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硅钙中硅的分析一般使用差减法,但该法测定的硅值往往比实际值高出2—4%。为了保证出厂结果真实,用差示光度法分析硅时,遇到一个很大的困难,即在常温条件下用硝氟酸溶解硅钙比硅铁和硅铬还困难。因此采取了两条措施:(1)制样的粒度必须在160目以上;(2)必须用相同粒度的硅钙标
Calcium silicon in the analysis of silicon generally use the subtraction method, but the method of determination of the silicon value is often higher than the actual value of 2-4%. In order to ensure the true factory results, the differential spectrophotometric analysis of silicon, we encountered a great difficulty, that is, under normal temperature conditions with hydrofluoric acid dissolved calcium silicate than ferrosilicon and silicon-chromium is also difficult. Therefore, two measures have been taken: (1) the particle size of the sample preparation must be above 160 mesh; (2) the same size of silicon calcium standard