Dry beneficiation of coal

Lockhart, N.C.

doi:10.1016/0032-5910(84)85053-6

Cited by 80 publications

(31 citation statements)

References 13 publications

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“…The dry coal beneficiation method can serve as an alternative to the wet coal cleaning processes, which is very important for coal producing countries where fresh water is scarce. Dry beneficiation of fine coal can be economically competitive because energy need not be expended in drying the fine coal, which is mainly used as fuel (Lockhart, 1984). In addition, dry beneficiation will also serve as a potential technique for recovering and utilising coals that would have otherwise been classified unrecoverable because of environmental or economic constraints (Bada et al, 2010).…”

Section: Novel Dry Ash Beneficiation Processes For Managing Unburned mentioning

confidence: 99%

“…After triboelectrification, the particles entering into the electric field get attracted towards a positive or negative electrode plate according to their charge polarity and magnitude. Several studies have shown that clean coal generally charges positively and ash forming minerals or high ash coals charge negatively (Carta et al, 1976;Lockhart, 1984;Alfano et al, 1988;Tao et al, 2008). Source: Tao et al (2011) The rotary triboelectrostatic separation (RTS) system shown in Figure 8 includes a vibratory sample feeder, a rotary charger or charge exchanger, a separation chamber, an injection gas unit and two high-voltage DC supplies.…”

Section: Triboelectrostatic Separationmentioning

confidence: 99%

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A review on improvement of coal-fired power plants and environmental benefits of ash utilisation

Samanli

Çelik

Oney

et al. 2017

IJGW

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Electricity generation in coal fired power plants produces large amount of residues. These materials are known as coal combustion products (CCPs) and can release pollutants to the environment. However, CCPs are environmentally and technically suitable for uses in many areas. The utilisation of CCPs in these areas helps to reduce the overall harmful effects of coal combustion for electricity generation by stabilising the environmentally toxic pollutants. The current paper reveals the possible usage areas of improved ash and presents the general approaches have been developed to obtain improved fly ash. Electrostatic separator with tribocharging technique has great potential for utilisation of coal ash. It significantly contributes to reduce fly ash disposal problems. In recent years, triboelectrostatic separators have increased significantly for the feasibility and success of the implementation of electrostatic separation. Studies carried out by various researchers on triboelectrostatic separation for utilisation of fly ash were also compiled in this article.

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Section: Novel Dry Ash Beneficiation Processes For Managing Unburned mentioning

confidence: 99%

Section: Triboelectrostatic Separationmentioning

confidence: 99%

A review on improvement of coal-fired power plants and environmental benefits of ash utilisation

Samanli

Çelik

Oney

et al. 2017

IJGW

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“…The specific merits and problems of dry coal preparation compared to conventional wet preparation have been discussed in earlier work [2,3,[14][15][16][17]. One of the main problems of conventional dry processes, which rely on pneumatic mechanical cleaning, is the lower separation efficiency and inability to concentrate the fines.…”

Section: Dry Coal Preparationmentioning

confidence: 99%

Electromagnetic De‐Shaling of Coal

Jong

Mesina

Kuilman

2003

Physical Separation in Science and Engineering

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The efficiency with which an electromagnetic sensor array is able to distinguish density and ash content of coal and shale mixtures was determined experimentally. The investigated sensor was originally designed for automatic metal detection and sorting in industrial glass recycle processing, where it is widely applied. In coal preparation, the results indicate good possibilities to remove automatically the remaining shale from the coal product, or to recover the remaining coal from the waste rock. Compared to alternative methods, the system has advantages of simple construction, insensitivity to fluctuating dust or moisture levels and a proven industrial reference. Applications can be either sorting of lump-sized coal or coal separation in the 10-50 mm size range in a dry preparation process.

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“…The advent of efficient wet processing units and demand for higher-quality minerals facilitated the decline. However, scarcity of water, downstream process water decontamination issues, and stricter environmental regulations concerning effluent discharge augmented by increasing capital expenditure on treating slurry impoundments have resulted in a significant increase in industry interest in effective dry cleaning solutions [2][3][4][5][6]. Dry cleaning is making a strong comeback in the twenty-first century.…”

Section: Introductionmentioning

confidence: 99%

Scale and Numerical Modeling of an Air-Based Density Separator

Ghosh

Rezaee

Honaker

et al. 2014

Progress in Scale Modeling, Volume II

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The development of an air-based density separator for effectively treating finer-size fraction (6 mm Â 1 mm) of run-of-mine coal is essential for the industry. Based on the derived scaling laws, the full-scale model of a laboratory air-based density separator and a prototype model scaled down by the factor of ½ in the X, Y, and Z directions were simulated using numerical methods. The air velocity contour plots, vector plots, and turbulent intensity values were used to validate the scaling laws. The absolute percent difference of air velocity between the two models was 3.83 %. In addition to this finding, the air velocity contour and vector plot and the turbulent intensity contours in two models showed modest variation, thereby indicating the validity of the scaling laws. The publication details the development of the full-scale and the prototype numerical models and the correlation of the derived scaling laws with the numerical and the experimental results.

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Dry beneficiation of coal

Cited by 80 publications

References 13 publications

A review on improvement of coal-fired power plants and environmental benefits of ash utilisation

A review on improvement of coal-fired power plants and environmental benefits of ash utilisation

Electromagnetic De‐Shaling of Coal

Scale and Numerical Modeling of an Air-Based Density Separator

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