Abstract：A method was developed for determination of silica, aluminum oxide, ferric oxide, calcium oxide, magnesium oxide, phosphorus pentoxide, sodium oxide, potassium oxide, strontium oxide, titanium oxide, fluoride in phosphate ores by X-ray fluorescence spectrometry. Fusion method was selected for sample pretreatment, while the experimental parameters were optimized by comparing the response value of phosphorus and calcium and observing experimental phenomena. The final experimental conditions were as follows: sampling amount of 0.700 0 g, dilution ratio of 8∶1, pre-oxidization time of 4 min, sample melting temperature of 1 050 ℃ and sample oscillation time of 5 min. The calibration sample series with concentration gradient, which were prepared by mixing phosphate ore reference materials, were treated by fusion preparation. The working range of calibration curve could cover the content distribution of components in phosphate concentrate, middlings and tailings. The ignition loss of sample was measured and then manually input for normalization compensation. The detection limit of method was as follows: 63 (SiO2), 141 (Al2O3), 35 (Fe2O3), 198 (CaO), 67 (MgO), 275 (P2O5), 39 (Na2O), 46 (K2O), 2(SrO2), 42 (TiO2) and 102 (F) μg/g. The proposed method was applied to the determination of three mixed reference samples. The results were consistent with the theoretical values, and the relative standard deviation (RSD, n=10) was between 0.066% and 5.3%.
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