Application of portable X-ray fluorescence spectrometer in the analysis of nickel and iron in Indonesia nickel laterite
GUO Linzhong1,2, WEI Ruijie1,2, WANG Fengliang1,2, SUI Menglai1,2
1. No.3 Institute of Geological & Mineral Resources Survey of Henan,Xinyang 464000, China; 2. Key Laboratory of Ecological Environmental Pollution Prevention and Restoration, Xinyang 464000, China
Abstract：The portable X-ray fluorescence spectrometer (PXRF) was employed to analyze the nickel laterite samples from a mine in Maluku, Indonesia. Consequently, an analytical method was established for rapid determination of the main elements (Ni and Fe) in nickel laterite. The sample was prepared with pressed powder pellet. Three condition variables including sample preparation pressure, particle size, and moisture content were optimized. The contents of Ni and Fe in the sample which were directly determined by PXRF at the ore Cu/Zn mode were used as determination values, while the contents of Ni and Fe in the same sample which were determined by potassium dichromate titration and inductively coupled plasma atomic emission spectrometry (ICP-AES) were used as reference values. Under the optimized experimental conditions, the contents of Ni and Fe in several representative nickel laterite samples at different layers were determined, including the residual slope accretion layer, weathered residual leaching layer, and weathered bedrock layer. The results showed that the relative standard deviations (RSD, n=9) were both not more than 2% for the determination values of Ni and Fe. Through the comparison of multiple sets of determination values and reference values, it was found that the determination values of Ni and Fe by PXRF were slightly higher than the reference values by chemical wet method. There was a certain systematic error. The determination values were corrected by binary linear equation regression calculation, and the relative error could be significantly reduced to less than 3%. The establishment of this analysis method for nickel laterite had more practical guiding significance for accurate nickel resource target division and reserve estimation for nickel laterite mines, which were lack of certified reference materials, from different regions and with complex composition.
郭林中, 韦瑞杰, 王丰亮, 隋孟来. 便携式X射线荧光光谱仪在分析印尼红土镍矿中镍和铁中的应用[J]. 冶金分析, 2022, 42(9): 48-54.
GUO Linzhong, WEI Ruijie, WANG Fengliang, SUI Menglai. Application of portable X-ray fluorescence spectrometer in the analysis of nickel and iron in Indonesia nickel laterite. , 2022, 42(9): 48-54.
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