- Title
- Influence of additives on gas holdup and bubble size
- Creator
- Bournival, Ghislain; Jameson, Graeme; Ata, Seher
- Relation
- International Mineral Processing Congress (IMPC 2014). IMPC2014: Online Proceedings (Santiago, Chile 20-24 October, 2014)
- Relation
- http://www.gecaminpublications.com/impc2014
- Publisher
- Gecamin Digital Publications
- Resource Type
- conference paper
- Date
- 2014
- Description
- A common method to prevent bubbles from coalescing in a flotation cell is by the addition of surfactants, called frothers. The gas dispersion properties in a column were tested for solutions of 1-pentanol, tri(propylene glycol) methyl ether, and poly(propylene glycol) in the presence of sodium chloride. The dependency of surfactant on the gas holdup can be divided into regions. It seemed that for a sufficiently low concentration of surfactant, even a stronger surfactant could show a transition in gas holdup from constant/decreasing to increasing with concentration. This region, however, was not marked by a decrease in the average bubble size. In addition, PPG gave higher gas holdup values while averaging larger bubbles. On the other hand, sodium chloride mostly affected the gas holdup when the concentration was high enough to prevent bubble coalescence. Another parameter affecting the gas holdup was the superficial gas velocity. A linear dependency was found between the two under a bubbly flow regime. The current study showed that both surfactants and salt could slightly affect the influence of the superficial gas velocity on the gas holdup.
- Subject
- flotation fundamentals; gas and bubbles; flotation cells
- Identifier
- http://hdl.handle.net/1959.13/1322342
- Identifier
- uon:24564
- Language
- eng
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