能量色散X荧光光谱法测定红土镍矿中镍等化学成分

Investigation of Energy-Dispersive X-ray Fluorescence Spectrometry for Determination of Chemical Composition of Lateritic Nickel Ores

基于能量色散X荧光(EDXRF)分析技术,建立了测定红土镍矿中铝、铬、铁、镁、锰、镍和硅含量的新方法。以锥形铝杯为试料支撑,为X荧光分析提供了适当的压片试样。收集了不同成分的红土镍矿样品,通过化学法和仪器法分析定值,作为标准物使用。用不同数学模型对元素间的相互干扰及吸收增强效应进行校正建立校准曲线。研究表明,采用锥形铝杯-粉末压片法制备红土镍矿分析试样,用EDXRF光谱仪进行测定,铝、铬、铁、镁、锰、镍和硅的检出限分别为0.0140%、0.0008%、0.0040%、0.0010%、0.0004%、0.0002%和0.0060%,相对标准偏差(RSD)分别为0.56%、0.90%、0.21%、2.70%、1.41%、0.98%和1.65%,方法具有良好的准确度和精密度。

In this paper,a method for the determination of A1, Cr, Fe, Mg, Ni and Si contents in lateritic nickel ore was established by energy-dispersive X-ray fluorescence（EDXRF） spectrometry. Appropriate analytical specimens were prepared by a self-made tapered aluminum specimen cup, avoiding the specimen broken off and damage of instrument. Due to the lack of standard materials,the lateritic nickel ore sample with different compositian contents were collected,and used as standard materials. The X-ray fluorescence analytical calibration curves of lateritic nickel ore were established, and the mutual interference and the absorption enhance effect between elements were corrected with different mathematical treatment model. Also, the results showed that the detection limits for A1, Cr, Fe, Mg, Mn, Ni and Si were 0. 0140% ,0. 0008% ,0. 0040% ,0. 0010% ,0. 0004% ,0. 0002% and 0. 0060% ,respectively. RSD were 0.56%, 0. 90%, 0.21%, 2.70%, 1.41%, 0.98% and 1.65%, respectively. In conclusion, this new method is not only an efficient and simple way to determine the component contents in lateritic nickel ore,but also can be used in a wide range of chemical composition with precision and accuracy.