Washability is the ease of washing coal. Generally washability curves are used to determine washability characteristics of given coal samples.
The coal processing methods used at the Zarand coal washery plant are the heavy medium bath, jigs, and flotation. The coal-containing materials that are fed to the plant are acquired from different mines, and they have different washability properties. In this paper, the validity of Mayer curve (M-curve), the conventional method for determining coal washability, was evaluated on blending of raw coals that are fed to the plant. Washability curves were prepared for the hand-blended samples and compared with the washability predicted by the Mayer curves. Different samples from different seams and mines were blended by hand in 50:50 ratios, and sink and float tests were performed; the resulting washability curves were in good agreement with the washability curves predicted using the Mayer method for the same blending ratio. This work resulted in the preparation of the optimum plant feed that can be achieved from the blending of different coal samples to produce the best plant yield at a given ash content.http://www.sciencedirect.com/science/article/pii/S2095268612000146
This paper summarizes the washability study conducted under the Coal Quality project. The aim of the study was to investigate and interpret washability characteristic of British Columbia coals, in order to provide a geological basis of washability and to gain practical information which will be useful in the processing and utilization of these coals Washability characteristics of many coal seams from various British Columbia coalfields were examined. http://passthrough.fw-notify.net/download/372677/http://www.empr.gov.bc.ca/Mining/Geoscience/PublicationsCatalogue/Papers/Documents/Paper1994-2.pdf
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