Determination of fourteen components in iron ore by X-ray fluorescence spectrometry with theoretical α coefficient and empirical coefficient method correction
LV Shan-sheng,XU Jin-long, QU Qiang
Zhanjiang Enter-Exit Inspection and Quarantine Bureau, Zhanjiang 524022,China
Abstract：The determination method of 14 components (including TFe,CaO,SiO2,MgO,Al2O3,MnO,TiO2,K2O,Na2O,Ni,Cu,Co,P and S) in iron ore by X-ray fluorescence spectrometry (XRF) with fusion sample preparation was established. The optimal flux for the decomposition of iron ore was mixed flux [m(Li2B4O7)∶m(LiBO2)=67∶33] with dilution ratio of 1∶20. The sample was pre-oxidized at 700 ℃ for 10 min. The problem of measurement strength decrease of low content elements and light elements caused by flux could be well solved. The matrix effect and spectral overlapping interference could be effectively eliminated after the use of theoretical α coefficient method and empirical coefficient method correction. The root mean square (RMS) of calibration curve after correction was small. The detection limits of testing components were between 0.61 μg/g and 335.09 μg/g. The precision test of iron ore sample was also conducted. The relative standard deviations (RSD) were between 0 and 8.7%. The certified reference material of iron ore was analyzed according to the experimental method, and the found results of each component were consistent with the certified values. Compared to other XRF methods for the analysis of iron ore, the proposed method was applicable for the determination of Co, Ni and Cu, and also Na and S which were difficult to be accurately determined. Moreover, it could meet the requirements of inspection efficiency and accuracy for import and export commodities.
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