Synthesis of rutile from high titania slag by pyrometallurgical route

A new technique was developed for the conversion of high titania slag, containing 70%-75% TiO 2 and with MgO, FeO, CaO, Al 2O 3 and SiO 2 as main impurities, into a synthetic rutile, 90%-95% TiO 2, which satisfies the requirements for fluidizing chlorination process with respect to impurity contents...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2011-10, Vol.21 (10), p.2317-2322
Main Authors: ZHANG, Li, LI, Guang-qiang, ZHANG, Wu
Format: Article
Language:English
Subjects:
China
Enrichment
Heat treatment
high titania slag
Impurities
leaching
oxidation
Rutile
Slags
Titanium
Titanium dioxide
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Summary:A new technique was developed for the conversion of high titania slag, containing 70%-75% TiO 2 and with MgO, FeO, CaO, Al 2O 3 and SiO 2 as main impurities, into a synthetic rutile, 90%-95% TiO 2, which satisfies the requirements for fluidizing chlorination process with respect to impurity contents. After a pre-oxidation at around 1 042 °C and a heat-treatment above 1 510 °C, the Ti components in high titania slag can be enriched into the rutile phase which can precipitate and grow, and can be separated with dilute hydrochloric and sulfuric acid, respectively. The results show that the average crystal size of rutile phase is over 25 μm, and the synthetic rutile containing more than 95% TiO 2 can be produced by selective leaching.
ISSN:1003-6326
DOI:10.1016/S1003-6326(11)61014-5