Determination of Lithium, Gallium, Zirconium, Rare Earth Elements and Other Trace Elements in Corundum-bearing Bauxite by Inductively Coupled Plasma-Mass Spectrometry with Rapid Decomposition of Ammonium Bifluoride

LIU Gui-lei; XU Chun-xue; CHEN Zong-ding; WEN Hong-li

doi:10.15898/j.cnki.11-2131/td.202003120031

Rock and Mineral Analysis > 2020 > 39(5): 670-681. > DOI: 10.15898/j.cnki.11-2131/td.202003120031

LIU Gui-lei, XU Chun-xue, CHEN Zong-ding, WEN Hong-li. Determination of Lithium, Gallium, Zirconium, Rare Earth Elements and Other Trace Elements in Corundum-bearing Bauxite by Inductively Coupled Plasma-Mass Spectrometry with Rapid Decomposition of Ammonium Bifluoride[J]. Rock and Mineral Analysis, 2020, 39(5): 670-681. DOI: 10.15898/j.cnki.11-2131/td.202003120031

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Determination of Lithium, Gallium, Zirconium, Rare Earth Elements and Other Trace Elements in Corundum-bearing Bauxite by Inductively Coupled Plasma-Mass Spectrometry with Rapid Decomposition of Ammonium Bifluoride

National Research Center for Geoanalysis, Beijing 100037, China

More Information

Received Date: March 11, 2020
Revised Date: April 07, 2020
Accepted Date: May 12, 2020
Published Date: August 31, 2020

Abstract

HIGHLIGHTS
(1) NH₄HF₂ was used as a flux, which solved the problem of incomplete decomposition of corundum-containing bauxite by four-acid, five-acid and closure pressure acid dissolution methods.

(2) The optimum temperature, time and reagent dosage of NH₄HF₂ to decompose corundum-bearing bauxite were determined.

(3) The study was applicable to trace element analysis of bauxite, especially high-alumina and corundum-bearing bauxite.

ABSTRACT

BACKGROUNDBauxite is often accompanied by useful components such as lithium, gallium, zirconium, and rare earth metals. Complete extraction and accurate determination of the content of these components are of great significance for the comprehensive evaluation and comprehensive utilization of bauxite resources. However, bauxite often contains a small amount of corundum, which is not completely decomposed by the conventional four-acid, five-acid and closure pressure acid dissolution methods, resulting in lower measurement results.
OBJECTIVESTo explore the new decomposition method to achieve rapid and accurate analysis of trace elements in corundum- bearing bauxite.
METHODSA digestion technique using the solid compound ammonium bifluoride in a screw-capped PFA vial at high temperature has been developed for trace elements analysis of corundum-bearing bauxite by using a small amount of sulfuric acid during the fusion process. The factors such as different melting temperature, digestion time and reagent dosage were investigated in detail, the optimal smelting conditions (200℃, 3h, sample ratio 4:1) were confirmed. An analytical method for determination of 37 trace elements in corundum-bearing bauxite by inductively coupled plasma-mass spectrometry with rapid decomposition of ammonium bifluoride was established.
RESULTSThis method can be used to quickly and effectively decompose corundum-bearing bauxite, which has been verified by three national bauxite standard materials GBW07177, GBW07181 and GBW07182. The proposed method was also compared with the results of the four-acid, five-acid and closure pressure acid dissolution methods. The recoveries of nine elements such as Li, Ga, Sr, Zr and Pb in the three standard materials were from 95.0% to 115.0%, 90.0% to 110.0%, and 90.0% to 110.0%, respectively. The analytical result was in agreement with the certified values. The detection limits of the method were from 0.002 to 0.43μg/g, which was closely equivalent to the detection limits (0.000-0.48μg/g) of the traditional nitric acid-hydrofluoric acid closure digestion method. The precisions were from 1.14% to 8.84%, which qualified it to meet the analytical requirements of trace elements in bauxite.
CONCLUSIONSThis method can be used to achieve accurate analysis of major elements such as Al, Ti, and P in bauxite (Al₂O₃ content between 42.97% and 90.36%), which further verifies the accuracy of this method for the determination of trace elements in bauxite.
- ammonium bifluoride,
- rapid decomposition,
- inductively coupled plasma-mass spectrometry,
- corundum-bearing bauxite,
- trace elements

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Determination of Lithium, Gallium, Zirconium, Rare Earth Elements and Other Trace Elements in Corundum-bearing Bauxite by Inductively Coupled Plasma-Mass Spectrometry with Rapid Decomposition of Ammonium Bifluoride