1.Shandong Institute of Geological Sciences, Jinan 250013,China; 2.Key Laboratory of Geological Processes for Mineralization of Metal Minerals and Resource Utilization in Shandong Province, Jinan 250013,China
Abstract：After the magnesite sample was prepared with fusion method, the content of MgO, Al2O3, SiO2, P2O5, CaO, TiO2, MnO and Fe2O3 in magnesite was determined by X-ray fluorescence spectrometry(XRF), realizing the simultaneous determination of major and minor components. The calibration curve was plotted with the national certified reference materials of dolomite, brucite and limestone and artificially synthetic calibration sample, solving the determination problems of high content MgO and low content CaO. The loss on ignition of sample was firstly measured. Then, the burned sample was prepared for fuse pieces. The calibration curve was established by the content after correction of loss on ignition and the corresponding X-ray fluorescence intensity, and the matrix correction was also conducted. Finally, the content in burned sample was determined to calculate the content in actual sample. The dilution ratio between the burned sample and flux (Li2B4O7) was 1∶10. One drop of LiBr solution (1.0 g/mL) was added and used as releasing agent. The fuse piece was prepared at 1 050 ℃ for 9 min. The correlation coefficients of calibration curves of components were between 0.997 6 and 0.999 9. The detection limit of method was 10-320 μg/g. One actual magnesite sample was used for precision test. The relative standard deviation(RSD, n=12) of components were between 0.25% and 3.6%. The proposed method was applied to the determination of certified reference material and actual samples of magnesite, and the results were basically consistent with the certified values and those obtained by wet method.
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