To open a substitute molten slag outflow port, even to when failing in opening a molten slag outflow port, and to enable molten slag to flow out of the other molten slag outflow port without interrupting the melting treatment even if slag solidifies in a bottom part of a melting furnace in the vicinity of the molten metal outflow port and to continuously perform melting treatment of a plurality of batches without replacing a brick for a molten slag outflow port, for every finishing of the melting treatment of one batch.
A plurality of molten slag outflow ports 2L and 2R are arranged at a prescribed interval in a bottom part of the melting furnace 1. The bricks for the molten slag outflow port open-cut with a plurality of molten slag outflow port 4 are arranged in the respective molten slag outflow ports 2L and 2R. A track 8 of a carriage 7 is arranged so that a slag receiving pan 6 can pass under the molten slag outflow ports 2L and 2R. When starting the outflow of molten slag of the slag, a molten slag outflow hole is opened by drilling a hole in packing of the molten slag outflow ports 4 by a rock drill by selecting any molten slag outflow port 4 of any molten slag outflow ports 2L and 2R. The slag is carried by the carriage 7 after discharging into the slag receiving pan 6 via a molten slag outflow gutter 3 from the opened molten slag outflow port 4, and cooled and solidified.
Yoshiaki Naito
Cui Shu Tetsu
Tadayuki Miyazaki
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