Sanchez Segado, S, Lahiri, A and Jha, A (2014) Alkali roasting of bomar ilmenite: rare earths recovery and physico-chemical changes. Open Chemistry, 13 (1). 270 - 278. ISSN 2391-5420
Abstract
In this work, the alkali roasting of ilmenite (FeTiO3) is presented as a process route for integrated beneficiation of the mineral for rutile-rich phase and rare earth oxides; the latter is released as a consequence of physical changes in the ilmenite matrix, during the water leaching after roasting. The oxidative alkali roasting transforms ilmenite mineral into water-insoluble alkali titanate and water-soluble ferrite. After roasting the insoluble alkali titanate is separated from rare-earth oxide mixture in colloidal form and water-soluble ferrite. Further leaching of alkali titanate is carried out with oxalic (0.3M) and ascorbic (0.01M) acid solution which removes the remaining Fe2+ ions into the leachate and allows precipitation of high-purity synthetic rutile containing more than 95% TiO2. Iron is removed as iron oxalate. The physico-chemical changes occurred during the roasting and leaching processes are reported by comparing the role of alkali on the roasting process and product morphologies formed.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2015 Sergio Sanchez-Segado et al. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0). Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | Titanium; Rare Earth oxides; Leaching; Selective separation; Synthetic Rutile |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) > Institute for Materials Research (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 29 Jun 2015 14:37 |
Last Modified: | 15 Jan 2018 20:39 |
Published Version: | http://dx.doi.org/10.1515/chem-2015-0033 |
Status: | Published |
Publisher: | De Gruyter Open |
Identification Number: | 10.1515/chem-2015-0033 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:84657 |