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The objective of the investigation was to improve a process of coal purification by flotation and/or electrostatic separation in order to obtain a concentrate with a very low ash and pyrite content. Different types of coal were studied: oxidised coal coming from waste-heaps, coal with volatile content and anthracitic as well as pyritic coals. For this last type of coal, it appeared that the techniques used could not be considered except in the case of relatively coarser pyrite; the complete elimination of pyrite in the form of very fine grains is impossible, given the non-liberation of most of them. Flotation proved to be the most appropriate technique for the fixed objective; the reagents used (triisoctylamine with or without fuel oil as collector, Aerofroth 71 as frothing agent) are particularly well adapted to the flotation of coal. The electrostatic separation technique appears to be less effective for the production of ultra-pure coal - the ash content of the concentrates obtained remains very important and the yield by weight quite low. Its use should, therefore, be reserved for cleaning.

Additional information

Authors: SERVICE EXPLOITATION DES MINES ET DE PREPARATION DES MINERAIS ET CHARBONS, Université Libre de Bruxelles, Faculté des Sciences Appliquées (BE)
Bibliographic Reference: EUR 14134 FR (1992) 334 pp., MF, ECU 12, blow-up copy ECU 33
Availability: (2)
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