Method for dispensing a fluidizable solid from a pressure vessel

US3955966A · kind A · utility

Assignee

• August Thyssen-Hutte AG

Inventor

• Walter Meichsner · Krefeld, DE

Key dates

• Filing date: Jul 30, 1974
• Grant date: May 11, 1976
• Expiry date: Jul 30, 1994

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C21C1/02
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

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 m…