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

YAN Shuang; HUANG Kang-jun; FU Yong; BAO Zhi-an; MA Long; LONG Ke-shu; YE Yuan-mou; CHEN Rui; CHEN Man-zhi

doi:10.15898/j.cnki.11-2131/td.2019081201275

Rock and Mineral Analysis > 2020 > 39(1): 41-52. > DOI: 10.15898/j.cnki.11-2131/td.2019081201275

YAN Shuang, HUANG Kang-jun, FU Yong, BAO Zhi-an, MA Long, LONG Ke-shu, YE Yuan-mou, CHEN Rui, CHEN Man-zhi. 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

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

YAN Shuang^1,2,,
HUANG Kang-jun³,
FU Yong^1,2,4, ,,
BAO Zhi-an³,
MA Long³,
LONG Ke-shu^1,2,
YE Yuan-mou^1,2,
CHEN Rui^1,2,
CHEN Man-zhi^1,2

1.
College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China
2.
Key Laboratory of Karst Georesources and Environment, Ministry of Education, Guizhou University, 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

More Information

Received Date: August 11, 2019
Revised Date: September 11, 2019
Accepted Date: October 20, 2019
Published Date: December 31, 2019

Abstract

HIGHLIGHTS
(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.

ABSTRACT

BACKGROUNDBauxite 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.
OBJECTIVESTo establish a method for separating and purifying lithium in bauxite for Li isotope analysis.
METHODSOn the basis of previous studies, the separation, purification, and measurement scheme of Li in bauxite were investigated by leaching experiment.
RESULTSIn 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).
CONCLUSIONSThe purification method reduces the amount of eluent used and improves experimental efficiency.
- bauxite,
- associated lithium,
- separation and purification,
- Li isotope,
- MC-ICP-MS,
- standard materials

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