摘要
现场X射线荧光光谱(XRF)测量因样品的不平度效应、不均匀效应和湿度效应等面临的技术难题,使得手持式XRF现场原位分析结果与实验室分析结果存在一定偏差。本文现场手持式X射线荧光光谱分析仪的测试时间、样品含量、测试距离、样品干湿度和样品粒度等测试条件对测试结果的影响进行了定量研究。结果表明:在最佳测试时间90s条件下,得到Cu、Mo、Pb、Zn元素测定限分别为57μg/g、14μg/g、24μg/g、38μg/g并给出测定限计算公式;现场分析测试距离应小于5 mm并保持样品表面干燥,块状样品测试方法最简单但测试结果变化最大,样品粉碎至粒径80目以上测试结果精准度最好,但制样过程较复杂,样品粉碎后的混合状态是现场测试的最佳策略。对西藏驱龙斑岩铜矿岩心扫描的实际应用表明,手持式XRF分析仪适合于现场原位分析,可满足野外斑岩铜矿圈定矿体等快速勘查评价要求,提高了工作效率并降低勘查成本。
BACKGROUND:There is a certain deviation between the on-site analysis results of hand-held XRF and the laboratory analysis results due to the unique technical difficulties in field X-ray fluorescence measurement such as roughness effect,uneven effect and humidity effect of samples.OBJECTIVES:To seek economic,rapid and practical test conditions of hand-held XRF for rapid exploration of porphyry copper ore in practical work.METHODS:Influence of test conditions,such as analytical time,sample content,test distance,sample dry humidity and sample particle size on the analytical results of Niton XL3t GOLDD+hand-held XRF was quantitatively studied.RESULTS:The results showed that,under the best test time of 90s,the determination limits of Cu,Mo,Pb,and Zn were 57μg/g,14μg/g,24μg/g,and 38μg/g,respectively,and the calculation formula for the determination limit was given.The field analysis test distance should be less than 5mm and the sample surface should be kept dry.The test method for bulk sample was the simplest but the test results varied the most.When sample was crushed to a particle size of 80 mesh or above,the stability and accuracy of the results were best.Considering that it took a long time to crush sample into 80 mesh,the mixed state of the sample after crushing was better strategy for field testing.CONCLUSIONS:The practical application of core scanning in Qulong porphyry copper deposit in Tibet shows that the handheld XRF analyzer is suitable for in-situ analysis and can meet the requirements of rapid exploration and evaluation such as delineation of copper ore bodies in field,which can greatly improve work efficiency and reduce exploration cost.
作者
孙伟涛
郑有业
牛学瑶
秦越强
王伟
乔衍溢
邸宝刚
侯红星
张蜀冀
丛鹏飞
SUN Wei-tao;ZHENG You-ye;NIU Xue-yao;QIN Yue-qiang;WANG Wei;QIAO Yan-yi;DI Bao-gang;HOU Hong-xing;ZHANG Shu-ji;CONG Peng-fei(No.2 Gold Geological General Party of Chinese Armed Police Force(Langfang Natural Resources Comprehensive Survey Center,China Geological Survey),Langfang 065000,China;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China)
出处
《岩矿测试》
CSCD
北大核心
2021年第2期206-216,共11页
Rock and Mineral Analysis
基金
国家重点研发计划项目“深地资源勘查开采——深部资源预测系统技术研究与示范”(2017YFC060150)
中国地质调查局地质调查项目“鄂尔多斯市煤炭矿集区生态修复支撑调查”(DD20208078)。
