicon molybdenum yellow extraction enrichment to improve color sensitivity. This test is based on this.