| 摘要 |
A device for blowing gas and a finely-divided solid into a metallurgical melt is disclosed, the device having a blast pipe which has at one end an inlet connected to a gas source and at the opposite end an outlet immersed below the melt surface in order to blow the gas into the melt. A cooling device surrounds the blast pipe, the cooling device having, at that end which is near the blast-pipe inlet, inlets and outlets for the cooling medium, and a mantle of ceramic material which surrounds at least the lower part of the cooling device. In the outlet of the blast pipe there is a Laval nozzle which is at an angle to the blast pipe and extends through the thermally insulating mantle. The cooling device further consists of smaller-diameter cooling pipes parallel to the blast pipe, the inlets of the cooling pipes being intended to be connected to a source of a gas-liquid mixture which vaporizes rapidly in the cooling device, and the mantle is surrounded by a graphite or silicon carbide sleeve, which is at least so thick that it protects the ceramic material when the device is lowered into the melt, so that the ceramic material reaches the temperature of the melt more slowly than the sleeve does and sinters before the sleeve wears out.
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