Determination of uranium in gravity concentration process sample of uranium-niobium-lead ore by inductively coupled plasma mass spectrometry
NI Wen-shan1,2,3,YAO Ming-xing1,2,3,GAO Xiao-fei1,2,3,ZHANG Hong-li1,2,3,XIAO Fang1,2,3,Lü Liang1,2,3
1.Zhengzhou Institute of Multipurpose Utilization of Mineral Resources,CAGS,Zhengzhou 450006,China; 2.China National Engineering Research Center for Utilization of Industrial Minerals,Zhengzhou 450006,China; 3.Key Laboratory of Evaluation and Multipurpose Utilization of Polymetallic Ores Ministry of Land and Resources,Zhengzhou 450006,China
Abstract：The determination method of uranium in gravity concentration process samples of uranium-niobium-lead ore (raw ore, concentrate, middling and tailing) by inductively coupled plasma mass spectrometry(ICP-MS) was established after dissolving the samples with HCl, HNO3, HF and HClO4. The mass spectrometry interference was eliminated by selecting proper isotope (238U). The non-mass spectrometry interference was eliminated by diluting the matrix (the mass concentration was below 0.30 mg/mL) and using 45 ng/mL 185Re as internal standard. The experimental results indicated that the mass spectrometry intensity of uranium showed good linear relationship with mass concentration in range of 5-60 ng/mL under the selected testing conditions. The correlation coefficient of calibration curve was r=0.999 2. The detection limit of method was 0.000 4 ng/mL. The proposed method was applied to the determination of uranium in actual gravity concentration process samples of uranium-niobium-lead ore (raw ore, concentrate, middling and tailing). The relative standard deviations (RSD, n=6) were between 0.80% and 3.9%, and the recoveries were between 102% and 106%. The content of uranium in three process samples of uranium-niobium-lead ore (raw ore, concentrate, middling and tailing) was determined according to the experimental method. The determination result was substituted into the law of conservation of mass to calculate the uranium content in the fourth sample. The determination result was compared with the calculation result to obtain the back-calculation rate of uranium content in the fourth sample. The results showed that the back-calculation rates were between 98% and 106%.
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NI Wen-shan,YAO Ming-xing,GAO Xiao-fei,ZHANG Hong-li,XIAO Fang,Lü Liang. Determination of uranium in gravity concentration process sample of uranium-niobium-lead ore by inductively coupled plasma mass spectrometry. , 2017, 37(5): 25-29.
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