Effect of firing temperature and atmosphere on sintering of ceramics made from Bayer process bauxite residue

Bauxite residue, the principal waste from the Bayer process, was dried, pressed and studied for its thermal and sintering behaviour under different atmospheres, up to 1100 °C. For sintering in air and N 2, shrinkage begins at 800 °C and ranges from 2.6% to 13.9%, after firing at 1000–1100 °C. Bulk d...

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Bibliographic Details
Published in:Ceramics international 2009, Vol.35 (1), p.401-407
Main Authors: Pontikes, Y., Rathossi, C., Nikolopoulos, P., Angelopoulos, G.N., Jayaseelan, D.D., Lee, W.E.
Format: Article
Language:English
Subjects:
A. Sintering
Bauxite residue
Ceramics
Red mud
Thermal behaviour
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Summary:Bauxite residue, the principal waste from the Bayer process, was dried, pressed and studied for its thermal and sintering behaviour under different atmospheres, up to 1100 °C. For sintering in air and N 2, shrinkage begins at 800 °C and ranges from 2.6% to 13.9%, after firing at 1000–1100 °C. Bulk density varies from 1.7 to 2.3 g/cm 3 whereas water absorption from 31.5% to 17.7%. The main crystalline phases identified on firing in air were hematite (Fe 2O 3), gehlenite (Ca 2Al 2SiO 7) and perovskite (CaTiO 3) whereas magnetite (Fe 3O 4) was also found on firing in N 2. Microstructures are characterised by irregularly shaped,
ISSN:0272-8842
DOI:10.1016/j.ceramint.2007.11.013