Determination of Rare Earth Oxides in Bauxite by Inductively Coupled Plasma-Optical Emission Spectrometry

HU Xuan

doi:10.15898/j.cnki.11-2131/td.201911260164

Rock and Mineral Analysis > 2020 > 39(6): 954-960. > DOI: 10.15898/j.cnki.11-2131/td.201911260164

HU Xuan. Determination of Rare Earth Oxides in Bauxite by Inductively Coupled Plasma-Optical Emission Spectrometry[J]. Rock and Mineral Analysis, 2020, 39(6): 954-960. DOI: 10.15898/j.cnki.11-2131/td.201911260164

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Determination of Rare Earth Oxides in Bauxite by Inductively Coupled Plasma-Optical Emission Spectrometry

HU Xuan

Chalco Zhengzhou Non-ferrous Metals Research Institute Co. LTD, Zhengzhou 450041, China

More Information

Received Date: November 25, 2019
Revised Date: February 12, 2020
Accepted Date: May 19, 2020
Published Date: October 31, 2020

Abstract

HIGHLIGHTS
(1) Rare earth elements in bauxite were separated after filtering and alkali fusion.

(2) Triethanolamine and disodium ethylenediamine tetra acetic acid were used for eliminating the interferences of matrix and co-existing elements on rare earth elements.

(3) Standard solution did not need matrix matching.

ABSTRACT

BACKGROUNDWhen the rare earth oxides in bauxite are determined by inductively coupled plasma-optical emission spectrometry (ICP-OES), acid dissolution often results in incomplete dissolution of samples, and a large amount of fluxes at high temperature alkali fusion will reduce the emission intensity of rare earth elements. Moreover, due to the low content of rare earth oxides (0.0010%-0.050%) and the matrix interferences such as aluminum and iron, accurate determination of them is difficult.
OBJECTIVESTo develop an accurate method to determine the contents of rare earth oxides in bauxite by ICP-OES.
METHODSThe bauxite was fused with sodium hydroxide, and the melt was extracted with hot water. A triethanolamine solution was used to eliminate the interferences of aluminum and iron, and ethylenediamine tetraacetate disodium solution was used to complex with calcium, magnesium and other elements. Rare earth hydroxide was retained in the precipitation, which was dissolved into the liquid hydrochloric acid digestion. Rare earth elements can be effectively separated from fluxes and matrix elements by the proposed procedure.
RESULTSThe standard solution did not need matrix matching. The linear correlation coefficient of calibration curve was not less than 0.9999, and the detection limits were 0.0002%-0.0015%. The relative standard deviations of rare earth elements in the sample were 2.0%-4.6%, and recoveries were 85.2%-104.4%.
CONCLUSIONSThere are no obvious differences for analytical results between ICP-OES and inductively coupled plasma-mass spectrometry (ICP-MS).

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Determination of Rare Earth Oxides in Bauxite by Inductively Coupled Plasma-Optical Emission Spectrometry

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