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Producing hollow granules from hydrophobic powders in high-shear mixer granulators

Eshtiaghi, Nicky, Arhatari, Benedicta and Hapgood, Karen P. 2009, Producing hollow granules from hydrophobic powders in high-shear mixer granulators, Advanced powder technology, vol. 20, no. 6, pp. 558-566, doi: 10.1016/j.apt.2009.08.006.

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Title Producing hollow granules from hydrophobic powders in high-shear mixer granulators
Author(s) Eshtiaghi, Nicky
Arhatari, Benedicta
Hapgood, Karen P.
Journal name Advanced powder technology
Volume number 20
Issue number 6
Start page 558
End page 566
Total pages 9
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2009-11
ISSN 0921-8831
Keyword(s) hollow granule
liquid marbles
dry water
Summary The formation of hollow granules from hydrophobic powders in a high-shear mixer granulator has been investigated by changing the binder/powder mass ratio and studying its effects on granule size and structure. In this study, a mixer granulator was filled with 100 g of hydrophobic fumed silica and then varying quantities of 5% Hydroxy Propyl Cellulose solution was slowly sprayed into granulator. A range of liquid to solid mass ratios between from 0.5:1 to 15:1 was used. Granules were then dried at 60 °C in a fan forced oven. This paper compares the particle size distributions, scanning electron microscopy (SEM) images and X-ray tomography (XRT) images of hollow granules as a function of the liquid to solid mass ratio. The granule mean size increased and the fraction of un-granulated (fine) particles decreased as the liquid to solid mass ratio increased. Simultaneously, the morphology and structure of the hollow granules changed from a spherical to a deformed structure which indicates the importance of choosing the optimal liquid to solid mass ratio. The optimal liquid to solid mass ratio for Aerosil R202 powder in this study was found to be between 3:1 and 6:1. The final granule shape and size distribution are dependent on the liquid to solid ratio if the liquid marble nucleation process starts with a preformed droplet template.
Notes The article states that it is jointly published by Elsevier & The Society of Powder Technology Japan.
Language eng
DOI 10.1016/j.apt.2009.08.006
Field of Research 0904 Chemical Engineering
0913 Mechanical Engineering
Socio Economic Objective 0 Not Applicable
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2009, The Society of Powder Technology Japan
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Collection: School of Engineering
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