Alkali roasting of bomar ilmenite: rare earths recovery and physico-chemical changes

• Authors: Sergio Sanchez-Segado , Abhishek Lahiri , Animesh Jha
• Languages of publication: EN

Abstracts

EN

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.

Keywords

EN

Titanium; Rare Earth oxides; Leaching; Selective separation; Synthetic Rutile

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2015
• Volume: 13
• Issue: 1

Dates

online

1 - 11 - 2014

accepted

6 - 4 - 2014

received

7 - 2 - 2014

Contributors

author

Sergio Sanchez-Segado

• Institute for Materials Research, Houldsworth Building, University of Leeds, Leeds LS2 9JT, UK

author

Abhishek Lahiri

• Institute of Electrochemistry, Clausthal University of Technology, 38678 Clausthal-Zellerfeld, Germany

author

Animesh Jha

• Institute for Materials Research, Houldsworth Building, University of Leeds, Leeds LS2 9JT, UK

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Identifiers

DOI

10.1515/chem-2015-0033