Journal
INTERNATIONAL JOURNAL OF MINERAL PROCESSING
Volume 94, Issue 3-4, Pages 115-120Publisher
ELSEVIER
DOI: 10.1016/j.minpro.2010.01.003
Keywords
Bubble shape; Bubble rise velocity; Frothers
Funding
- Chilean Government
- Universidad de Chile
- Vale Inc
- Teck Cominco
- Xstrata
- Agnico-Eagle
- Barrick Gold
- Shell Canada
- SGS Lakefield
- COREM
- Flottec through the NSERC (Natural Science and Engineering Research Council of Canada
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The effect of frother and NaCl salt on the shape and velocity of a ca. 2.4 mm diameter bubble close to the generation point at an orifice was studied using high-speed imaging. Bubbles accelerate to reach a maximum velocity at a given time depending on frother type and concentration, followed by deceleration and then oscillation about a mean velocity. A relationship between bubble shape and velocity is observed: the more spherical the bubble, the slower the rise, which is in agreement with recent literature. The findings support the argument that surfactants may affect bubble rise velocity through control of bubble shape. (C) 2010 Elsevier B.V. All rights reserved.
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