【引用本文】 严爽, 黄康俊, 付勇, 等. 铝土矿中锂同位素分离提纯方法的建立[J]. 岩矿测试, 2020, 39(1): 41-52. doi: 10.15898/j.cnki.11-2131/td.2019081201275
YAN Shuang, HUANG Kang-jun, FU Yong, et al. Development of Separating and Purifying Methods for Lithium Isotope Analysis of Bauxite[J]. Rock and Mineral Analysis, 2020, 39(1): 41-52. doi: 10.15898/j.cnki.11-2131/td.2019081201275



贵州大学资源与环境工程学院, 贵州 贵阳 550025


贵州大学喀斯特地质资源与环境教育部重点实验室, 贵州 贵阳 550025


西北大学地质学系, 大陆动力学国家重点实验室, 陕西 西安 710069


中国地质科学院矿产资源研究所, 北京 100037

收稿日期: 2019-08-12  修回日期: 2019-09-12  接受日期: 2019-10-21

基金项目: 国家重点研发计划深地资源勘查开采专题(2017YFC0602701);中国地质调查局中国矿产地质志项目(DD20160346,DD20190379);贵州省人才基地项目(RCJD2018-21)

作者简介: 严爽, 硕士研究生, 地质学专业。E-mail:yanshuang1031@163.com

通信作者: 付勇, 博士, 副教授, 主要从事矿床地球化学及相关研究。E-mail:byez1225@126.com

Development of Separating and Purifying Methods for Lithium Isotope Analysis of Bauxite


College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China


Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, Guiyang 550025, China


State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China


Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China

Corresponding author: FU Yong, byez1225@126.com

Received Date: 2019-08-12
Revised Date: 2019-09-12
Accepted Date: 2019-10-21


关键词: 铝土矿, 伴生锂, 分离提纯, 锂同位素, MC-ICP-MS, 标准物质


(1) 以0.5mol/L硝酸为淋洗液,收集12mL即可完成对锂的完全纯化回收。

(2) 纯化后的溶液Na/Li(质量比)<1,Na对锂同位素测试的干扰可以忽略。

(3) 本研究适用于沉积岩特别是铝土矿的锂同位素分析。

Development of Separating and Purifying Methods for Lithium Isotope Analysis of Bauxite



Bauxite is a product from extreme weathering, an important carrier of lithium. Due to its huge resources, the study on the mechanism and distribution of lithium in bauxite will be beneficial to the prospecting and prediction of bauxite deposits. Efficient and accurate analysis of lithium isotopes is the basis for deep understanding of the lithium enrichment mechanism and distribution driplines in the ores. The bauxite samples are more chemically stable and the sample dissolution process is more complicated. The content of matrix elements such as Al, Na, Ca and K is much higher than that of Li, which makes it difficult to purify Li.


To establish a method for separating and purifying lithium in bauxite for Li isotope analysis.


On the basis of previous studies, the separation, purification, and measurement scheme of Li in bauxite were investigated by leaching experiment.


In this scheme, polytetrafluoroethylene exchange column with an inner diameter of 5mm and a column length of 190mm, and AG50W-X12 cation exchange resin were used. 34mL of 0.5mol/L nitric acid was used as the eluent and the final solution was 12mL, resulting in complete purification and recovery of Li in bauxite. At the same time, the method was used to purify the Li in international standard samples, L-SVEC, RGM-2 and GSP-2, and the values of δ7Li were measured by MC-ICP-MS, which were -0.26‰±0.09‰ (2SD, n=3), 3.19‰±0.37‰ (2SD, n=3), -0.78‰±0.22‰ (2SD, n=3). The analytical results were consistent with the previous results obtained by other methods, verifying the reliability of this method. The proposed method was used to purify bauxite standard sample, GBW07182, which yielded δ7Li of 10.16‰±0.21‰ (2SD, n=3).


The purification method reduces the amount of eluent used and improves experimental efficiency.

KEY WORDS: bauxite, associated lithium, separation and purification, Li isotope, MC-ICP-MS, standard materials


(1) 12mL 0.5mol/L nitric acid as eluent can reach complete purification and recovery of Li.

(2) Na/Li (mass ratio) < 1 after purification and the interference of Na on the analysis of Li isotopes can be ignored.

(3) The proposed method was applicable to Li isotope analysis of sedimentary rocks, especially bauxite.



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严爽, 黄康俊, 付勇, 包志安, 马龙, 龙克树, 叶远谋, 陈蕤, 陈满志