Determination of tin in polymetallic ore by energy dispersive X-ray fluorescence spectrometry with powder pellet preparation
ZHANG Tao1,2, CHEN Zhaoyang3,4, CHEN Jingwei*5
1. No. 6 Geological Brigade of Shandong Provincial Bureau of Geology and Mineral Resources,Weihai 264209,China; 2. Shandong Provincial Engineering Laboratory of Application and Development of Big Data for Deep Gold Exploration, Weihai 264209,China; 3. Unit 31606 of PLA,Huzhou 313099,China; 4. School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013,China; 5. No. 4 Geological Brigade of Shandong Provincial Bureau of Geology and Mineral Resources,Weifang 261021,China
Abstract：The accurate determination of tin content in polymetallic ores is an important basis for obtaining tin reserves in ore deposits as well as formulating mining and beneficiation plans for polymetallic ores. The method of wet analysis for tin is time-consuming and tedious, which is not suitable for the batch inspection. 0.4 g of methyl cellulose was added into 4 g of sample as the binder for powder pellet preparation. The reference materials of polymetallic ores, metal ores, stream sediments and tin ores, and the self-made reference samples prepared by mixing these reference materials were used to form the calibration sample series with a certain gradient of tin content and matching sample matrix. The calibration curves were fitted. The empirical coefficient and Compton scattering internal standard method were adopted to correct the matrix effect. The method for determination of tin in polymetallic ores by energy dispersion-X-ray fluorescence spectrometry(ED-XRF) was established. The limit of detection of tin was 0.64 μg/g. The correctness of method was evaluated with the reference materials of polymetallic ore. It was found that the measured results were consistent with the certified values. When the tin content was in range of 2.49-15.7 μg/g, the relative standard deviations (RSDs) of determination results ranged from 9.7% to 5.7%. When the tin content was 1 700 μg/g, the RSD was 1.7%. Some polymetallic ore samples were selected, including copper-lead-zinc ore, copper-lead-molybdenum ore, copper-nickel-bismuth ore, lead-zinc-arsenic ore, and tungsten-tin-lead ore. 10 samples were prepared in parallel according to the experimental method for determination. Meanwhile, the samples were also determined by atomic fluorescence spectrometry in GB/T 14353.19-2019 for method comparison. The results showed that the measured results of the experimental method were basically consistent with those obtained by the standard method. The relative standard deviation (n=10) was 4.9%-13.4% when the content of Sn was 2.1-88 μg/g. When the content of Sn ranged from 88 to 9 878 μg/g, the RSDs (n=10) were between 0.53% and 4.9%. The proposed method was suitable for the detection of tin (3 μg/g to 1.27%) in polymetallic ore samples.
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