Application Study Of EDXRF Technology For Prospecting Of Muti-metal Mine

EDXRF(Energy-dispersive X-Ray Fluorescence) technology is one of thePhysical analytical technology,which uses the radial of radiealized isotope source orX-ray pipe to radiate the measured sample to emit X-ray fluorescence,and the energyand quantity of the radiance of the X-ray fluorescence decides the kinds and quantityof the measured element.Energy-dispersive X-Ray fluorescence spectrometer iswidely used in the fields of geology,metallurgy,architectural material and environment.This paper combined with the research at home and abroad of energy dispersiveX fluorescence analysis technology as well as the portable X-ray fluorescenceanalyzer,based on the digestion and absorption of qualitative and quantitative analysismethods of this technology,concludes the relative key technology of thismethods,including the energy scale,element identification,interference factors ofqualitative analysis and content computing formula,peak area computing,overlappingpeaks decomposition,the matrix effects and calibration methods,and makes analysisabout these technologies combined with the specific situation in the work.In theenergy calibration,we chose the two energy points of Cu and Pb to targetelements:8.047keV and 12.611keV for energy calibration.As a result of using asemiconductor detector,so we chose the full width of peaks in the calculation of peakarea,and expand 3 to 5 channels of low-energy side and the high-energy side forstudy,and use the linear method to get rid of the background and get the net peak areato calculate the content of elements.In the decomposition of overlapping peaks,we usethe artificial neural network approach to separate x-ray spectra,so that theseoverlapping X-ray spectra have been successfully separated,thus make an accurateanalysis of the target elements contents.Matrix effects is the main factors in aquantitative analysis of X fluorescence technology,therefore,it is particularlyimportant to correct matrix effects,in order to reduce matrix effects,we use standard samples at the local for equipment calibration,its matrix is as same as the samplesmeasured,thus greatly reducing the matrix effects,in addition,according to rocklithology of the working area and the past work,we estimate interference elementsmaybe existed in samples,correct the matrix effects for targeted,minimize matrixeffects on the measurement results possiblely and get relative accurate elementscontent.The paper has applied the portable X-ray fluorescence analyzer for prospecting ofmuti-metal mine in two regions in AnHui Jinxian Wuxi,its areas were 1km2 and2km2,getting more than 300 samples.We obtain the contents of Zn,Pb,Mo,As in eachsampling point through appling the X-ray fluorescence analysis technology,use surferto draw the equivalent diagram of Zn,Pb,Mo,As content,extract each element'sabnormal area,and compare with results of soil geochemical.Comparative results showthat the soil geochemical anomaly and X-ray fluorescence analysis anomaly have thesame features.Zn,Pb,Mo,As elements anomaly circle's location,shape and scope arebasically same in X fluorescence analysis,and coincide with the soil geochemicalanomaly circle,it indicated that these elements have a symbioticrelationship.Combined geological background of the work area and geochemicalexploration,AnHui nuclear exploration technology central institute do trenching invertical direction of mineralization in the four elements'abnormal regions,geologicaltrenching catalog shows the target elements have the mineralized phenomenon in Xfluorescenceanalysis anomalous regions,proving the results of X-fluorescenceanalysis are correct.They are ready to layout some drilling projects,carry out exposedeeply,so do further research and development of Wuxi mining and create moreeconomic benefits based on itThe portable X-ray fluorescence analyzer which developed by ChengduUniversity of Technology is set in electronic technology,computer technology andnuclear analytical method in one,with the characteristics of a high degree of computerbased,human-machine interface friendly and high-precision analysis,fast analysis andso on,applicable to all non-ferrous metals,black mines,beneficiation plant,smeltingplant,quality inspection station at the scene fast measurement analysis and geologicalprospecting,the scene surveying for rock outcrop,direct measurement of the drillcore,the tunnel wall and indoor powder measurement.The instrument uses the microX-ray tube as the excitation source,it launches a ray of high intensity,tunable energyand can increase the instrument sensitivity and detection limit,can take multi-elementmeasurement and analysis,the radioactive-ray will be dispeared after turning off the power,it is conducive to radiation protection and environmentally friendly.It usesadvanced power refrigeration semiconductor Si-PIN detector,energy resolution betterthan 150eV,making for a more convenient multi-elemental analysis.In datatransmission,we uses bluetooth wireless communication technology to replace theoriginal cable between the probe and the pocket PC with,making more convenient tocarry and use in the field.The results are drawed through the field-site investigationused the portable X-ray fluorescence analyzer that can show that:energy dispersive Xfluorescence analysis technology has a reliable theory base,its methods userfriendly,the portable X-ray fluorescence analyzer is cabinet and portable,can analysemulti-element analysis in field,has low detection limits,good energy resolution andhigh accuracy,its error analysis and measurement time is short,approaches the level ofindoor equipment.The energy-dispersive X-ray fluorescence analysis technology is afast,convenient,economical and effective muti-metal mine survey methods,it is worthpromoting.Through this field practical work,and combined with previous methods andtechniques used in the field of geological prospecting summary,this paper has formedthe specific work methods of the energy-dispersive X-ray fluorescence analysistechnology based on the portable X-ray fluorescence analyzer(CIT-3000SMP) in thefield of multi-metal mine exploration,including equipment preparation,measurementarea selection and arrangement of the measuring point,the field actual measurementsand data processing,etc,has provided a standardized work process for the muti-metallore investigation in the field scene,has practical significance.