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- Title
Preparation and Properties of Pseudo-boehmite Obtained from High-Alumina Fly Ash by a Sintering-CO<sub>2</sub> Decomposition Process.
- Authors
Lu, Guozhi; Zhang, Tingan; Feng, Wei; Zhang, Weiguang; Wang, Yanxiu; Zhang, Zimu; Wang, Long; Liu, Yan; Dou, Zhihe
- Abstract
A sintering-CO2 decomposition process for preparation of pseudo-boehmite is proposed for clean valorization of high-alumina fly ash. The effects of different synthesis conditions on the crystal structure and textual properties of the pseudo-boehmite were studied systematically. The results showed that the main product was NaAlCO3(OH)2 when the decomposition terminal pH was below 9.5, and the optimal terminal pH for the pseudo-boehmite (PB) product was 10.5. The optimal aging time was 4 h, and the peptization ratio of PB reached 97.5% when the aging temperature was 90°C. Under decomposition conditions of 30 g/L initial alumina concentration in liquid phase and temperature of 40°C, followed by 4 h of aging treatment, the specific surface area of PB was 425 m2/g. The pore volume of PB product reached 0.6920 cm3/g at decomposition conditions of 40 g/L and 30°C.
- Subjects
SINTERING; BOEHMITE; CRYSTAL structure; PEPTIZATION; TEMPERATURE
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2019, Vol 71, Issue 2, p499
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-018-3265-6