The effect of ultrasound on solid-liquid mass transfer in an agitated ion exchange system

Stoian, D, Parthasarathy, R, Eshtiaghi, N and Wu, J 2014, 'The effect of ultrasound on solid-liquid mass transfer in an agitated ion exchange system', in Kevin Stevenson (ed.) Proceedings of Chemeca 14 - Processing Excellence; Powering Our Future, Perth, Australia, 28 September- 01 October 2014, pp. 1-10.


Document type: Conference Paper
Collection: Conference Papers

Title The effect of ultrasound on solid-liquid mass transfer in an agitated ion exchange system
Author(s) Stoian, D
Parthasarathy, R
Eshtiaghi, N
Wu, J
Year 2014
Conference name Chemeca 14 - Processing Excellence; Powering Our Future
Conference location Perth, Australia
Conference dates 28 September- 01 October 2014
Proceedings title Proceedings of Chemeca 14 - Processing Excellence; Powering Our Future
Editor(s) Kevin Stevenson
Publisher Engineers Australia
Place of publication Barton, Australia
Start page 1
End page 10
Total pages 10
Abstract Enhancing solid-liquid mass transfer plays a vital role to promote the efficiency of leaching operations in the mineral industry. It has been shown that interphase mass transfer can be enhanced with the application of cavitation using ultrasound. However, these studies made no attempt to investigate ultrasonically enhanced mass transfer at critical impeller speed in solid-liquid agitated vessels. This study aims to investigate the effects of ultrasound on solid-liquid mass transfer coefficient kSL while operating the agitator at just off-bottom solid suspension (NJS) speed under both baffled and unbaffled conditions. Experiments were carried out in a 0.2 m diameter, cylindrical, flat bottom agitated vessel equipped with a 6-bladed Rushton turbine and an ultrasound generation device. The solid and liquid phases used in this study were cation exchange resin and aqueous NaOH, respectively. Experimental results suggest that kSL under combined agitation and ultrasonic irradiation are about 10% higher than those for just agitation under both baffled and unbaffled conditions and its effects are greatest at lower solid concentrations. The kSL value is lower under unbaffled conditions and ultrasonic intensity has no effect on kSL regardless of whether baffles are present or not. These results imply that the use of cavitation can increase kSL whilst operating the stirred vessel at NJS.
Subjects Rheology
Keyword(s) Solid-liquid mass transfer
Agitated vessel
Solid suspension
Cavitation
Ultrasound
ISBN 9781922107381
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