便携式X射线荧光光谱仪测定白云鄂博矿石的应用探讨  

Discussion on application of portable X-ray fluorescence spectrometer in determination of Bayan Obo ore

作　　者：陈彪 贾晓琪 李强[1] 候少春 刘雁江 张立锋[1] 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)

机构地区：[1]包头稀土研究院,白云鄂博稀土资源研究与综合利用国家重点实验室,内蒙古包头014030

出　　处：《冶金分析》2022年第11期44-49,共6页Metallurgical Analysis

基　　金：国家重点研发计划“战略性矿产资源开发利用”重点专项项目(2021YFC2901704);内蒙古自治区自然科学基金面上项目(2021MS04004);白云鄂博稀土资源研究与综合利用国家重点实验室项目(2022Z2406,2021Z2271)。

摘　　要：便携式X射线荧光光谱仪(PXRF)已广泛应用于地质样品的元素含量检测工作,但在实际应用中,地质样品矿化的不均一性、样品湿度、测试时间等因素都会对便携式X射线荧光光谱仪(PXRF)测试结果精密度造成影响。实验以白云鄂博矿石主量元素(Ca、Ba、Fe、Mn、Sr)和稀土元素为研究对象,通过改变样品粒度(块状-碎斑状-粉末状)、样品表面干湿度和仪器的测试时间(60、90、120、150、180 s)等因素来定量探讨其对测试结果的影响。结果表明:样品湿润会导致测试结果偏低,检测时间对元素含量测试结果影响不大。块状样品测试方法简单但测试结果分散,精密度低,样品粉碎至120目(125μm)以上测试结果精密度最好。在优化的实验条件下采用PXRF对白云鄂博矿石进行分析,各组分测定结果的相对标准偏差(RSD,n=6)为0.70%~5.5%;与化学湿法值的一致性较好。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(125μm),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.

关 键 词：便携式X射线荧光光谱仪(PXRF) 白云鄂博矿石 地质样品 样品粒度 测定时间 干湿度 

分 类 号：O657.34[理学—分析化学] TF031[理学—化学] TF041[冶金工程—冶金物理化学]