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硅铁在硝酸存在下,用氢氟酸处理,硅生成四氟化硅逸出。铁氧化灼烧成三氧化二铁。换算求得硅含量。准确称取0.2000克试样,放在恒重的刚玉坩埚中,加入浓硝酸5毫升,滴加40%氢氟酸至试样完全溶解,加热蒸干,在茂福炉中900℃加热30分钟,取
Ferrosilicon in the presence of nitric acid, hydrofluoric acid treatment, silicon generated silicon tetrafluoride escape. Iron oxide burning into ferric oxide. Converted to obtain the silicon content. Accurately weighed 0.2000 grams of sample, placed in constant weight corundum crucible, add concentrated nitric acid 5 ml, 40% hydrofluoric acid was added dropwise until the sample was completely dissolved, heated to dry, heated in a Maofu furnace at 900 ℃ for 30 minutes, take