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Waste Management & Research
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An overview on the production of pigment grade titania from titania-rich slag

Kamala Kanta Sahu

Metal Extraction and Forming Division, National Metallurgical Laboratory, Jamshedpur, India

Thomas C. Alex

Metal Extraction and Forming Division, National Metallurgical Laboratory, Jamshedpur, India

Devabrata Mishra

Metal Extraction and Forming Division, National Metallurgical Laboratory, Jamshedpur, India

Archana Agrawal

Metal Extraction and Forming Division, National Metallurgical Laboratory, Jamshedpur, India, archana_nml03{at}yahoo.com

To recover pigment grade TiO2, operating plants all over the world use chemical processes. Slag-based technology is considered to be attractive because of low waste generation and low chemical cost due to high titanium content and is poised to replace the conventional technology. This paper provides a review of the slag-based technology with the specific aim to produce leachable slag and achieving high titania yield from recovered wastes. Leachable oxides of the lower oxidation state, such as TiO and Ti2O3, facilitate the leaching process. However, during smelting these oxides increase the viscosity of the slag. Formation of titanium carbide or carbonitride is also not desirable as it leads to resistance to the leaching of titanium. This report highlights the problems and their possible solutions to obtain leachable slag.

Key Words: Titania • slag • pigment • leaching • ilmenite • rutile • wmr 810-4

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Waste Management & Research, Vol. 24, No. 1, 74-79 (2006)
DOI: 10.1177/0734242X06061016
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This Article
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Right arrow Articles by Sahu, K. K.
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PubMed
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Right arrow Articles by Agrawal, A.
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What's this?