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14 <br />UNDERGROUND COAL WASTE DISPOSAL SYSTEM • <br />CONCEPTUAL DESIGN <br />Introduction 1 <br />The underground coal waste disposal system can be divided <br />into two subsystems: <br />• Above 'ground system <br />• Below ground system. <br />The above ground system is responsible for material sizing, <br />slurry formation and slurry pumping. The below ground system <br />transports, dewaters and pneumatically stores the waste material. <br />The above ground system must fit into the existing wash <br />plant with minimal changes and permit continuous material <br />handling and storage during emergency situations. The underground <br />system must fit into the existing mine and mine plan, be flexible <br />enough to permit movement of the dewatering/pneumatic feeding <br />station, and not interfere with the present mining methods. <br />Overall Conceptual Design • <br />The underground waste disposal system's overall conceptual <br />design is illustrated in Figure 2. Refuse separated from clean <br />coal in the Baum Jig is removed by draining bucket elevators <br />and directed by means of a flop gate to either a double-deck- <br />dewatering screen or refuse crusher. <br />The double-deck screen will be utilized only during a <br />stopage in coarse slurry transport. The oversize from both <br />cloths discharges into a 100 ton capacity emergency storage <br />bin. Refuse can be loaded from this bin into 20 ton trucks <br />for temporary surface disposal. The screen drainage (-0.5 a~n <br />particles) reports to the fine refuse static thickener. <br />When the coarse refuse underground disposal system is <br />operational, the jig refuse is directed to the refuse crusher <br />for sizing to a 2 in. top size. The sized waste drops into <br />the slurry preparation tank and is subsegnently pumped under- I <br />ground by a series of centrifugal pumps. <br />• <br />