手持式X射线荧光光谱分析仪在斑岩铜矿快速勘查中的应用

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...

Practicality of Hand-held XRF Analyzer in Rapid Exploration of Porphyry Copper Deposit

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.