Effective Processing of Low-Volatile Medium Coking Coal Fines of Indian Origin Using Different Process Variables of Flotation

Dey, Shobhana; Pani, Santosh

doi:10.1080/19392699.2012.699009

Cited by 14 publications

(3 citation statements)

References 6 publications

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“…Conventionally, the collector used in most of the Indian coal washeries is diesel oil in combination with different frothers. The dosage of collector and frother has significant effect on flotation performance (Dey and Pani 2012). Therefore, optimization of grind, collector and frother dosages was carried out followed by that of the operating parameters of flotation column.…”

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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“…The best available technique for cleaning of fine size coal with particle size <0.5mm is the froth flotation technique [3][4][5]. The coal particles subjected to treatment with suitable liquid hydrocarbon reagents to alter the hydrophobicity, and enhance recovery and /or improve selectivity [6][7], but fine particles show lower flotation rate, resulting in low flotation recovery [8]. Generally, in the coal flotation, froth can affect both the recovery and the grade, because it promotes the selective drainage of minerals back to the pulp zone [9].…”

Section: Introductionmentioning

confidence: 99%

Flotation Performance Analysis on Coal Washery Rejects 

Palthur

Sivrikaya

Pradhan³

et al. 2020

Preprint

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Coal washery rejected coals and coal slurries have better options in froth flotation as a separation process. In this study, coal slurry received from Sudamdih coal washery, Jharkhand, India, examined for cleaning through fixed cell flotation. The Petrography study of the feed sample showed the presence of vitrinite, semi vitrinite and liptinite and inertinite as major minerals. General full factorial statistical design package (Minitab V17) was used to develop the regression models for the responses like froth height, froth density, recovery and ash content of clean coal. Results showed that experimental responses like froth height, froth density, recovery and ash content were found to be more sensitive to the frother dosage. The coefficient of correlation (R2) values between the experimental and the predicted values of the flotation responses was found to be >0.98 for all the models. Further, flotation tests were conducted for varying pulp density and its effect on recovery, froth height, ash content, tests with five levels of pulp density (8, 9, 10, 11, 12 and 13%solids by weight). It found that the coal slurry sample from the study area could be cleaned with sufficient efficiency. The cleaned coal is suitable for powder coal consuming industries.

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“…Froth flotation is the most efficient and cost-effective separation method for particles within a narrow size range, normally from 50 µm to 600 µm for coal and exploits the differences in surface properties [1][2][3][4][5][6]. Froth flotation is a universally accepted physicochemical process for the beneficiation of coal fines [7].…”

Section: Introductionmentioning

confidence: 99%

Fine coal beneficiation by pilot column flotation

Vasumathi¹,

Vijayakumar²,

Prasad³

et al. 2018

J Min & Metal A Mining

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Beneficiation of coal fines with high ash content was attempted in an operating coal preparation plant by retrofitting a 0.5 m diameter pilot plant scale flotation column in the circuit. The collector and frother dosage were optimized as 0.680 kg/t and 0.058 kg/t respectively. At these reagent conditions the operating parameters of pilot scale flotation column were also optimized. The maximum yield of the froth obtained was 67.5% at the targeted ash level of 14% from a feed of 25% ash content. This was obtained at the operating parameters of 0.85 cm/s superficial air flow velocity, 0.57 cm/s superficial feed slurry velocity and 600 mm froth height. The performance of flotation column was found to be marginally better than that of the conventional flotation cells in the washery. Also, advantages such as low operational, maintenance and energy costs and operational flexibility in the case of flotation column could lead to financial accruals over a long run.

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Effective Processing of Low-Volatile Medium Coking Coal Fines of Indian Origin Using Different Process Variables of Flotation

Cited by 14 publications

References 6 publications

Beneficiation of an Indian non-coking coal by column flotation

Beneficiation of an Indian non-coking coal by column flotation

Flotation Performance Analysis on Coal Washery Rejects

Fine coal beneficiation by pilot column flotation

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Effective Processing of Low-Volatile Medium Coking Coal Fines of Indian Origin Using Different Process Variables of Flotation

Cited by 14 publications

References 6 publications

Beneficiation of an Indian non-coking coal by column flotation

Beneficiation of an Indian non-coking coal by column flotation

Flotation Performance Analysis on Coal Washery Rejects&nbsp;

Fine coal beneficiation by pilot column flotation

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Flotation Performance Analysis on Coal Washery Rejects