The Effect of Mechanical Variables on the Flotation of Coarse Coal

Bensley, C.N; Nicol, S.K.

doi:10.1080/07349348508945548

Cited by 17 publications

(12 citation statements)

References 5 publications

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“…Fine coal processing has always been a problematic and costlier than the cleaning of coarse coal (Andrew Mohns 1997). Froth flotation technique is an effective and best available technique for cleaning fine coal with particle size less than approximately 0.5 mm (Bensley and Nicol 1985;Yoon et al 2002;Koca et al 2010). Froth flotation, which exploits the difference in surface properties of minerals, is recognized as an efficient method for coal cleaning and processing of minerals.…”

Section: Resultsmentioning

confidence: 99%

Beneficiation of an Indian non-coking coal by column flotation

Vasumathi

Kumar

Ratchambigai

et al. 2016

Int J Coal Sci Technol

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Beneficiation of non-coking coal is gaining ground in India. It not only reduces the volume of inert content to be transported to the power plant and also lowers the wear in the boiler houses. For special applications such as the fuel for integrated gasification combined cycle plant (IGCC), the ash content in the coal should preferably be below 15 %. Indian coals are characterized by high inter-grown ash content mainly due to 'drift origin' of Gondwana formation in Permian age. This warrants fine grinding of non-coking coal in order to liberate the ash forming minerals from coal macerals. A noncoking coal sample of vitrinite type from India was ground to 44 lm (d 80 ) and subjected to column flotation to improve its quality. The non-coking coal analyzing 34.6 % ash, 26.2 % volatile matter, 1.3 % moisture and 37.9 % fixed carbon could be upgraded to a concentrate/froth of 14.83 % ash at 72.18 % yield by optimizing collector and frother dosages and flotation column operating parameters, namely, froth depth, superficial feed velocity and superficial air velocity. The concentrate produced by this process is suitable as fuel for IGCC in coal-to-electricity route.

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Section: Resultsmentioning

confidence: 99%

Beneficiation of an Indian non-coking coal by column flotation

Vasumathi

Kumar

Ratchambigai

et al. 2016

Int J Coal Sci Technol

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“…We will comment on this model by comparison with the developments proposed in this work. The first set of experiments is due to Bensley et al [1] and concerns the flotation of fine coal particles. They reported experimental data representing the variation of the flotation recovery as a function of the height of the collection zone in the flotation column.…”

Section: Application Of the Kinetic Model To Flotation Column Modelingmentioning

confidence: 99%

“…This model, developed to describe flotation in a bubble column, is interpreted with regard to the effect of the superficial saturation of the bubbles on the kinetics of flotation. simulations obtained under different hypotheses of simplification are compared to experimental data in the literature, Bensley et al [1] and Yachausti et al [2]. For these experimental data, the classical first-order models are insufficient to represent the flotation kinetics.…”

Section: Introductionmentioning

confidence: 99%

“…In their common formulation, the kinetic models applied to the flotation process are first order and the constant of flotation kinetics is determined by maintaining all the parameters constant while varying the flotation time [1,2]. This kind of model may be validated on the basis of experimental analysis provided that the first-order behavior is supported by the experimental data, as in the work of Ahmed and Jameson [5] for example.…”

Section: Introductionmentioning

confidence: 99%

“…For long contact time, this difference vanishes: the mass transfer is stopped when the concentration of saturation in the liquid is reached. In fact, in some flotation devises, for a given flux of bubbles, the recovery of particles may still be constant at a relatively low value whatever the height of the flotation column [1].…”

Section: Introductionmentioning

confidence: 99%

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Gas‐Liquid Mass Transfer Approach applied to the Modeling of Flotation in a Bubble Column

Chahed

M'Rabet

2008

Chem Eng & Technol

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A kinetic model developed to describe flotation in a bubble column is presented. This model, developed on the basis of the theory of mass transfer in gas-liquid flows, makes explicit in its formulation the effect of the superficial saturation of bubbles on the kinetics of flotation. The model is applied to the simulation of flotation column experiments for which the classical first-order models, commonly used in flotation modeling, are insufficient to represent the flotation kinetics. The results of the simulations obtained under different hypotheses of simplification and compared to experimental data show that the model succeeds in representing the flotation kinetics in these cases.

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Flotation of coarse particles in a counter-current column cell

Soto

Barbery

1991

Mining, Metallurgy & Exploration

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The Effect of Mechanical Variables on the Flotation of Coarse Coal

Cited by 17 publications

References 5 publications

Beneficiation of an Indian non-coking coal by column flotation

Beneficiation of an Indian non-coking coal by column flotation

Gas‐Liquid Mass Transfer Approach applied to the Modeling of Flotation in a Bubble Column

Flotation of coarse particles in a counter-current column cell

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