Determination of nineteen components in iron ore by X-ray fluorescence spectrometry
ZHANG Li-xin1,YANG Dan-dan2, SUN Xiao-fei1, WEN Meng-xi1
1.Central Iron and Steel Research Institute, Beijing 100081, China; 2.Beijing Research Institute of Chemical Engineering and Metallurgy, Beijing 101149, China
Abstract：The iron ore sample is prepared by fusion method under the following conditions: the mixed flux (lithium tetraborate-lithium metaborate-lithium bromide), the dilution ratio of 1∶12, and fusion at 1 000 ℃ for 25 min. The content of 19 components in iron ore were determined by X-ray fluorescence spectrometry (XRF), including total iron, silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide, manganese oxide, titanium dioxide, phosphorus, sulfur, potassium oxide, sodium oxide, vanadium pentoxide, chromium, nickel, copper, zinc, arsenic, lead and barium oxide. The calibration curves were prepared and piecewise regressed using the certified reference materials, spectral purity materials, artificially synthesized samples and samples which were certified by chemical method. The cobalt oxide was added as the internal standard to correct the determination of total iron. The elements of copper, zinc, arsenic and lead were corrected by the Compton scattering line. Other 14 components were corrected by the empirical coefficient method. The matrix effect could be effectively eliminated. The precision test of iron ore sample was conducted. The relative standard deviations (RSD, n=11) were between 0.13% and 7.7%. The accuracy tests of standard sample and unknown sample were also conducted. The found results were consistent with the certified values or those obtained by the wet method.
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