Determination of phosphorus pentoxide in rare earth ore by X-ray fluorescence spectrometry coupled with standard-less quantitative analysis
1.Guangdong Institute of Resources Comprehensive Utilization,Guangzhou 510650,China; 2.State Key Laboratory for Separation and Comprehensive Utilization of Rare Metals,Guangzhou 510650,China
Abstract：The sample was prepared by pressed powder pellet method. The tag was established by adding the standard sample with similar components into Omnian standard-less quantitative analysis software. Thus, the errors caused by possible mineral effect, particle effect and sample preparation could be corrected for powdered samples. The accurate determination of P2O5 content in rare earth ores by X-ray fluorescence spectrometry (XRF) was achieved. The optimal sample preparation conditions were obtained by experiments: the particle size was less than 0.074 mm; the pressing pressure was 40 t; the sample mass was 6.00 g and the holding time was 30 s. The accuracy test was investigated using rare earth ore containing different content gradients of P2O5. It was found that the direct determination results of P2O5 by Omnian software without addition of tag showed large errors. After adding tag, the analytical results by Omnian were basically consistent with those obtained by national standard method. The precision test indicated that the relative standard deviation (RSD, n=8) of determination results for P2O5 was less than 3%. The proposed method could meet the accurate analysis requirements of P2O5 in rare earth ores without the establishment of standard curve using large amounts of standard samples.
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