Novel fluidised-bed tribo-electrostatic separator for dry coal preparation
2008 (English)In: Conference in Minerals Engineering 2008, Luleå: Luleå tekniska universitet, 2008, 15-29 p.Conference paper (Other academic)
Dry coal beneficiation has been examined by tribo-electrostatic method using Indian thermal coal sample from Ramagundam coal mines. The process of triboelectric coal/ash cleaning is carried out with a newly built cylindrical fluidised-bed tribocharger with internal baffles, all made up of copper metal. The charge transfer of coal maceral and mineral particles upon contacts with copper plate of tribocharger is measured. Separation of particles in an electrostatic separator according to the polarity of particle charge is discussed with respect to gas flow rate and residence time in fluidised-bed trobo-charger and the applied electric field. The coal and mineral particles charge with positive and negative polarities respectively. The magnitude of particles charge found to be relatively high illustrating greater efficiency of contact electrification in fluidised bed tribo-charger. The separation results with minus 300 μm size fraction of coal containing 43% ash showed that the ash content is reduced to 18% and 33% with an yield of about 30% and 67%, respectively. These results are comparable to the maximum separation efficiency curve of washability studies on this coal sample. Since the ash percentage of coal particles collected in the bins close to positive and negative electrodes are about 70% and 20%, a better yield with low ash content can be accomplished on recycling the material.
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 2008. 15-29 p.
Technical report / Luleå University of Technology, ISSN 1402-1536 ; 2008:03
Research subject Mineral Processing
IdentifiersURN: urn:nbn:se:ltu:diva-31621Local ID: 5dd4d400-fcc8-11dc-a946-000ea68e967bOAI: oai:DiVA.org:ltu-31621DiVA: diva2:1004855
Konferens i mineralteknik 2008 : 05/02/2008 - 06/02/2008
Godkänd; 2008; 20080328 (ysko)2016-09-302016-09-30Bibliographically approved