Revealing cracking and breakage behaviours of gibbsite particles

Zhang, Jinxuan and Ge, Lei ORCID: and Chen, Zhi-Gang ORCID: and Zhu, Zhonghua (2021) Revealing cracking and breakage behaviours of gibbsite particles. Ceramics International, 47 (4). pp. 4625-4632. ISSN 0272-8842

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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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Submitted Version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 03 Feb 2021 01:30
Last Modified: 22 Jun 2021 11:11
Uncontrolled Keywords: gibbsite particle; calcination; cracking; breakage
Fields of Research (2008): 03 Chemical Sciences > 0303 Macromolecular and Materials Chemistry > 030304 Physical Chemistry of Materials
09 Engineering > 0912 Materials Engineering > 091201 Ceramics
Fields of Research (2020): 40 ENGINEERING > 4004 Chemical engineering > 400406 Powder and particle technology
34 CHEMICAL SCIENCES > 3403 Macromolecular and materials chemistry > 340301 Inorganic materials (incl. nanomaterials)
Socio-Economic Objectives (2020): 24 MANUFACTURING > 2403 Ceramics, glass and industrial mineral products > 240302 Ceramics
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