该方法基于1）用过氧化钠烧结，用盐酸和高氯酸处理，用稀硝酸处理，或2）用盐酸、硝酸和高氯酸处理，蒸发，过滤含有任何残留物的二氧化硅，与碳酸钠熔融，溶解在盐酸和高氯酸中，在这两种情况下，溶液蒸发、沉淀二氧化硅过滤、点火和称重、用氢氟酸和硫酸处理点火残留物、点火和重新称重。适用于天然铁矿石、铁精矿和烧结矿（包括烧结矿产品）中1%至15%的硅含量。

The method is based on decomposition of the test portion by 1) sintering with sodium peroxide and treatment with hydrochloric and perchloric acids and treatment with dilute nitric acid, or 2) treatment with hydrochloric, nitric and perchloric acids, evaporation, filtration of silica with any residue, fusion with sodium carbonate and dissolution in hydrochloric and perchloric acids, in both cases evaporation of the solution, filtration of the precipitated silica, ignition, and weighing, treatment of the ignited residue with hydrofluoric and sulfuric acid, ignition, and reweighing. Applies to silicon contents between 1 % and 15 % in natural iron ores, iron ore concentrates and agglomerates, including sinter products.