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Article Dans Une Revue Ceramics International Année : 2022

Wet size measurements for the evaluation of the deagglomeration behaviour of spray-dried alumina powders in suspension

Résumé

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.
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Dates et versions

hal-03766545 , version 1 (27-10-2023)

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Antoine Marie, Mallorie Tourbin, Anne-Charlotte Robisson, Carine Ablitzer, Christine Frances. Wet size measurements for the evaluation of the deagglomeration behaviour of spray-dried alumina powders in suspension. Ceramics International, 2022, 48 (6), pp.7926-7936. ⟨10.1016/j.ceramint.2021.11.340⟩. ⟨hal-03766545⟩
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