Discussion on application of portable X-ray fluorescence spectrometer in determination of Bayan Obo ore
CHEN Biao, JIA Xiaoqi, LI Qiang, HOU Shaochun, LIU Yanjiang, ZHANG Lifeng
State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization, Baotou Research Institute of Rare Earth, Baotou 014030, China
Abstract：Portable X-ray fluorescence spectrometer (PXRF) has been widely used in the detection of the elemental content in geological samples.However, in practice,many factors such as the heterogeneity of mineralization of geological samples,sample humidity and test time will affect the precision of test results by PXRF.In experiments,the main elements (Ca,Ba,Fe,Mn,Sr) and rare earth elements in Bayan Obo ore were selected as the research object.The influence of these factors on the testing result were quantitatively investigated by varying the sample size (block-broken porphyritic-powder),the surface dry humidity and the test time of instrument (60,90,120,150,180 s).The results showed that the moisture of the sample would lead to lower test results,while the detection time had little influence on the test results of elemental content.The test method of block sample was simple but the precision was low.When the sample was crushed to higher than 120 mesh (125 μm),the precision of test results was best.Under the optimized experimental conditions,the Bayan Obo ore was analyzed by PXRF.The relative standard deviations (RSD, n=6) of determination results were between 0.70% and 5.5%.The found results were consistent with those obtained by wet chemical method.
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