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Beneficiation of Low-Grade Rare Earth Ore from Khalzan Buregtei Deposit (Mongolia) by Magnetic Separation

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Title: Beneficiation of Low-Grade Rare Earth Ore from Khalzan Buregtei Deposit (Mongolia) by Magnetic Separation
Authors: Park, Ilhwan Browse this author →KAKEN DB
Kanazawa, Yuki Browse this author
Sato, Naoya Browse this author
Galtchandmani, Purevdelger Browse this author
Jha, Manis Kumar Browse this author
Tabelin, Carlito Baltazar Browse this author
Jeon, Sanghee Browse this author →KAKEN DB
Ito, Mayumi Browse this author →KAKEN DB
Hiroyoshi, Naoki Browse this author →KAKEN DB
Keywords: rare earth elements
magnetic separation
Khalzan Buregtei deposit
Issue Date: Dec-2021
Publisher: MDPI
Journal Title: Minerals
Volume: 11
Issue: 12
Start Page: 1432
Publisher DOI: 10.3390/min11121432
Abstract: The global demand for rare earth elements (REEs) is expected to increase significantly because of their importance in renewable energy and clean storage technologies, which are critical for drastic carbon dioxide emission reduction to achieve a carbon-neutral society. REE ore deposits around the world are scarce and those that have been identified but remain unexploited need to be developed to supply future demands. In this study, the Khalzan Buregtei deposit located in western Mongolia was studied with the aim of upgrading low-grade REE ore via magnetic separation techniques. The total REE content in this ore was _*_6720 ppm (_*_3540 ppm light REE (LREE) + _*_3180 ppm heavy REE (HREE)) with bastnaesite, pyrochlore, synchysite, and columbite-(Fe) identified as the main REE-bearing minerals. As the particle size fraction decreased from -4.0 + 2.0 mm to -0.5 + 0.1 mm, the recovery by dry high-intensity magnetic separation (DHIMS) increased from 20% to 70% of total rare earth oxide (TREO) while the enrichment ratio reached 2.8 from 1.3. Although effective, gangue minerals such as quartz and aluminosilicates were recovered (_*_22%) due most likely to insufficient liberation. Meanwhile, the wet high-intensity magnetic separation (WHIMS) could produce a magnetic concentrate with TREO recovery of _*_80% and enrichment ratio of 5.5 under the following conditions: particle size fraction, -106 + 75 mu m; feed flow rate, 3.2 L/min; magnetic induction, 0.8 T. These results indicate that combining DHIMS and WHIMS to upgrade the low-grade REE ore from the Khalzan Buregtei deposit is an effective approach.
Rights: © 2021 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution License (
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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