PURPOSE: To granulate efficiently coal with less electric power consumption, by a method wherein the granulating process of a coal-water pulp is divided into a plurality of small-scale processes every process is performed in each different agitation tank, and the concentration of the pulp is increased in turn according to the movement.
CONSTITUTION: The stock soln. 7 of a coal-water pulp and a binder 8 are introduced into the first agitation tank 1. The mixture is stirred for 15min by means of the first agitator 4 to effect the mixing and transferred to the second agitation tank 2 by means of a pump 18. At the same time, the stock soln. 7 and the binder 8 are introduced into the agitation tank 1 to conduct an agglomeration process. The supernatant liquid of the pulp liquid transferred to the agitation tank 2 is supplied to a granule-receiving tank 14 by means of a pump 21 to drain water from the tank. The pulp liquid having increased pulp concentration within the agitation tank 2 is stirred by means of a second agitator 5 to make granule grow, and then supplied to the third agitation tank 3 by means of a pump 19. The supernatant is pumped out by using a pump 22 to increase the concentration of the pulp. The pulp is stirred by means of the third agitator 6 to concentrate it, and poured onto the wire gauze 16 of the receiving tank 14 by means of a pump 20 to recover the granule 17.
KURIHARA MICHIO
NAKAMURA YOUICHI
HIRATSUKA YUKIYA
MARUKO MORIHISA
HITACHI LTD