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钒钛磁铁矿冶炼实验中要测定总铁、金属铁、氧化亚铁和三氧化二铁。金属铁的测定方法有多种,对同一个试样用不同的方法测定,得到的结果往往不同。二氯化汞法容易偏低,且汞盐剧毒。硫酸铜法的结果偏高,因为在弱酸性溶液中活性氧化亚铁大量溶解。冰乙酸-亚硫酸钠法的结果也偏高。三氯化铁-溴甲醇法操作复杂,手续长.三氯化铁溶液也溶解试样中的活性氧化亚铁,但可用一个公式进行修正,使金属铁的结果不再偏高,同时又能得到活性氧化亚铁的含量. 一金属铁的测定称取试样0.2000克,于250毫升三角瓶中,加10%三氯化铁溶液40毫升,放入铁心玻璃棒,塞上橡皮塞,在磁力搅拌器上搅拌30分钟,用酸冼石棉抽滤,用水冲洗三角瓶4～5次,石棉层5～6次,向滤
Determination of total iron, metal iron, ferrous oxide and ferric oxide in vanadium-titanium magnetite smelting experiments. Metal iron determination of a variety of methods, the same sample measured by different methods, the results obtained are often different. Mercury dichloride easily low, and mercury salt highly toxic. The result of the copper sulfate method is high because the active ferrous oxide dissolves largely in the weak acid solution. Glacial acetic acid - sodium sulfite results are high. Ferric chloride - bromine methanol complex operation, long procedures. Ferric chloride solution also dissolves the sample of active ferrous oxide, but can be a formula to be amended so that the metal is no longer the high iron results, but also can Get the content of active ferrous oxide .A metal iron determination weighed sample 0.2000 grams, in 250 ml Erlenmeyer flask, add 10% ferric chloride solution 40 ml, into the core glass rod, plug the rubber plug, in Stir for 30 minutes on a magnetic stirrer, aspirate with aspartame, rinse the flask 4 to 5 times, asbestos 5 to 6 times,