Specialized metallurgical processes – compositions for use therei – Compositions – Solid treating composition for liquid metal or charge
Patent
1990-04-06
1994-01-18
Andrews,, Melvyn
Specialized metallurgical processes, compositions for use therei
Compositions
Solid treating composition for liquid metal or charge
75312, 75301, C21B 504
Patent
active
052796396
ABSTRACT:
This invention relates to the refining of steel external to a primary steelmaking vessel, for example in the ladle. More particularly, it is: A.) a method of synthesizing a slag on the steel that (i) mitigates the detrimental effects of existing natural slag carried over from the primary steelmaking vessel, (ii) is low in specific bulk density, due to gas evolution and foaming, (iii) is suitable for refining of steel, and (iv) is not aggressive to the ladle refractory lining; B.) a method, and composition for treating any primary slag that has entered the ladle; C.) a method and composition for coating refractory linings. The present invention involves the manufacture in situ of a secondary ladle slag, the treating of ladle slag, and the protection of refractory linings by the addition of materials including calcium carbide, foaming agents such as one or more carbonates of calcium, magnesium, and sodium, and other components used to adjust slag composition. The properties of the secondary ladle slag are engineered using an optical basicity scale.
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International Symposium on Ladle Steelmaking and Furnaces; Metallurgical Society of CIM, Aug. 28-31, 1988, pp. 130-143.
"Plasma Heating for Ladle Treatment Stations", Iron and Steelmaker, Jul., 1989, pp. 17-22.
L. Wolfe, et al., "Quality Improvements at Border Steel Through Ladle Metallurgy and Caster Modifications," Iron & Steelmaker, pp. 33-41, Jul., 1988.
Kemeny Frank L.
Sosinsky David J.
Andrews Melvyn
TAM Ceramics, Inc.
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