Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1986-10-23
1987-11-10
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 1014, 75 96, 266220, 266270, C22B 900
Patent
active
047055634
ABSTRACT:
Methods and apparatus are provided for reducing corrosion in a refractory lining of a liquid-containing vessel used in direct steelmaking processes. The vessel operates at between about 1600.degree. C. and about 1800.degree. C. and an oxygen partial pressure of about 10.sup.-12 atmospheres, creating slag which is rich in FeO. The refractory lining includes a significant level of chromium oxide (Cr.sub.2 O.sub.3), and has small interconnected pores which may be filled with a gas mixture having a higher total pressure and oxygen partial pressure than the total pressure and oxygen partial pressure associted with the liquid against the lining of the vessel.
The gas mixture is forced through the pores of the lining so that the pores are continuously filled with the mixture. In this manner, the gas mixture creates a blanket which increases the oxygen partial pressure at the lining enough to maintain the chromium in the lining in a selected valence state in which the chromium has decreased solubility in the FeO slag, thereby reducing corrosion by the FeO and increasing the useful life of the refractory lining.
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patent: 4560149 (1985-12-01), Hoffgen
Diercks Dwight R.
Greenberg Sherman
Poeppel Roger B.
Fisher Robert J.
Glenn Hugh W.
Hightower Judson R.
Rosenberg Peter D.
The United States of America as represented by the United States
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