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硫酸镁作为离子吸附型稀土矿的浸取剂,具有价格便宜、对环境影响小等优点,有望消除硫酸铵浸取过程中的氨氮污染,实现离子吸附型稀土矿的生态友好浸取。离子吸附型稀土矿浸出过程耗时长,过程中稀土浸出液所需取样数量多,而且稀土浸出液具有需要测试元素多,样品中元素含量差异大,样品之间同一元素含量差异大等特点。通过分析谱线选择、基体影响分析、谱峰漂移校正,分段计算等手段,建立了电感耦合等离子体原子发射光谱法(ICP-AES)测定镁盐体系稀土浸出液中稀土与非稀土杂质的方法。通过精密度实验、加标回收实验、空白实验及方法对比实验来验证方法的可靠性。研究表明:所建方法的方法检出限小于0.03 mg·L~(-1),被测元素的测试误差以及相对标准偏差都能控制在5%以内,可以实现对镁盐体系稀土浸出液中稀土、铝、镁、钙等元素的准确测试,获得较真实的稀土浸出率等过程参数,为硫酸镁浸取离子吸附型稀土矿这一新技术提供了分析测试保障。
Magnesium sulfate, as a leaching agent for ion-adsorbed rare earth mine, has the advantages of low price and little environmental impact, and is expected to eliminate ammonia nitrogen pollution in the process of ammonium sulfate leaching and achieve ecological friendly leaching of ion-adsorbed rare earth ore. The leaching process of ion-adsorbing rare earth minerals takes a long time, and the quantity of rare earth leachate required for sampling in the process is large. Moreover, the rare earth leaching solution has the characteristics of requiring more test elements, large differences in the content of the elements in the samples and large differences in the same elements among the samples. The method of inductively coupled plasma atomic emission spectrometry (ICP-AES) was established for the determination of rare earth and non-rare earth impurities in the rare earth leachate of magnesium salt system through the methods of spectrum selection, matrix influence analysis, peak drift correction and piecewise calculation. . Through the precision experiment, spike recovery experiment, blank experiment and method comparison experiment to verify the reliability of the method. The results show that the detection limit of the proposed method is less than 0.03 mg · L -1, the test error and the relative standard deviation of the tested elements can be controlled within 5% , Aluminum, magnesium, calcium and other elements of the accurate test to obtain a more realistic rare earth leaching rate and other process parameters for magnesium sulfate leaching ion-adsorbed rare earth mine this new technology provides analysis and testing protection.