University of Oulu

Wan, H., Lu, X., Luukkanen, S., Qu, J., Zhang, C., Chen, Y., Bu, X. (2022). Properties of flash roasted products from low-grade refractory iron tailings and improvement method for their magnetic separation index. Physicochemical Problems of Mineral Processing, 58(6), 156725.

Properties of flash roasted products from low-grade refractory iron tailings and improvement method for their magnetic separation index

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Author: Wan, He1,2; Lu, Xianlu1; Luukkanen, Saija2;
Organizations: 1School of Resources Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
2Oulu Mining School, University of Oulu, Oulu, FI-90014, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.9 MB)
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Language: English
Published: Politechnika Wroclawska Oficyna Wydawnicza, 2022
Publish Date: 2022-11-30


The properties of flash-roasted products from low-grade refractory iron tailings (IGRIT) and the improved method for their magnetic separation index were investigated by the MLA, XRD, iron phase analysis, and magnetic separation test. The results show the siderite and hematite in the IGRIT have been converted to magnetic iron after the flash roasting treatment with a time of 3‐5 s; magnetic iron in roasted products has a monomeric dissociation of 37.20%, and a 75‐100% exposed area of contiguous bodies as rich intergrowth was 29.83%, and that a 32.97 poor intergrowth; moreover, magnetic iron is mainly associated with muscovite and quartz. It is also found that the regrinding-magnetic separation (1500 Oe) treatment of the middling was beneficial to obtain more qualified iron concentrate products. Therefore, roasted products magnetic separation process in the absence/ presence of the middling regrinding-magnetic separation treatment obtains an iron concentrate with 60.10%/ 60.12% iron grade and 72.04%/81.13% iron recovery. The iron concentrate from the magnetic separation process with middling regrinding-magnetic separation can have a 9% higher recovery than the process without middling regrinding-magnetic separation. The work is significant for helping to improve the utilization of IGRIT.

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Series: Physicochemical problems of mineral processing
ISSN: 1643-1049
ISSN-E: 2084-4735
ISSN-L: 1643-1049
Volume: 58
Issue: 6
Article number: 156725
DOI: 10.37190/ppmp/156725
Type of Publication: B1 Journal article
Field of Science: 222 Other engineering and technologies
Funding: The authors are grateful for the financial support from Shaanxi Provincial Natural Science Basic Research Program (Grant No. 2019JLZ-05) in China, the Shaanxi Provincial Department of Education Service Local Special Project (Grant No.21JC021), the China Scholarship Council (Grant No. 202008610058), the Natural Science Foundation of Qinghai Province, China (Grant No. 2021-ZJ-975Q), Anhui Province Key Research and Development Program Project (Grant No. 202104a07020012).
Copyright information: © 2022 by the authors. Licensee Wroclaw University of Science and Technology, Poland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license.