Occurrence of Niobium and Rare Earth Elements in Related Ores by Electron Microprobe

WANG Fang; ZHU Dan; LU Li; WEI Jun-qi; PAN Shi-yang

doi:10.15898/j.cnki.11-2131/td.202006090086

Rock and Mineral Analysis > 2021 > 40(5): 670-679. > DOI: 10.15898/j.cnki.11-2131/td.202006090086

WANG Fang, ZHU Dan, LU Li, WEI Jun-qi, PAN Shi-yang. Occurrence of Niobium and Rare Earth Elements in Related Ores by Electron Microprobe[J]. Rock and Mineral Analysis, 2021, 40(5): 670-679. DOI: 10.15898/j.cnki.11-2131/td.202006090086

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Occurrence of Niobium and Rare Earth Elements in Related Ores by Electron Microprobe

WANG Fang^1,2,,
ZHU Dan^1,2,
LU Li^1,2,
WEI Jun-qi^1,2,
PAN Shi-yang^1,2

1.
Hubei Geological Research Laboratory, Wuhan 430034, China
2.
Key Laboratory of Rare Mineral, Ministry of Natural Resources, Wuhan 430034, China

More Information

Received Date: June 08, 2020
Revised Date: March 28, 2021
Accepted Date: August 19, 2021
Published Date: September 27, 2021

Abstract

HIGHLIGHTS
(1) The composition of the ore in the niobium-rare earth deposit was identified by polarizing light microscope.

(2) The relationship among niobium, rare earth minerals, and other minerals in the ore was determined by energy-dispersive spectrometry of electron microprobe.

(3) The chemical composition of main niobium and rare earth minerals was determined by wavelength-dispersive spectrometry of electron microprobe.

ABSTRACT

BACKGROUNDNiobium is a strategic metal with wide applications and plays a very important role in modern steel technology. The average content of Nb₂O₅ in a niobium-rare earth ore is 0.0855%, and the content of total rare earth (REO) is 1.03%, which is close to the minimum industrial grade requirement of niobium ore. Niobium minerals and rare earth minerals have the characteristics of small particles and complex intergrowths, which makes them difficult to find under a polarized microscope.
OBJECTIVESTo investigate the forms of niobium and rare earth elements.
METHODSElectron probe backscatter image, energy spectrum analysis and electron probe spectrum quantitative analysis were used to analyze niobium and rare-earth ore.
RESULTSNiobium mainly existed in the form of niobite and niobium-bearing rutile. The average content of Nb₂O₅ in niobite was 78.26% and that in niobium-bearing rutile was 5.26%. Rare earth elements mainly existed in the form of monazite, bastnaite and bastnaesite. The average content of rare earth elements (REO) in monazite, bastnaite and bastnaesite was 64.84%, 57.52% and 70.61%, respectively. Niobium and rare-earth minerals were distributed and dispersed. They were mostly trapped in the gangue minerals such as potassium feldspar, calcite and biotite.
CONCLUSIONSThe types and characteristics of the main niobium and rare earth minerals in the ore deposit were identified. This study has important guiding significance for the comprehensive utilization of niobium and rare earth deposits in the future.
- niobium and rare earth ore,
- mineral composition,
- occurrence,
- chemical composition,
- electron microprobe

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