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  

Application of portable X-ray fluorescence spectrometer in the analysis of nickel and iron in Indonesia nickel laterite

作　　者：郭林中 韦瑞杰 王丰亮[1,2] 隋孟来 GUO Linzhong;WEI Ruijie;WANG Fengliang;SUI Menglai(No.3 Institute of Geological&Mineral Resources Survey of Henan,Xinyang 464000,China;Key Laboratory of Ecological Environmental Pollution Prevention and Restoration,Xinyang 464000,China)

机构地区：[1]河南省地质矿产勘查开发局第三地质矿产调查院,河南信阳464000 [2]河南省信阳市生态环境污染防治与修复重点实验室,河南信阳464000

出　　处：《冶金分析》2022年第9期48-54,共7页Metallurgical Analysis

摘　　要：使用便携式X射线荧光光谱仪(PXRF)对印度尼西亚马鲁古省某矿山红土镍矿样品进行分析,建立了快速测定红土镍矿中主要元素Ni、Fe的分析方法。方法采用粉末压片制样,并对粉末压片制样压力、样品粒度、含水率等3个条件变量进行优化,以PXRF在矿石Cu/Zn模式下直接测量样品中Ni、Fe的含量作为测定值,同时用重铬酸钾滴定法及电感耦合等离子体原子发射光谱法(ICP-AES)测试同一样品中Ni、Fe的含量作为参考值。在优化后的实验条件下,对红土镍矿样品不同层位有代表性地选择残坡积层、风化残积淋滤层、风化基岩层中Ni、Fe进行测定,结果表明,Ni、Fe测定值的相对标准偏差(RSD,n=9)均不大于2%。通过多组测定值和参考值比对,发现PXRF测试Ni、Fe的测定值略高于化学湿法的参考值,具有一定的系统误差。测定值经二元线性方程回归计算校正后,相对误差明显减小至均小于3%。此红土镍矿分析方法的建立,对缺乏标样、不同地区、组分复杂的红土镍矿矿山准确进行镍资源靶区划分、储量估算更具现实指导意义。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.

关 键 词：红土镍矿 便携式X射线荧光光谱仪(PXRF) 二元线性方程 镍 铁 

分 类 号：O657.34[理学—分析化学] TF031[理学—化学]