在測定硅鉄中硅的各种方法中,以重量法的准确度最高,但是所需要的时间很长,所消耗的劳动力又多,因此不能滿足工业分析的需要。用准确度很高的方法来测定(?)铁中的硅,除了分析标准试样之外,一般是不需要的。硅铁中一般含硅30—80％,在日常分析工作中,能把误差保持在±1％之内,已经完全能够滿足炼鋼方面的要求。为了快速测定硅铁中硅,常用的快速法有比重法、比色法和氢氟酸重量法。其中比重法最快,但是准确度最差,又需要大量试样。比色法和氫氟酸重量法虽然比重量法快得多,但是也需要1/2—1小时才能完成。硅铁中除了硅和铁之外还有一些錳,其他金属和非金属一般只有微量。下面所提出的测定硅铁中硅的 Among the various methods for determining silicon in silicon 鉄, the gravimetric method has the highest accuracy, but takes a long time and consumes a lot of labor, and thus can not meet the needs of industrial analysis. Determination of (?) Silicon in iron by a highly accurate method is generally not required except for the analysis of standard samples. Ferrosilicon in the general silicon 30-80%, in routine analysis, can keep the error within ± 1%, has been fully able to meet the requirements of steelmaking. In order to quickly determine the silicon in ferrosilicon, the commonly used fast method has the proportion method, colorimetry and hydrofluoric acid gravimetric method. The proportion of the fastest method, but the worst accuracy, but also requires a large number of samples. Colorimetric and hydrofluoric acid gravimetric methods, although much faster than the gravimetric method, but also need 1 / 2-1 hours to complete. Ferrosilicon in addition to silicon and iron in addition to some manganese, other metals and non-metallic generally only trace. The determination of silicon in ferrosilicon is given below