Rapid determination of major and minor components in zinc concentrate by handheld X-ray fluorescence spectrometer
At present,the detection methods of zinc concentrate are mainly wet chemical methods.Howev-er,the sample preparation of these methods is complicated and the operation is cumbersome.Therefore,it is of great significance to find an accurate and rapid detection method for zinc concentrate to improve the detection efficiency.In this study,the handheld X-ray fluorescence spectrometer was employed for the rap-id detection of five major and minor components in zinc concentrate,including Zn,S,Fe,Ca and Pb.The samples were prepared by grinding and tableting.Different drying periods were set to explore the effect of moisture content.It was found that the higher the moisture content,the greater the relative error(RE)of the determination results.The relative error of Pb with lower content in the sample was up to 39.02％when the moisture content was the largest.Different ball milling time was also set to explore the influence of particle size,and it was found that the change of particle size had the greatest impact on S and Fe.The relative error reached 10.43％and 19.68％when the ball milling time was 3 h,respectively.Moreover,more accurate measurement results could be obtained for the sample with smaller particle size,the ball milling time of 9 h was determined.Different compression time was also investigated to explore the effect of tablet thickness,and the holding time of 60 s was determined in experiments.Four zinc concentrate samples were detected according to the experimental method.The relative standard deviations(RSD,n=5)of Zn,S,Fe and Ca were all less than 1.5％,and the RSD of Pb with lower element content was also less than 3％.The measured values of inductively coupled plasma optical emission spectrometry(ICP-OES)were used as reference values,and the measured values of the experimental methods were compared with the reference values.It was found that the relative errors of the detection results of all five elements was less than 10％,which could meet the requirements of routine analysis and detection.The proposed method had important reference value for the rapid detection of minerals.
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