Chemical and mineral transformation of a low grade goethite ore by dehydroxylation, reduction roasting and magnetic separation

Jang, Kyoung-oh, Nunna, Venkata R. M., Hapugoda, Sarath, Nguyen, Anh V. and Bruckard, Warren J. (2014) Chemical and mineral transformation of a low grade goethite ore by dehydroxylation, reduction roasting and magnetic separation. Minerals Engineering, 60 14-22. doi:10.1016/j.mineng.2014.01.021

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Author Jang, Kyoung-oh
Nunna, Venkata R. M.
Hapugoda, Sarath
Nguyen, Anh V.
Bruckard, Warren J.
Title Chemical and mineral transformation of a low grade goethite ore by dehydroxylation, reduction roasting and magnetic separation
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
1872-9444
Publication date 2014-01-01
Sub-type Article (original research)
DOI 10.1016/j.mineng.2014.01.021
Open Access Status Not Open Access
Volume 60
Start page 14
End page 22
Total pages 9
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Language eng
Subject 1909 Geotechnical Engineering and Engineering Geology
2210 Mechanical Engineering
1600 Chemistry
2207 Control and Systems Engineering
Abstract The utilization of abundant low grade goethite (α - FeOOH) ores is potentially important to many countries in the world, especially Australia. These ores contain many detrimental impurities and are difficult to upgrade to make suitable concentrates for the blast furnace. In this paper, chemical and mineral transformations of a goethite ore were studied by dehydroxylation, reduction roasting in CO and CO2 gas mixtures, and magnetic separation. The goethite sample was taken from a reject stream at an iron ore mine from the Pilbara region, Western Australia. The roasting temperature range investigated was 400-700 C. Chemical and mineralogical analysis was conducted using XRF, XRD, optical microscope, EPMA, and SEM. Magnetic separation was conducted using a Davis tube tester and a high intensity magnetic separator. The results show that reduction roasting can remove moisture and impurities but does not significantly change the Fe content in the feed. However, reduction roasting transforms goethite to hematite and eventually maghemite which can be recovered by magnetic separation, allowing upgrading. Further studies are needed to optimize the reduction roasting and correlate it with the magnetic separation to maximize the efficiency of iron upgrading.
Keyword Dehydroxylation
Goethite
Hematite
Magnetic separation
Magnetite
Reduction roasting
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2015 Collection
 
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