Gas dispersion measurements in flotation cells

Gómez, C.O.; Finch, J.A.

doi:10.1016/j.minpro.2007.03.009

Cited by 106 publications

(48 citation statements)

References 2 publications

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“…The observation also raises a fundamental question. The CCC concept implies frother is involved only in preserving the bubble size produced by the machine; i.e., the machine produces, frother preserves hypothesis [10,35]. This argument means that D L is the machine-produced Sauter mean size and might be expected to be invariant for given machine operating conditions but Figure 13 argues that frothers play some role in the initial bubble creation size.…”

Section: Discussionmentioning

confidence: 99%

“…Air supply was from a compressed air system and manipulated via a 400 LPM KMS TM mass flow meter. Bubble sizing employed the McGill Bubble Size Analyzer (MBSA), a sampling-for-imaging technique [22,23]. The sampling tube of the MBSA was positioned 33 cm from the central shaft (19 cm from the wall) and 52 cm from the bottom of the tank (20 cm below the water surface).…”

Section: Apparatusmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 99%

Section: Apparatusmentioning

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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“…Inside the chamber, bubbles contacted the inclined (158) window and dispersed into a near monolayer. 20 Images of the bubbles sliding up the inclined window were taken using a Canon EOS 60D camera (equipped with a Canon EF 100 mm 1:1.28 USM macrolens) at a rate of 0.5-1 frames per second (depending on bubble rise velocity). These images were then analyzed offline to enable a large number of bubbles, recommended to be greater than 5000 by Hernandez-Aguilar et al, 21 to be counted and give statistically robust results.…”

Section: Apparatusmentioning

confidence: 99%

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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“…For cells provided with gas flowrate sensors it can be implemented without capital investment. In their absence, as was the case at Brunswick Mine, use was made of a gas velocity sensor [24]. For self-aspirated cells air rate can still be controlled this time by manipulating froth depth.…”

Section: Discussionmentioning

confidence: 99%

An Overview of Optimizing Strategies for Flotation Banks

2012

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Abstract:A flotation bank is a serial arrangement of cells. How to optimally operate a bank remains a challenge. This article reviews three reported strategies: air profiling, mass-pull (froth velocity) profiling and Peak Air Recovery (PAR) profiling. These are all ways of manipulating the recovery profile down a bank, which may be the property being exploited. Mathematical analysis has shown that a flat cell-by-cell recovery profile maximizes the separation of two floatable minerals for a given target bank recovery when the relative floatability is constant down the bank. Available bank survey data are analyzed with respect to recovery profiling. Possible variations on recovery profile to minimize entrainment are discussed.

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Gas dispersion measurements in flotation cells

Cited by 106 publications

References 2 publications

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

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

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

An Overview of Optimizing Strategies for Flotation Banks

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