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

2021 Vol. 40, No. 5

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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

Citation:

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

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

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

Received Date: 09 June 2020

Revised Date: 29 March 2021

Accepted Date: 20 August 2021

Publish Date: 28 September 2021

Abstract

Abstract

BACKGROUND
Niobium 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.
OBJECTIVES
To investigate the forms of niobium and rare earth elements.
METHODS
Electron probe backscatter image, energy spectrum analysis and electron probe spectrum quantitative analysis were used to analyze niobium and rare-earth ore.
RESULTS
Niobium 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.
CONCLUSIONS
The 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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References

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