| 摘要 |
PURPOSE:To provide a method of preparing granular coal having a desired ash content which can reduce the cost with respect to a waste oil treatment through effective utilization of a waste oil as a binder, by pulverizing coal to be deashed to prepare a water slurry and adding a waste oil as a binder to the water slurry. CONSTITUTION:A high-ash coal 1 and a low-ash coal 2 are mixed with each other. The mixture is stored in a blending vessel 3, then pre-ground with a coarse grinder so as to have a particle diameter of 3mm or less and fed into a coal mixer 12. A part of the mixture is further pulverized as coal to be deashed with a wet pulverizer 5 so as to have a diameter of 100-500mum and then fed into a slurry tank 7, where it is agitated 6 to obtain a water slurry having a concn. of 10-30%. The water slurry is fed into a deashing-granulating machine 8. Meanwhile, a waste oil, such as an engine oil, a gear oil or tar, is fed as a binder from a waste oil tank 9 at a given proportion into the deashing-granulating machine 8, where the water slurry is deashed and granulated into coal having a diameter of 2-3mm and an ash content of, e.g., about 7%. The granulated coal is dehydrated in a dehydrating device 10 and fed through a granulated coal hopper 11 into the coal mixer 12 to conduct coal blending. A coke oven 13 is charged with the coal blend thus obtd. On the other hand, the ash-contg. water is fed into a table thickener 14 and a filter press 15 to remove ash contained therein and then circulated for reuse.
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