In:
Clay Minerals, Mineralogical Society, Vol. 58, No. 1 ( 2023-03), p. 57-66
Abstract:
In this study, aluminium fluoride trihydrate (AlF 3 ⋅3H 2 O) was used to inhibit the sintering of calcined coal-series kaolin (CCSK). In addition, the oil absorption properties of CCSK were studied. The particle-size distribution, specific surface area and porosity of the samples were investigated as a function of calcination temperature and the addition of AlF 3 ⋅3H 2 O. Moreover, the ability of AlF 3 ⋅3H 2 O to improve the oil absorption of CCSK was explored. The morphology, structure and phase composition of the specimens were investigated using scanning electron microscopy and X-ray diffraction. The phase transition during heating of the samples was studied using thermogravimetric analysis. The preparation with 10 wt.% AlF 3 ⋅3H 2 O had the optimal sintering inhibition effect on CCSK at 1000°C. The release of SiF 4 gas during heating and the formation of mullite whiskers on the particle surface caused by AlF 3 ⋅3H 2 O moderated the formation of molten-phase liquid bridges between particles and inhibited sintering of the raw material powder. Furthermore, the formation of submicron mullite whiskers on the surface of the CCSK particles enhanced the oil-absorption properties of the sample significantly.
Type of Medium:
Online Resource
ISSN:
0009-8558
,
1471-8030
Language:
English
Publisher:
Mineralogical Society
Publication Date:
2023
detail.hit.zdb_id:
2036186-5
detail.hit.zdb_id:
961059-5
SSG:
13
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