Effect of frothers on bubble size

Grau, Rodrigo; Laskowski, J.; Heiskanen, Kari

doi:10.1016/j.minpro.2005.01.004

Cited by 132 publications

(66 citation statements)

References 9 publications

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“…2 Grau et al 2 used a graphical method to estimate the CCC by fitting a straight line to the data in Zones I and II separately and noting there intersect as the CCC. However, more recently Nesset et al 25 suggested fitting the D 32 -C data with the following three-parameter model…”

Section: Data Fitting-ccc Modelsmentioning

confidence: 99%

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Effect of ionic strength on bubble coalescence in inorganic salt and seawater solutions

Sovechles

Waters

2015

AIChE Journal

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Bubble size is of fundamental importance in the flotation process, as it provides the surface area for particle collection. Typically, weak surfactants (frothers) are added to process water to reduce bubble coalescence. Certain inorganic electrolytes, which occur naturally in some flotation process water, have been shown to mimic the role of frothers. The concentration at which bubble coalescence is inhibited, the critical coalescence concentration, was determined in a 5.5-L mechanical flotation cell for a series of coalescence inhibiting inorganic salts. To mimic some industrial flotation process water, a synthetic sea salt solution was also tested. It was found that when the multicomponent sea salt solution was broken down into its constituent parts, the addition of the ionic strength of each ion correlated well with the overall ionic strength curve of all the salts tested. The critical coalescence ionic strength ranged from 0.22 to 0.35, with sea salt being 0.26.

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Section: Data Fitting-ccc Modelsmentioning

confidence: 99%

“…The slope of the curve in Zone I is dependent upon the solutes ability to prevent coalescence, while the value of the limiting bubble size, d l , is considered a property of the bubble break-up mechanics. 2 The point at which the fitted curves for Zones I and II meet defines the CCC.…”

Section: Introductionmentioning

confidence: 99%

Effect of ionic strength on bubble coalescence in inorganic salt and seawater solutions

Sovechles

Waters

2015

AIChE Journal

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“…Grau et al [12] suggested CCC is a material constant; i.e., is unique for a given frother. Nesset et al [2,13] explored the dependence of CCC95 on operating variables, for example showing it was independent of impeller speed but increased with air rate.…”

Section: Critical Coalescence Concentration and Hydrophile-lipophile mentioning

confidence: 99%

Characterizing Frothers through Critical Coalescence Concentration (CCC)95-Hydrophile-Lipophile Balance (HLB) Relationship

Zhang

Nesset²,

Rao

et al. 2012

Minerals

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Frothers are surfactants commonly used to reduce bubble size in mineral flotation. This paper describes a methodology to characterize frothers by relating impact on bubble size reduction represented by CCC (critical coalescence concentration) to frother structure represented by HLB (hydrophile-lipophile balance). Thirty-six surfactants were tested from three frother families: Aliphatic Alcohols, Polypropylene Glycol Alkyl Ethers and Polypropylene Glycols, covering a range in alkyl groups (represented by n, the number of carbon atoms) and number of Propylene Oxide groups (represented by m). The Sauter mean size (D 32 ) was derived from bubble size distribution measured in a 0.8 m 3 mechanical flotation cell. The D 32 vs. concentration data were fitted to a 3-parameter model to determine CCC95, the concentration giving 95% reduction in bubble size compared to water only. It was shown that each family exhibits a unique CCC95-HLB relationship dependent on n and m. Empirical models were developed to predict CCC95 either from HLB or directly from n and m. Commercial frothers of known family were shown to fit the relationships. Use of the model to predict D 32 is illustrated.

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“…The effect of the reagent dosage (collector and frother) on the flotation performance of column flotation is almost similar to that observed in mechanical cells. In other words, it has been mentioned that the reagent dosage has an optimum value in flotation and at that value the recovery reaches the maximum (Cho and Laskowski, 2002;Flint et al, 1988;Grau et al, 2005;Tuteja et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Optimization of some parameters in column flotation and a comparison of conventional cell and column cell in terms of flotation performance

Hacıfazlıoğlu

Sütçü

2007

Journal of the Chinese Institute of Chemical Engineers

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Effect of frothers on bubble size

Cited by 132 publications

References 9 publications

Effect of ionic strength on bubble coalescence in inorganic salt and seawater solutions

Effect of ionic strength on bubble coalescence in inorganic salt and seawater solutions

Characterizing Frothers through Critical Coalescence Concentration (CCC)95-Hydrophile-Lipophile Balance (HLB) Relationship

Optimization of some parameters in column flotation and a comparison of conventional cell and column cell in terms of flotation performance

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