Abstract：The grade of mineral resources is directly linked to the contents of tantalum and niobium in tantalite and niobite. Since uranium and thorium have radioactivity, their contents has attracted much attention. However, the current detection methods is complex and time-consuming.The mixed flux was prepared with lithium tetraborate and lithium metaborate in equal mass ratio. The artificial reference samples were prepared by high purity oxide fusion with ultra-low dilution ratio of 1∶20 and barium nitrate as oxidant. Hafnium and molybdenum were selected as the internal standard elements of tantalum and niobium, respectively. For the determination of uranium and thorium, the internal standards were not used. Thus, an analytical method of tantalum, niobium, uranium, and thorium in tantalite and niobite by wavelength dispersive X-ray fluorescence spectrometry was established. The results showed that the limit of detection for oxides of tantalum, niobium, uranium, and thorium was 0.016%, 0.006%, 0.003% and 0.004%, respectively. The linear ranges of calibration curves corresponding to the oxides reference samples were wide. The correlation coefficient was up to 0.999 9, 0.999 9, 0.999 1 and 0.999 3, respectively. The precision tests were conducted for determination of tantalite and niobite samples by proposed method. The relative standard deviation(RSD,n=10) for the determination results of each element oxides were as follows:tantalum pentoxide of 0.062%-0.38%, niobium pentoxide of 0.046%-0.18%, triuranium octoxide of 0.26%-0.52%, hafnium oxide of 0.27%-1.1%. The proposed method and inductively coupled plasma atomic emission spectrometry was applied in determination of tantalite and niobite samples for methods comparison, the results were consistent.
[1] 曹飞,杨卉芃,张亮,等.全球钽铌矿产资源开发利用现状及趋势[J].矿产保护与利用,2019(5):56-68. CAO Fei,YANG Huipeng,ZHANG Liang,et al.Current situation and trend analysis of global tantalum and niobium mineral resources[J].Conservation and Utilization of Mineral Resources,2019(5):56-68. [2] 王鑫,何东升,刘爽,等.铌钽矿选矿研究进展[J].现代矿业,2020(4):98-101. WANG Xin,HE Dongsheng,LIU Shuang,et al.Resear-ch progress of niobium tantalum ore beneficiation[J].Modern Mining,2020(4):98-101. [3] 杨远东,李继业,祝永平,等.刚果(金)马诺诺(Manono)东部某伟晶岩型铌钽矿地质特征[J].矿产勘查, 2020,11(7):1428-1435. YANG Yuandong,LI Jiye,ZHU Yongping,et al.Geological characteristics of a pegmatite niobium and tantalum deposit in the east of Manono, Congo(Kinshasa)[J].Mineral Exploration,2020,11(7):1428-1435. [4] 李美荣,李波,梁冬云,等.非洲某风化伟晶岩型钽铌矿石工艺矿物学及可选性研究[J].矿产综合利用,2020(6):135-141. LI Meirong,LI Bo,LIANG Dongyun,et al.Study on process mineralogy and separability of a weathered pegmatite type tantalum-niobium ore from Africa[J].Multipurpose Utilization of Mineral Resources,2020(6):135-141. [5] 中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.GB/T 17415.1—2010 钽矿石、铌矿石化学分析方法 第1部分:钽量测定[S].北京:中国标准出版社,2010. [6] 中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.GB/T 17415.2—2010 钽矿石、铌矿石化学分析方法 第2部分:铌量测定[S].北京:中国标准出版社,2010. [7] 陈静.X射线荧光光谱法测定地质样品中铌和钽的探讨[J].冶金分析,2015,35(10):24-29. CHEN Jing.Discussion on the determination of niobium and tantalum in geological samples by X-ray fluorescence spectrometry[J].Metallurgical Analysis,2015,35(10):24-29. [8] 周洪.X射线荧光光谱法测定中、酸性岩矿石中铷铌钽钨锡[J].中国金属通报,2019(8):177-180. ZHOU Hong.Determination of Rb, Nb, Ta, W, Sn in medium and acid rocks and ores by X-ray fluorescence spectrometry[J].China Metal Bulletin,2019(8):177-180. [9] 袁建,刘香英,夏晨光,等.熔融制样-X射线荧光光谱法测定产铀岩石中钨、钼、铌、钽、铁、磷、钒的标准方法[J].核化学与放射化学,2017,39(5):362-367. YUAN Jian,LIU Xiangying,XIA Chenguang,et al. Standard method for determination of W,Mo,Nb,Ta,Fe,P,V in uranium-productive rock by X-ray fluorescence spectrometry[J].Journal of Nuclear and Radiochemistry,2017,39(5):362-367. [10] 卓尚军.硼酸盐熔融的物理与化学[M].上海:华东理工大学出版社,2006:8-16.
