Revealing cracking and breakage behaviours of gibbsite particles
Article
Article Title | Revealing cracking and breakage behaviours of gibbsite particles |
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ERA Journal ID | 4877 |
Article Category | Article |
Authors | Zhang, Jinxuan (Author), Ge, Lei (Author), Chen, Zhi-Gang (Author) and Zhu, Zhonghua (Author) |
Journal Title | Ceramics International |
Journal Citation | 47 (4), pp. 4625-4632 |
Number of Pages | 8 |
Year | 2021 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 0272-8842 |
1873-3956 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.ceramint.2020.10.029 |
Abstract | Mitigating gibbsite particle cracking and breakage during industrial alumina production can increase the quality of smelter grade alumina product by reducing the ultrafine particle content. Therefore, it is essential to investigate the particle cracking during static calcination and the breakage of calcined gibbsite particles under external force. In this work, we investigated the impact of the calcination ramping rate and the crystallite size on gibbsite particle cracking during static calcination. A slow ramping rate and a large pristine crystallite size tend to increase particle cracking. Apart from the study of particle cracking behaviour, we also investigated the breakage of calcined gibbsite particle under external force. Cracks on the particle surface can initiate breakage within the crystallite and along the grain boundary under external force. The breakage within crystallite occurs as the cleavage of the crystallite, while the breakage along the grain boundary leads to the shedding of a whole crystallite. We further explored the factors influencing the strength of calcined gibbsite particles. With increasing calcination temperature, the strength of particle increases when gibbsite converts to boehmite, and then decreases when boehmite converts into amorphous alumina. Particles containing smaller crystallites and calcined with fast ramping rates exhibit higher resistance to breakage. |
Keywords | gibbsite particle; calcination; cracking; breakage |
ANZSRC Field of Research 2020 | 400406. Powder and particle technology |
340301. Inorganic materials (incl. nanomaterials) | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | University of Queensland |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q62w8/revealing-cracking-and-breakage-behaviours-of-gibbsite-particles
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