Wet size measurements for the evaluation of the deagglomeration behaviour of spray-dried alumina powders in suspension. Issue 6 (15th March 2022)

• Record Type: Journal Article
• Authors: Marie, Antoine; Tourbin, Mallorie; Robisson, Anne-Charlotte; Ablitzer, Carine; Frances, Christine
• Is Part Of: Ceramics international. Volume 48:Issue 6(2022)
• Page Start: 7926
• Page End: 7936
• Publication Date: 2022-03-15
• Subjects: Spray-drying -- Ultrasonic nozzle -- Two-fluid nozzle -- Alumina -- Deagglomeration -- Dispersion; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.11.340
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Spray drying produces spherical agglomerates to obtain powders with good flowability. Three alumina powders of different size and/or specific surface area were spray-dried without any binder using either two-fluid or ultrasonic nozzle technology. Compared to the two-fluid nozzle, the ultrasonic one shows a better ability to form agglomerates from a coarse powder and increases the size of the agglomerates when spray drying is carried out under the same operating conditions. The redispersion of spray-dried agglomerates in solution was analysed by applying variable ultrasound durations during size measurement by wet laser diffraction. The initial state of the powder plays a predominant role in relation to the spray drying operating conditions both in terms of size characteristics and redispersion properties. Regardless of the alumina powders and spray drying conditions, a similar trend in deagglomeration behaviour was observed with first-order kinetics and a characteristic kinetic time depending on the initial powder properties.