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Metallurgical and Materials Transactions B
Published in: Metallurgical and Materials Transactions B 6/2007

01-12-2007

Kinetics and Reaction Mechanism of Soda Ash Roasting of Ilmenite Ore for the Extraction of Titanium Dioxide

Authors: Abhishek Lahiri, Animesh Jha

Published in: Metallurgical and Materials Transactions B | Issue 6/2007

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Abstract

Ilmenite by virtue of being rich in iron often has small concentrations of impurities such as Mn3O4, Al2O3, CaO, Cr2O3, and MgO. Removal of iron and other impurities is essential for the production of pigment grade TiO2. An investigation of the removal of iron was undertaken by roasting the mineral ilmenite with soda ash in air above 873 K. A ternary phase was identified, which played an important role in the overall kinetics. The dependence of temperature, time, mixture composition, and the microstructure of the reaction layer were studied in order to establish the reaction mechanism. We report the results of overall kinetics of roasting reaction by analyzing the activation energy in the temperature range of 873–1173 K and also explain the reaction mechanism. The derived value of activation barrier compares well with the diffusion rates of Fe2+ and Fe3+ ions in the ilmenite lattice.
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Footnotes
1
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Metadata
Title
Kinetics and Reaction Mechanism of Soda Ash Roasting of Ilmenite Ore for the Extraction of Titanium Dioxide
Authors
Abhishek Lahiri
Animesh Jha
Publication date
01-12-2007
Publisher
Springer US
Published in
Metallurgical and Materials Transactions B / Issue 6/2007
Print ISSN: 1073-5615
Electronic ISSN: 1543-1916
DOI
https://doi.org/10.1007/s11663-007-9095-5

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