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氢氟酸—硫酸分解样品是测定铝土矿中钾钠采用普通分解方法,但是,样品分解的时间很长,挥发的气体污染环境,且氟离子不易驱赶完全,导致高含量钾的测定结果偏低,如氧化铁含量高,对钠的测定产生正干扰。本文应用硫酸增压封闭浸出铝土矿中钾和钠,采用正交试验设计法,对影响增压封闭浸出的条件和干扰离子的消除进行了试验,制定了火焰光度法测定铝土矿中钾钠的方法,它较之氢氟酸—硫酸溶样,缩短了分析时间(测定一个样品只需2.5小时),避免了样品分解过程中的污染和损失,方法的准确度和精密度均达到铝土矿化学分析国家标准的要求。本法的测定下限:氧化钾0.1％氧化钠0.01％。
Hydrofluoric acid - sulfuric acid decomposition of the sample is determined by ordinary decomposition of potassium and sodium in bauxite, but the sample decomposition time is very long, volatile gases pollute the environment, and fluoride ions are not easy to drive completely, resulting in high potassium content of the measurement results partial Low, such as high iron oxide content, has a positive interference with the determination of sodium. In this paper, potassium and sodium in leaching bauxite were closed by supercharging of sulfuric acid. The orthogonal test design method was used to test the conditions influencing closed pressure leaching and the elimination of interfering ions. A flame photometric method was developed for the determination of potassium Sodium method, compared to hydrofluoric acid - sulfuric acid sample, shorten the analysis time (a sample measured only 2.5 hours), to avoid the decomposition of the sample during the pollution and loss, the accuracy of the method and the precision reached aluminum Soil chemical analysis of national standards. The lower limit of determination of this Law: 0.1% sodium oxide 0.01% potassium oxide.