Details

Autor(en) / Beteiligte

• Li, Jiaquan
• Huang, Zhiwei
• Wang, Qian
• Zhang, Fengnian
• Miao, Yang
• Gao, Feng

Titel

Sintering inhibition and oil-absorption properties of calcined coal-series kaolin

Ist Teil von

• Clay minerals, 2023-03, Vol.58 (1), p.57-66

Ort / Verlag

Middlesex: Cambridge University Press

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.