| 摘要 |
PURPOSE:To simplify the liquefaction process, and to enable the effective utilization of circulating solvent, by dressing coal powder by flotation, recovering the dressed coal powder as the refined froth, preparing an aqueous slurry containing said coal powder, and granulating the coal using a liquefied product of a coal liquefaction process as a binder. CONSTITUTION:Coal 11 is crushed usually to <=2-3mm. and thrown into a wet crusher 15 together with water 13 to obtain a coal-water slurry 17 having a coal powder concentration of preferably 3-15%. The slurry is if necessary diluted with water 19, and introduced into the flotation apparatus 25. Separately, the flotation apparatus 25 is fed with a collector (preferably circulation solvent) 21, a frothing agent, and if necessary, a pH-controlling agent. The mineral component is transferred to the flotation tail 27 by the flotation apparatus 25, and the coal having low ash content is recovered as the refined froth 29, which is introduced as a 10-50% aqueous slurry into the granulator 31, and granulated in water in the presence of the liquefied product 30 supplied from the liquefaction process 47.
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