Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1977-04-19
1978-08-08
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 46, 75 65R, 75 93R, 75129, 75135, 266239, C21C 710
Patent
active
041054385
ABSTRACT:
A refractory siphon tube is inserted through the axial discharge opening of a rotary melting furnace and down through the slag into the metal within the furnace. Molten metal is withdrawn continuously by suction through the tube into an enclosed chamber maintained under a controlled negative suction pressure through a suction manifold connecting with a receiver, vacuum pump and pressure controller. The enclosed chamber discharges by gravity through a bottom opening, either emptying into a launder with an overflow weir, or discharging directly out through a bottom nozzle equipped with a slide-gate shut-off. The metal is discharged continuously at a controlled rate irrespective of any variations in the feed rate and metal depth in the furnace. The metal depth can be varied by periodically varying the suction pressure and thus can provide for intermittent slag discharge by overflowing the annular discharge opening. The depth of the enclosed chamber may be varied as desired, a high vacuum pressure being logically employed with the deeper units which thus also act as vacuum degassers for removing dissolved gases in the molten metal.
REFERENCES:
patent: 3385585 (1968-05-01), Kawawa
patent: 3467167 (1969-09-01), Mahin
patent: 3558121 (1971-01-01), Lenne
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