Determination of Rare Earth Elements in Barite-associated Rare Earth Ores by Alkaline Precipitation Separation-Inductively Coupled Plasma-Mass Spectrometry

DONG Xue-lin; HE Hai-yang; CHU Qin; QIU Xiu-mei; TANG Xing-min

doi:10.15898/j.cnki.11-2131/td.201901090004

Rock and Mineral Analysis > 2019 > 38(6): 620-630. > DOI: 10.15898/j.cnki.11-2131/td.201901090004

DONG Xue-lin, HE Hai-yang, CHU Qin, QIU Xiu-mei, TANG Xing-min. Determination of Rare Earth Elements in Barite-associated Rare Earth Ores by Alkaline Precipitation Separation-Inductively Coupled Plasma-Mass Spectrometry[J]. Rock and Mineral Analysis, 2019, 38(6): 620-630. DOI: 10.15898/j.cnki.11-2131/td.201901090004

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Determination of Rare Earth Elements in Barite-associated Rare Earth Ores by Alkaline Precipitation Separation-Inductively Coupled Plasma-Mass Spectrometry

1.
Hubei Province Geological Experimental Testing Center, Wuhan 430034, China
2.
Key Laboratory of Rare Mineral, Ministry of Land and Resources, Wuhan 430034, China
3.
School of Chemistry Engineering, Huazhong University of Science & Technology, Wuhan 430074, China

More Information

Received Date: January 08, 2019
Revised Date: April 28, 2019
Accepted Date: July 15, 2019
Published Date: October 31, 2019

Abstract

HIGHLIGHTS
(1) The content of rare earth elements in barite-associated rare earth ores was accurately determined.

(2) The separation of rare earth elements from barium and other coexistent elements was realized by precipitation of ammonium hydroxide after alkali fusion.

(3) The interference correction coefficient method was used for deducting the mass spectrum interferences of light rare earth elements on medium and heavy rare earth elements.

ABSTRACT

BACKGROUNDWhen inductively coupled plasma-mass spectrometry (ICP-MS) is used to determine the rare earth elements (REE) in the barite-associated light rare earth ores, Ba and light rare earth elements La, Ce, Pr, Nd, Sm, cause severe mass spectral overlap interference to the medium and heavy rare earths. Therefore, under the condition that complete digestion of oress, if the appropriate pretreatment method can be selected to achieve effective separation of the target elements from the matrix, it will be beneficial to reduce mass spectrum interferences.
OBJECTIVESTo reduce the mass spectrum interferences by establishing a simple and effective pretreatment method for separation of rare earth elements from barium and other coexisting elements in barite-associated rare earth ores.
METHODSThe barite-associated rare earth ores samples were fused with sodium peroxide and sodium carbonate. After dissolution of the fusion cake, the target REE and the undesired barium were precipitated in triethanolamine solution, but some matrix elements like Si, Fe, Mg, and Al in samples, and most fusion agents, were separated by filtration. The target REE were secondly precipitated in ammonium hydroxide after dissolution of the precipitates by acid, so that Ba, Sr and Ca could be separated from REE. The separation exceeds 96%, so the mass spectrum interferences caused by barium polyatomic ions were effectively reduced. In addition, the interference correction coefficients by measuring the interference concentration at m/z 138-175 of the high concentration lighter rare earths standard single element solution were adopted to account for the oxide and hydroxide overlap problem for the determination of middle and heavier rare earth elements.
RESULTSThe validity of the method was evaluated by analyses of rare earth ores certified reference materials and the results were in good agreement with certified values (|RE| < 10%). For the actual sample analysis of the barite-associated rare earth ores, the relative standard deviations (n=12) were from 0.5% to 4.6%, which proved that the method can be used to analyze rare earth elements in high-Ba ores.
CONCLUSIONSThe results demonstrate that this method is both practical and effective for rare earth elements analysis in barite-associated rare earth ores.
- barite,
- rare earth elements,
- sodium peroxide-sodium carbonate melting,
- precipitation separation,
- barium,
- inductively coupled plasma-mass spectrometry

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References (33)

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