PROBLEM TO BE SOLVED: To make the flowing-down position of molten slag constant regardless of discharge rate from a trough and to scarcely develop the clogging of a nozzle.;SOLUTION: The trough 1 is used for discharge of the molten slag from the nozzle 4 by once receiving the molten slag 3. A nozzle housing part 1b, where the bottom surface 1a at the trough inner surface side is protruded into the trough 1 by recessing the outer surface of the trough 1 into the inner surface side, is formed in the bottom part 1a at the upstream side from the end surface at the discharging side of the trough 1. In the nozzle housing part 1b, plural nozzles 4 provided with the discharging holes 4a are arranged on one or orthogonal lines 6 in the flowing direction 5 of the molten slag 7 in the trough 1. In this way, the flowing-out position and rate of the molten slag are stabilized, and nozzles for water and compressed gas can be approached to the molten slag flowing position as much as possible, thus the variation of the treating condition can be reduced, and the quality and yield of the slag product can be improved.;COPYRIGHT: (C)2002,JPO
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