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Washability study. coal extraction and processing is a mineral removal and refinement process in which coal ( black or brownish- black sedimentary rock composed mostly of carbon and hydrocarbons that contain energy that is released when burned) is removed from the earth and treated for pdf further use. through coal preparation, a uniform pdf product is achieved. coal preparation is the removal of undesirable material from the run- of- mine ( rom) coal by employing coal processing steps pdf separation processes which are able to differentiate between the physical and surface properties of the coal and the impurities. describing and eliminating the health hazards of coal processing requires an understanding of the nature of the raw materials, products, by- products, the steps type of pollutants produced, the design of the plant and its operating methods ( wadden, 1976 ). the scheme used in physical coal cleaning processes varies among coal cleaning plants but can generally be divided steps into four basic phases: initial preparation, fine coal processing, coarse coal processing, and final preparation.
the elements of a surface mining operation are ( 1) topsoil removal and storage for later use, ( 2) drilling and blasting the strata overlying the coal seam, ( 3) loading and transporting this fragmented overburden material ( called spoil), ( 4) drilling and blasting the coal seam, ( 5) loading and transporting the coal, ( 6) backfilling with spoil and. a process flow diagram for a typical coal cleaning plant is presented in figure 11.
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