High Ash Non Coking Coal preparation by Tribo-Electrostatic Technique

Dwari, R K and Rao, K Hanumantha (2006) High Ash Non Coking Coal preparation by Tribo-Electrostatic Technique. In: Proceedings of the International Seminar on Mineral Processing Technology and Indo-Korean Workshop on Resource Recycling (MPT-2006), March 8-10, 2006, NML, Chennai.



Tribo-electrostatic method is applied to beneficiate non-coking Indian thermal coal from Ramagundam coal mines containing nearly 45% ash content. The microscopic studies revealed that quartz and kaolinite are the dominant mine-rals whereas illite, goethite, siderite and pyrite are the minor inclusions in the coal. Contact electrification of ash forming minerals and coal matter has been carried out using different tribo-charger materials of Al, Cu, brass, perspex and teflon. The Cu tribo-charger found to be opti-mum to acquire differential charge between ash-forming inorganics and coal matter. The temperature effect on the magnitude of contact charge acquisition found to be sign-ificant. Tests on a laboratory in-house built triboelectro-static free-fall separator with minus 300 microns size fraction of coal showed that the ash content can be reduc-ed from 45% to about 18% and it is feasible to obtain a clean coal as judged by the washability studies. The results illustrate that the non-coking coals can be bene-ficiated using the scientific knowledge on the response and behaviour of coal and noncoal matters to electric charges.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:http://eprints.nmlindia.org/6192
Uncontrolled Keywords:abundant fossil; agricultural sectors; non-coking coal; low sulphur
Divisions:Mineral Processing
ID Code:6192
Deposited By:Sahu A K
Deposited On:26 Nov 2012 11:56
Last Modified:26 Nov 2012 11:56
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