Effect of flotation frothers on bubble size and foam stability

Cho, Y.S; Laskowski, J.

doi:10.1016/s0301-7516(01)00064-3

Cited by 355 publications

(187 citation statements)

References 39 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%

“…This action is usually ascribed to frothers acting to reduce coalescence [9]. Combining these points Cho and Laskowski [10] introduced the term critical coalescence concentration (CCC) to describe the minimum concentration giving the minimum bubble size. Laskowski [11] showed that all frothers produced a similar D 32 -C trend, differing only in their CCC, for example DowFroth 250 with CCC 9.1 ppm and MIBC 11.2 ppm.…”

Section: Critical Coalescence Concentration and Hydrophile-lipophilementioning

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: Critical Coalescence Concentration and Hydrophile-lipophilementioning

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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“…15 m/s) line by determining the 95% confidence interval of the line [1]. This graphical method is similar to that used in determining the critical micelle concentration (CMC) from a surface tension-concentration plot [23] and the critical coalescence concentration (CCC) from a bubble size-concentration plot [4,18]. A more practical approach is to use a formula, which allows one to rapidly and accurately determine the CMV of frothers.…”

Section: Terminal Bubble Velocitymentioning

confidence: 99%

“…This influence has to be experimentally determined in terms of the most efficient range of concentrations, where desired liquid/gas interface properties, triggering useful frothers' features and allowing their classification, can be achieved. The experimentally determined parameters, which are commonly used for these purposes, are for example, the concentration at the minimum bubble velocity (CMV) [1][2][3], the critical coalescence concentration (CCC) [4][5][6], the concentration at half of the maximum foam height (CMH) [7] or the dynamic frothability index (DFI) [8][9][10]. Since all these parameters depend mainly on the properties of the liquid/gas interface, the corresponding characteristic frother concentration values can vary strongly, depending on the frother's family (type) and carbon chain length.…”

Section: Introductionmentioning

confidence: 99%

Concentration at the Minimum Bubble Velocity (CMV) for Various Types of Flotation Frothers

2017

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This paper presents the determination of a concentration at the minimum bubble velocity (CMV) for different types of frothers, such as straight and branched alkyl chain aliphatic alcohols, 1,ω-diols, poly(propylene glycol) and poly(ethylene glycol) alkyl ethers, n-alkyltrimethylammonium bromides, commercial frothers and others. The values of terminal rise bubble velocity were reviewed from the experimental data published in the literature for two different types of columns, i.e., a short PAS (used in Polish Academy of Sciences) of height (35 cm) and a long McGill of height (350 cm). The obtained empirical equation is universal and allows one to rapidly and accurately determine the CMV for all surfactants. The proposed empirical model can also be used to predict the terminal bubble velocity-frother concentration curve by knowing the maximum and minimum terminal velocities, as well as the values of CMV. Assessment and usefulness of frother characterization parameters (i.e., concentration at the minimum bubble velocity (CMV), dynamic frothability index (DFI) and critical coalescence concentration (CCC)) were shown in the flotation of coal.

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“…Controlling gas flow rate (if possible) 2. Optimize frother consumption by ensuring that the plant never operates above the critical coalescence concentration, or CCC, (Cho and Laskowski, 2002) for the given plant conditions.…”

Section: Process Control Strategiesmentioning

confidence: 99%

The Online Determination of Bubble Surface Area Flux Using the CiDRA GH-100 Sonar Gas Holdup Meter

Amelunxen¹,

Rothman²

2009

IFAC Proceedings Volumes

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Abstract:In recent years it has been well documented that the bubble surface area flux plays a fundamental role in the performance of industrial flotation machines. Modern instrumentation is not yet capable of providing a robust direct measurement of this parameter, and the widespread industrial use of the available indirect methods have been hampered by the limitations of the available instruments and the complexity of the required calculations. This paper describes a reliable and maintenance-free method for online inference of bubble diameter and bubble surface area flux using CiDRA's GH-100 gas holdup meter. A method is presented for coding the iterative drift-flux analysis calculations for column cell bubble diameter and surface area flux using standard expert system or DCS programming language. An alternative empirical method applicable to mechanical cells is also demonstrated. Operating data from an industrial plant historian is presented.

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Effect of flotation frothers on bubble size and foam stability

Cited by 355 publications

References 39 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

Concentration at the Minimum Bubble Velocity (CMV) for Various Types of Flotation Frothers

The Online Determination of Bubble Surface Area Flux Using the CiDRA GH-100 Sonar Gas Holdup Meter

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