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- Title
The Effect of the Mode of Heat Treatment and Mechanoactivation of Kaolinite on Mullite Formation.
- Authors
Filatova, N. V.; Kosenko, N. F.; Badanov, M. A.
- Abstract
The effect of the rate of heating of kaolinite Al4[Si4O10](OH)8 on its transformation into mullite 3Al2O3 · 2SiO2 has been studied. The mullite yield increases with the heating rate. The temperature rise at a high rate promotes rapid dehydration of kaolinite, which is accompanied by detachment of hydroxo groups and structural disordering. The effects of preliminary mechanoactivation of kaolin in a ball-and-ring mill, which abrases a material, and in a planetary mill, in which shock loads dominate, have been compared. It has been established that attrition treatment is ineffective. The intense impact-abrasion treatment in a planetary mill breaks up packets and layers; a part of hydroxo groups appear on the outer surface of polycrystallites, which facilitates dehydroxylation.
- Subjects
MULLITE; KAOLINITE; KAOLIN
- Publication
Technical Physics Letters, 2023, Vol 49, Issue 7, p81
- ISSN
1063-7850
- Publication type
Article
- DOI
10.1134/S1063785023700025