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- Title
Mullite Synthesis Kinetics from Polydispersed Vibration-Milled Wastes of Commercial Corundum in the Presence of High-Silica Melt: Experimental and Modelling Results.
- Authors
Pruttskov, Dmytro; Sokol'skii, Vladimir; Bachurskyi, Denys; Goman, Sergei; Sokolsky, Georgii
- Abstract
The experimental kinetic data of mullite synthesis using commercial regular corundum vibration-milled wastes and silica by isothermal heat treatment were studied. The principle of diffusion flux symmetry to a convex surface was applied to perform theoretical analysis of partially and fully immersed quasispherical polydispersed particle interaction with a liquid phase (PAFIQPP method) to further derive the kinetic equations of mullite synthesis in the range of conversion degrees 0 < α < 0.75–0.85 assuming corundum dissolution as a limiting stage in the molten silicate. The rate constants and activation energy of the process were calculated and adequately approximated by the PAFIQPP method experimental data: the rate constant growth from 3.3 × 10–8 cm s−1 to 9.2 × 10−8 cm s−1 was observed in the temperature range 1350–1500 °C; the activation energy was 160 kJ/mol.
- Subjects
MULLITE; CORUNDUM; ACTIVATION energy; CONVEX surfaces; PARTICLE interactions; FUSED salts
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2021, Vol 73, Issue 7, p2225
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-021-04710-1