A numerical study of the effect of gas distribution profile across the pulp-froth interface on flotation performance

C. Bhondayi, M. H. Moys, G. Danha, Dario Fanuchi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A solution to the Laplace equation developed using a semi-analytical method termed the method of false transients was used to study the impact of the distribution of gas across the pulp-froth interface on froth performance. Simulation results indicated that profiling gas across the pulp-froth interface has a huge impact on bubble breakage across the surface of the froth and consequently results in different air recoveries. Further, gas flux distribution across the interface also resulted in changes in both bubble and particle residence time distribution. Comparison of predictions from residence time distribution and air recovery to experimental flotation performance was in partial agreement. The discrepancy between model predictions and experimental results was attributed to the fact that the current model does not take into account important froth-phase sub-processes such as bubble coalescence and froth drainage.

Original languageEnglish
Pages (from-to)22-30
Number of pages9
JournalPowder Technology
Volume286
DOIs
Publication statusPublished - Dec 1 2015

Fingerprint

Flotation
Pulp
Residence time distribution
Gases
Recovery
Laplace equation
Air
Coalescence
Drainage
Fluxes

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

Cite this

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abstract = "A solution to the Laplace equation developed using a semi-analytical method termed the method of false transients was used to study the impact of the distribution of gas across the pulp-froth interface on froth performance. Simulation results indicated that profiling gas across the pulp-froth interface has a huge impact on bubble breakage across the surface of the froth and consequently results in different air recoveries. Further, gas flux distribution across the interface also resulted in changes in both bubble and particle residence time distribution. Comparison of predictions from residence time distribution and air recovery to experimental flotation performance was in partial agreement. The discrepancy between model predictions and experimental results was attributed to the fact that the current model does not take into account important froth-phase sub-processes such as bubble coalescence and froth drainage.",
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A numerical study of the effect of gas distribution profile across the pulp-froth interface on flotation performance. / Bhondayi, C.; Moys, M. H.; Danha, G.; Fanuchi, Dario.

In: Powder Technology, Vol. 286, 01.12.2015, p. 22-30.

Research output: Contribution to journalArticle

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