Abstract：The pressed powder pellet method was an ideal, green and environment friendly sample preparation method. It was simple and rapid. However, the determination results were greatly affected by the granularity effect, limiting the application of this method in many fields. In order to solving the influence of granularity effect on direct tabletting of sample powder, the certified reference material of phosphate ore was grinded to micron size using the ultra-high-speed planetary superfine crusher. The sample was directly prepared with the powder. Then, the content of 12 components (fluorine, phosphorus pentoxide, silicon dioxide, aluminum oxide, total ferric oxide, manganese oxide, titanium dioxide, strontium oxide, calcium oxide, manganese oxide, potassium oxide and sodium oxide) in phosphate ore was determined by the wavelength dispersive X-ray fluorescence spectrometry. The results indicated that the crushing of sample into micron size could effectively overcome the granularity effect. The found results were satisfactory. Particularly, the determination range of fluorine was improved to 10.68%. The determination results of light components such as potassium oxide and sodium oxide were also good. The calibration curve was drawn by the certified reference material of phosphate ores and the artificially prepared standard materials. The root mean square (RMS) of components were between 0.001 1 and 0.53. The absorption-enhancing effect among components was corrected by the empirical coefficient and Compton scattering internal standard method. The detection limits of method were between 3 μg/g and 282 μg/g. The precision test was conducted using two national standard samples of phosphate ore. The relative standard deviations (RSD, n=10) were between 0.17% and 5.2%. The accuracy test was conducted by the mixed standard samples prepared using the certified reference materials. The found results were consistent with the reference values.
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