| Energy dispersive X-ray fluorescence analysis is a modern instrument analysis method.Compared with other analytical methods from the analysis of the scope, accuracy, detection limit, the use of sample forms and in terms of speed,it has some advantages,for example, analytical speed, does not destroy the sample composition, detection of a wide range of stable and reliable results.In the field of geology and mineral resources industry, analysis of samples played a significant role.Especially in the field of real-time access the data. In this feature,now it's harder to be replaced by other analysis methods.The composition of Pb-Zn complex,often occurrence with various elements of an industrial value of non-ferrous metals lead, zinc, copper, nickel, cobalt, tungsten, molybdenum, cadmium, tin;Noble metals gold, silver;The availability of trace rare and dispersed elements gallium, indium, germanium, thallium, selenium, tellurium, rhenium.The complexity of its components directly affect the X-fluorescence analysis of lead-zinc in the accuracy of the main metal elements,to improve the level of lead-zinc prospecting and the utilization of mineral resources,extend the service life of existing mines.The need for fluorescence analysis by energy dispersive X need more in-depth discussion.This article describes the portable high-resolution energy dispersive X fluorescence analyzer in the lead-zinc metal element analysis of a variety of ways to determine the best working conditions and reduce interference between elements of content on the determination of the impact of such issues are studied.The project from the National 863 Program-" The development of the submarine in-situ X-ray probe analysis system "(No. 2006AA09Z219).To determine the micro-X-ray tube as excitation source for the energy dispersive X fluorescence analysis in measuring the time required to Lead the best working conditions,thus can get a more effective determination of analyte;Overlapping spectrum by processing, which can get the pure intensity measured elements;Through a variety of lead-zinc type of analysis, can the majority of Pb in the accurate analysis of the various metals.Established for most Pb, Zn ore model for the use of portable X-ray fluorescence analyzer in the multi-lead-zinc metal, lower detection limits, improve the accuracy of analysis provide a scientific basis.The main findings of this paper is as follows:(1) Obtained through theoretical analysis and experimental characteristics of peak area, peak background ratio changes as the tube voltage shows the trend,the characteristic peak area with the tube voltage increases, but the increasing trend of gradually slowing down;The peak to background beginning with the tube voltage increases, after reaching the maximum, continue to increase the pipe pressure, which will slowly decrease, and then basically become stable,when the tube voltage in the range of -10 ~ 30kV change;(2) Determined by the energy dispersive X-ray fluorescence analysis of Pb, Zn of the best working voltage of 26kV;(3)Corrected by subtracting background and mutual interference between lines, set a model of Pb, Zn X-ray fluorescence measuring ,increased Pb, Zn measurement accuracy.The results show that Pb, Zn, the average relative error within the limits prescribed of lead, zinc geological exploration norms;(4)The results shows that use the type of IED-2000T hand-held multi-element fast analyzer,when use the Si-PIN semiconductor detector (FWHM for the 178eV@5.9keV),Analysis of the accuracy grade lead-zinc for Pb (8.15% ~ 59.23%) of the average analysis error is 1.96%,the maximum relative error is 3.71%,the pass rate is 100%; the average analysis error is 5.02% for Pb (0.52% ~ 2.75%),the maximum relative error is 13.47%,the pass rate is 94.12%.The average analysis error is 7.77% for Zn (0.20% ~ 2.26%), the pass rate is 95.83%. |
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