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Title: 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:
 [1];  [2];  [3]
  1. Glen Ellyn, IL
  2. Oak Lawn, IL
  3. 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):
F - MECHANICAL ENGINEERING F27 - FURNACES F27B - FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL
F - MECHANICAL ENGINEERING F27 - FURNACES F27D - DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
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 = {1987},
month = {1}
}

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