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测定铁矿石中的氧化亚铁一般采用盐酸—氟化钠法。此法误差来源较多,如氟化钠用量,溶样温度以及溶解时间等均影响测定结果,而且保护装置也不够方便。为了解决这些问题,本实验采用盐酸—氢氟酸—硫酸在聚乙烯锥形瓶中于90℃(±5℃)的水浴上溶样,在硼酸和磷酸的稀释液介质中用重铬酸钾滴定。此法溶样效果好,溶样的温度时间又能很好的控制,特别是Fe(Ⅱ)在硫酸酸化的介质中比较稳定。本法不需要特殊的保护措施,就能比较好的控制Fe(Ⅱ)
Determination of iron ore in the general use of ferrous chloride - sodium fluoride method. This method more sources of error, such as the amount of sodium fluoride, sample temperature and dissolution time affect the determination results, and protection devices are not convenient enough. In order to solve these problems, this experiment using hydrochloric acid - hydrofluoric acid - sulfuric acid in polyethylene conical flask in 90 ℃ (± 5 ℃) in a water bath in the dilute solution of boric acid and phosphoric acid with potassium dichromate Titration. The method has the advantages of good solution quality, good solution time and good control of Fe (II), in particular, in the acidification of sulfuric acid. This law does not require special protection measures, we can better control Fe (Ⅱ)