| 摘要 |
A process and apparatus carries out the direct removal of slag (7) floating on the molten metal (6) within a metallurgical furnace via vacuum suction-tube (8) which is inserted from above through a furnace discharge opening (5). The tube discharge is connected into an evacuated external slag-cooling chamber (12), within which the slag stream exiting the suction-tube is granulated by impinging water jets (16). The water and entrained slag granules descend by gravity through a communicating water-column vacuum-leg (18), terminating in a atmosphere-exposed pool (22), within which the granules are collected on a conveyor (25) which dewaters the granules while carrying the slag out of the pool (22) to an external pile (28) or bin. The invention is capable of realizing slow slag discharge at controlled rates over long time periods, as well as in conjunction with the simultaneous and continuous metal withdrawal by a somewhat analogous metal syphon tube (38) into an evacuated metal withdrawal chamber (37) for casting. It is particularly suited to discharge via the annular discharge opening from oxy-fuel fired rotary furnaces and the preferred embodiment includes effective means for closure and sealing of the discharge opening, concurrently with furnace heating and withdrawal of metal and slag. Appropriate means are also provided for positioning and supporting the vacuum chamber assemblies, also inserting and removing the slag and metal tubes, in a coordinated non-interfering manner. |
