An overview on the production of pigment grade titania from titania-rich slag

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...

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Bibliographic Details
Published in:Waste management & research 2006-02, Vol.24 (1), p.74-79
Main Authors: Sahu, Kamala Kanta, Alex, Thomas C., Mishra, Devabrata, Agrawal, Archana
Format: Article
Language:English
Subjects:
Carbonitrides
Chemical properties
Chlorine - chemistry
Conservation of Natural Resources
Industrial Waste
Leaching
Metal wastes
Metallurgy
Oxides
Pigments
Production methods
Recycling
Slag
Slags
Sulfuric Acids - chemistry
Titanium
Titanium - chemistry
Titanium - isolation & purification
Titanium dioxide
Waste materials
Wastes
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Summary: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.
ISSN:0734-242X
1096-3669
0734-242X
DOI:10.1177/0734242X06061016