Metallurgical apparatus – Means for melting or vaporizing metal or treating liquefied... – By providing – treating or protecting environment – e.g. – vacuum
Patent
1984-05-16
1986-10-07
Rosenberg, Peter D.
Metallurgical apparatus
Means for melting or vaporizing metal or treating liquefied...
By providing, treating or protecting environment, e.g., vacuum
266236, 266238, 266239, 75 46, 75 49, C22B 700
Patent
active
046155112
ABSTRACT:
In a continuous steelmaking method, a molten metal bath is maintained within a rotary furnace heated by oxy-fuel burners at the charge and discharge ends. Metallic iron charge material such as iron and steel scrap or sponge iron is preheated primarily by heat transferred from the furnace exhaust gases, on an enclosed recuperative conveyor before being introduced through the charge end opening. Molten metal is withdrawn through a siphon tube submerged in the bath through the furnace discharge end opening into a vacuum chamber which is part of an integral vacuum chamber-tundish combination incorporating a molten metal column under vacuum in one leg and a molten steel tundish casting pool under atmospheric pressure as the other leg, connected via a submerged channel. As steel is cast out of the tundish through a submerged nozzle, it is replenished by way of the column from vacuum-induced flow through the siphon tube, metal surface levels in column and tundish remaining substantially constant once casting has been established. Several means are provided for regulating withdrawal and casting rate, including the use of slide-gate valves and varying the vacuum pressure, and also a procedure for initiating the method without pre-filling the vacuum chamber-tundish with starting molten metal. Optional features include oxygen injection into the vacuum chamber, argon stirring for degassing and alloy additions through a sealed conduit or by injection. According to the invention, continuous flow of material may be realized from charging and preheating of the charge through to continuous introduction of the steel into the casting molds, with only a very small vertical descent between charging and pouring. Other salient advantages include very high overall energy efficiency, low capital costs, negligible furnace to mold temperature losses, efficient steel degassing, high alloy recoveries, flexible steel chemistry control, wide range of acceptable charge materials, and clean pollution-free operation.
REFERENCES:
patent: 3692443 (1972-09-01), Lightner
patent: 4105438 (1978-08-01), Sherwood
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