Determination of ten components in magnesia refractory material by X-ray fluorescence spectrometry with empirical coefficient method
SUN Xiao-fei1,YANG Dan-dan2,WEN Meng-xi1,JIA Yun-hai*1
1.Central Iron & Steel Research Institute,Beijing 100081,China; 2.Beijing Research Institute of Chemical Engineering and Metallurgy,Beijing 101149,China
Abstract：In order to meet the testing requirements of various magnesia refractory materials, a fusion sample preparation technique was developed with mixed flux (Li2B4O7-LiBO2-LiBr) under the following conditions: dilution ratio of 1∶10, temperature of 1 050 ℃ and fusion time of 20 min. The contents of ten components in magnesia refractory materials (including MgO, CaO, SiO2, Al2O3, Fe2O3, MnO, P2O5, TiO2, Cr2O3 and K2O) were determined by X-ray fluorescence spectrometry (XRF). The calibration curves were prepared using spectral pure reagents, certified reference materials, synthetic samples by pure reagents and standard solution, and chemically certified materials. The correction was selected to correct the inter-element effects according to the comparison of value of the criteria of empirical calibration method. The calibration curves of each component were fitted well, and the matrix effect in magnesia refractory materials was effectively corrected. The precision tests were performed with magnesia refractory materials. The relative standard deviations (RSD, n=7) were between 0.053% and 3.1%. The accuracy tests were also conducted with standard and unknown samples. The found results were consistent with the certified values and those obtained by wet method.
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