An exponential decay relationship between micro-flotation rate and back-calculated induction time for potential flow and mobile bubble surface

Min, Maung A. and Nguyen, Anh V. (2013) An exponential decay relationship between micro-flotation rate and back-calculated induction time for potential flow and mobile bubble surface. Minerals Engineering, 40 67-80. doi:10.1016/j.mineng.2012.09.017


Author Min, Maung A.
Nguyen, Anh V.
Title An exponential decay relationship between micro-flotation rate and back-calculated induction time for potential flow and mobile bubble surface
Journal name Minerals Engineering   Check publisher's open access policy
ISSN 0892-6875
1872-9444
Publication date 2013-01-01
Year available 2012
Sub-type Article (original research)
DOI 10.1016/j.mineng.2012.09.017
Volume 40
Start page 67
End page 80
Total pages 14
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Language eng
Abstract Flotation researchers have long hypothesised that particles have inherently different flotation rates under the same operating conditions because they have different induction times in the flotation cell. The relationship between flotation rate constant and induction time, however, has yet to be explored. Here we analysed the relationship between micro-flotation rate and back-calculated induction time for galena and sphalerite particles. The floatability of the particles was controlled by depression with potassium chromate (galena) and activation with copper sulphate (sphalerite). The bubble rise velocity vs. size in the micro-flotation experiments was determined by high speed video microscopy and followed the prediction for bubbles with the fully mobile air-water interface. Therefore, the theoretical analysis of the micro-flotation results was carried out, based on the potential flow model for water flow around a mobile bubble surface. The relationship between micro-flotation rate constant and back-calculated induction time was found to rapidly decay exponentially. In this model, flotation rate constant is highly sensitive to induction time. For example, a doubling or tripling of induction time results in an order-of-magnitude decrease in flotation rate constant.
Keyword Flotation kinetics
Collision
Attachment
Detachment
Galena Sphalcrite
Sphalerite
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online: 9 November 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Julius Kruttschnitt Mineral Research Centre Publications
School of Chemical Engineering Publications
Official 2014 Collection
 
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