Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Experiment on Adhesion and Removal of Suspended Particle in Liuuid by Bubble
Investigation on Removal Rate Constant at Initial Stage
Hirotada ARAIShuya NAKAMURAAtsushi OKAYAMAKatsutoshi MATSUMOTOShoji TANIGUCHI
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2006 Volume 92 Issue 10 Pages 584-590

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Abstract

It is widely recognized that inclusions in steel cause defects to the products. Therefore, it is important to remove inclusions from liquid steel. The attachment and removal by bubble flotation is expected as one of promising techniques for inclusion removal in liquid steel. The process of particle removal by bubbles is influenced by various factors, including the liquid flow, particle diameter, bubble size. The present work is intended to investigate experimentally the effects of some factors such as particle diameter, gas flow rate and agitation speed to particle removal rate. In this study, water model experiments on bubble flotation have been done under turbulent flow condition using a mechanically agitated vessel. It was confirmed that the change in particle concentration of suspended liquid with time shows first order kinetics until 4 minutes in the initial stage. Furthermore, it was found that the particle removal rate has increased with increasing particle diameter, gas flow rate and agitation speed.

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