Methods and apparatus for reducing corrosion in refractory linings
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.
- Inventors:
-
- Glen Ellyn, IL
- Oak Lawn, IL
- Plainfield, IL
- Issue Date:
- Research Org.:
- WELSH & KATZ
- OSTI Identifier:
- 866416
- Patent Number(s):
- 4705563
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C21 - METALLURGY OF IRON C21C - PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL
F - MECHANICAL ENGINEERING F27 - FURNACES F27B - FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL
- DOE Contract Number:
- AC02-84GC20057
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- methods; apparatus; reducing; corrosion; refractory; linings; provided; lining; liquid-containing; vessel; direct; steelmaking; processes; operates; 1600; degree; 1800; oxygen; partial; pressure; 10; -12; atmospheres; creating; slag; rich; feo; significant; level; chromium; oxide; interconnected; pores; filled; gas; mixture; total; associted; liquid; forced; continuously; manner; creates; blanket; increases; maintain; selected; valence; decreased; solubility; increasing; useful; life; useful life; steelmaking processes; total pressure; oxygen partial; gas mixture; partial pressure; chromium oxide; refractory lining; reducing corrosion; steelmaking process; containing vessel; /75/266/
Citation Formats
Poeppel, Roger B, Greenberg, Sherman, and Diercks, Dwight R. Methods and apparatus for reducing corrosion in refractory linings. United States: N. p., 1987.
Web.
Poeppel, Roger B, Greenberg, Sherman, & Diercks, Dwight R. Methods and apparatus for reducing corrosion in refractory linings. United States.
Poeppel, Roger B, Greenberg, Sherman, and Diercks, Dwight R. Thu .
"Methods and apparatus for reducing corrosion in refractory linings". United States. https://www.osti.gov/servlets/purl/866416.
@article{osti_866416,
title = {Methods and apparatus for reducing corrosion in refractory linings},
author = {Poeppel, Roger B and Greenberg, Sherman and Diercks, Dwight R},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1987},
month = {Thu Jan 01 00:00:00 EST 1987}
}