【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. The Establishment of Methods for Separating and Purifying Lithium Isotopes in Bauxite[J]. Rock and Mineral Analysis, 2020, 39(1): 41-52. doi: 10.15898/j.cnki.11-2131/td.2019081201275

铝土矿中锂同位素分离提纯方法的建立

1. 贵州大学资源与环境工程学院, 贵州 贵阳 550025;

2. 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;

3. 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;

4. 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 

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。。

The Establishment of Methods for Separating and Purifying Lithium Isotopes in Bauxite

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

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

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

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

Received Date: 2019-08-12
Revised Date: 2019-09-12

摘要:铝土矿是极端风化作用的产物,也是锂的重要载体。由于其资源量巨大,对铝土矿中锂的富集机制和分布规律的研究将有利于找矿预测。锂同位素的高效准确的分析是深入认识矿中锂的富集机制和分布规律的基础。铝土矿样品由于化学稳定性较强,溶样过程较为复杂,且Al、Na、Ca、K等基体元素含量远高于锂,给锂的纯化增加不少难度。本文采用内径5mm、柱长190mm的聚四氟乙烯离子交换柱和AG50W-X12阳离子交换树脂,以0.5mol/L硝酸为淋洗液,淋洗34mL、收集最后的12mL,即可完成对铝土矿中锂的完全纯化回收。该纯化方法减少了淋洗液的使用量、提高了实验效率。同时,采用该方法对国际标样L-SVEC、RGM-2、GSP-2进行锂的纯化,通过多接收电感耦合等离子体质谱仪(MC-ICP-MS)测试其同位素组成,得到的δ7Li测试值分别为-0.26‰±0.09‰(2SD,n=3)、3.19‰±0.37‰(2SD,n=3)、-0.78‰±0.22‰(2SD,n=3),与前人报道一致,验证了该方法的可靠性。此外,采用本方案对铝土矿标样(GBW07182)进行锂的纯化,δ7Li测定值为10.16‰±0.21‰(2SD,n=3)。

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

The Establishment of Methods for Separating and Purifying Lithium Isotopes in Bauxite

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

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Figures And Tables

铝土矿中锂同位素分离提纯方法的建立

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