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The objective of the present research work was to investigate new methods for the improvement of high ash, difficult-to-wash fine coal wastes ("schlamms") in order to use the improved product as a feedstock for Coal Water Mixture ( CWM ) preparations. The efficiency of various purification processes was examined. This led to the following classification, in order of decreasing efficiency - Gravimetric processes for large particles 1 True heavy liquid cyclone 2 Fluidised bed elutriation 3 Spiral 4 Water only cyclone - Processes based on surface properties for small particles 1 Selective agglomeration 2 Flotation A combination of water only cyclone and flotation (cycloflotation) has been studied. A very good quality concentrate was obtained but further work is needed to decrease the carbon loss in the tailings. The ability of beneficiated schlamms or coals of various origins to be processed as CWMs has been assessed with standard procedures. Coal rank is the determining factor. It is possible, to some extent, to improve the CWM quality by altering the particle size distribution and optimisation of additives but the classification according to rank remains unchanged. This study leads to the definition of selection rules for the best "schlamms" regarding their beneficiation and their ability to be transformed into high concentration, fluid, and stable CWM

Additional information

Authors: DANIEL J L, Centre d'Etudes et Recherches de Charbonnages de France (FR);BRUNELLO J M, Centre d'Etudes et Recherches de Charbonnages de France (FR)
Bibliographic Reference: EUR 12809 FR (1989) 71 pp., MF, ECU 4
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