电感耦合等离子体原子发射光谱法用于甘肃某矿区蓝晶石的物相分析  

Application of inductively coupled plasma atomic emission spectrometry in phase analysis of kyanite in a mining area of Gansu Province

作　　者：谢海东[1] 鲁海妍 杨晓文[1] 余志峰 方宏树 孔晓彦 XIE Haidong;LU Haiyan;YANG Xiaowen;YU Zhifeng;FANG Hongshu;KONG Xiaoyan(Qinghai Geological and Mineral Testing and Application Center,Xining 810021,China;Central Laboratory of Geology and Mineral Resources of Gansu Province,Lanzhou 730050,China)

机构地区：[1]青海省地质矿产测试应用中心,青海西宁810021 [2]甘肃省地矿中心实验室,甘肃兰州730050

出　　处：《冶金分析》2023年第2期46-53,共8页Metallurgical Analysis

基　　金：甘肃省肃北县鱼脊山蓝晶石矿普查项目(201802-D03)。

摘　　要：蓝晶石物相分析单纯采用化学分析无法满足地质要求,必须根据不同矿石成分进行实验。根据甘肃某矿区蓝晶石与其伴生矿物的组成特点,实验选择甘肃某矿区具有代表性的3个蓝晶石,前期采用立体双目显微镜挑选出蓝晶石单矿物,运用SY/T 5163—2018《沉积岩中黏土矿物和常见非黏土矿物X射线衍射分析方法》确定蓝晶石单矿物的性质与组成。蓝晶石经HF冷溶分解、过滤,残渣用Na_(2)O_(2)熔融,酸化后移至容量瓶中,再分取适量溶液于25 mL容量瓶中,介质为10%HNO_(3)。在分析谱线Al 308.215 nm处,使用电感耦合等离子体原子发射光谱法(ICP-AES)测定Al_(2)O_(3),再计算出蓝晶石的含量,从而建立了ICP-AES测定甘肃某矿区蓝晶石物相分析的方法。方法中Al_(2)O_(3)校准曲线的线性相关系数为0.999 9;检出限为0.002 3%,定量限为0.012%。按照实验方法测定模拟校准样品中蓝晶石,结果的相对标准偏差(RSD,n=11)为2.7%;加标回收率为96%~104%。经实际样品分析,与滴定法测定结果相吻合。The phase analysis of kyanite only by chemical analysis cannot meet the geological requirements. The experiments must be carried out according to the ore composition. Based on the composition characteristics of kyanite in a mining area of Gansu Province and its associated minerals, three representative samples of kyanite were selected. The kyanite mono-mineral was picked out using the stereobinocular microscope. The properties and composition of kyanite mono-mineral were determined by SY/T 5163-2018 Analysis method for clay minerals and ordinary non-clay minerals in sedimentary rocks by the X-ray diffraction. The kyanite sample was dissolved at low temperature with HF. After decomposition and filtration, the residue was melted with Na_(2)O_(2) followed by acidification. The solution was transferred into a volumetric flask. A proper volume of solution was sampled and diluted in 25 mL volumetric flask. The medium was 10% nitric acid. Al 308.215 nm was selected as the analytical line. The content of Al_(2)O_(3)was determined by inductively coupled plasma atomic emission spectrometry(ICP-AES) to calculate the content of kyanite. Thereby the method for the phase analysis of kyanite in a mining area of Gansu Province by ICP-AES was established. The linear correlation coefficient of Al_(2)O_(3)calibration curve was 0.999 9. The limit of detection was 0.002 3%, and the limit of quantification was 0.012%. The proposed method was applied for the determination of kyanite in simulated calibration sample. The relative standard deviation(RSD, n=11) was 2.7%, and the spiked recoveries were between 96% and 104%. The analysis results of actual sample were in good agreement with those obtained by the titrimetric method.

关 键 词：电感耦合等离子体原子发射光谱法(ICP-AES) 蓝晶石 物相分析 三氧化二铝 

分 类 号：O657.31[理学—分析化学] TF031[理学—化学] TF041[冶金工程—冶金物理化学]