Cracking behavior and mechanism of gibbsite crystallites during calcination
Article
Article Title | Cracking behavior and mechanism of gibbsite crystallites during calcination |
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ERA Journal ID | 34937 |
Article Category | Article |
Authors | Zhang, Jinxuan (Author), Ge, Lei (Author), Chen, Zhi-Gang (Author), Boom, Eric (Author) and Zhu, Zhonghua (Author) |
Journal Title | Crystal Research and Technology: journal of experimental and industrial crystallography |
Journal Citation | 54 (1), pp. 1-7 |
Article Number | 1800201 |
Number of Pages | 7 |
Year | 2019 |
Place of Publication | Germany |
ISSN | 0232-1300 |
1521-4079 | |
Digital Object Identifier (DOI) | https://doi.org/10.1002/crat.201800201 |
Web Address (URL) | https://onlinelibrary.wiley.com/doi/full/10.1002/crat.201800201 |
Abstract | Cracking is one of the major contributors to the breakage of gibbsite particles during calcination, which generates superfine particles causing detrimental effects to the quality of product in the downstream smelter grade alumina production. Therefore, understanding the cracking behavior and mechanism can provide a solution to avoid the generation of superfine particles. In this study, for the first time, the phase transformation and structural evolutions from gibbsite to boehmite then to amorphous alumina during calcination via using focus ion beam–scanning electronic microscopy and in situ transmission electron microscopy are investigated. After detailed and real‐time observations, it is illustrated that the crack formation on gibbsite particles during calcination can be attributed to the stress introduced by crystal shrinkage inside the crystallites during the phase transformation. Moreover, cracks in calcined gibbsite crystallites are found to initiate as pores inside the crystallites, which grow toward the surface and then form open cracks. Studies will open the possibility to tune the breakage of gibbsite particles. |
Keywords | calcination, cracking behavior, cracking mechanism, gibbsite crystallite |
ANZSRC Field of Research 2020 | 401605. Functional materials |
Byline Affiliations | University of Queensland |
South32, Australia | |
Institution of Origin | University of Southern Queensland |
Funding source | Australian Research Council (ARC) |
https://research.usq.edu.au/item/q526x/cracking-behavior-and-mechanism-of-gibbsite-crystallites-during-calcination
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