Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1974-07-30
1976-05-11
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 53, 75 55, C21C 702
Patent
active
039559661
ABSTRACT:
An improvement in the method of desulfurizing molten pig iron by forming a fluidized stream of a solid desulfurizing agent consisting of finely divided calcium carbide which is contained in a pressure vessel which comprises a discharge connected to an immersion lance by a conveying pipe, by injecting a fluidized gas at a pressure upwardly into the desulfurization agent, withdrawing the resultant fluidized desulfurizing agent from the pressure vessel, introducing a separate stream of gas into the conveying pipe and conveying said fluidized desulfurizing agent together with the fluidizing and feeding gases into the pig iron through said immersion lance, determining the amount of the solid desulfurizing agent, and the through-flow quantity of gas flow, being the sum of amount of fluidizing gas and the amount of feeding gas, and maintaining a predetermined gas/solid ratio which improvement comprises using as the desulfurizing agent finely divided calcium carbide mixed with a solid material which decomposes or evaporates at the temperature of the molten pig iron thereby evolving a gas and withdrawing the fluidized desulfurization agent from said pressure vessel and feeding it into the molten pig iron at a rate of between 70 and 250 kilograms per minute and maintaining the gas/solid ratio at a value in the range of 2 to 12 normal liters per kilogram.
REFERENCES:
patent: 1922037 (1933-08-01), Hardy
patent: 2779675 (1957-01-01), Vennerholm
patent: 2803533 (1957-08-01), Bieniosek
patent: 3368885 (1968-02-01), Volianik
patent: 3551139 (1970-12-01), Schokkenbroek
patent: 3575695 (1971-04-01), Miyashita
patent: 3598573 (1971-08-01), Freissmuth
patent: 3702151 (1972-11-01), Blok
patent: 3716352 (1973-02-01), Ooi
August Thyssen-Hutte AG
Rosenberg Peter D.
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