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Title: Method for reducing iron losses in an iron smelting process

Abstract

A process of smelting iron that comprises the steps of: a) introducing a source of iron oxide, oxygen, nitrogen, and a source of carbonaceous fuel to a smelting reactor, at least some of said oxygen being continuously introduced through an overhead lance; b) maintaining conditions in said reactor to cause (i) at least some of the iron oxide to be chemically reduced, (ii) a bath of molten iron to be created and stirred in the bottom of the reactor, surmounted by a layer of slag, and (iii) carbon monoxide gas to rise through the slag; c) causing at least some of said carbon monoxide to react in the reactor with the incoming oxygen, thereby generating heat for reactions taking place in the reactor; and d) releasing from the reactor an offgas effluent, is run in a way that keeps iron losses in the offgas relatively low. After start-up of the process is complete, steps (a) and (b) are controlled so as to: e) keep the temperature of the molten iron at or below about 1550.degree. C. and f) keep the slag weight at or above about 0.8 tonne per square meter.

Inventors:
 [1];  [2]
  1. Airmont, NY
  2. Greenville, SC
Issue Date:
Research Org.:
AMERICAN IRON & STEEL INST
OSTI Identifier:
872203
Patent Number(s):
5885322
Assignee:
Steel Technology Corporation (Washington, DC)
Patent Classifications (CPCs):
C - CHEMISTRY C21 - METALLURGY OF IRON C21B - MANUFACTURE OF IRON OR STEEL
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02P - CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
DOE Contract Number:  
FC07-94ID13284
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; reducing; iron; losses; smelting; process; comprises; steps; introducing; source; oxide; oxygen; nitrogen; carbonaceous; fuel; reactor; continuously; introduced; overhead; lance; maintaining; conditions; chemically; reduced; ii; bath; molten; created; stirred; bottom; surmounted; layer; slag; iii; carbon; monoxide; gas; rise; causing; react; incoming; generating; heat; reactions; taking; releasing; offgas; effluent; run; relatively; start-up; complete; controlled; temperature; below; 1550; degree; weight; tonne; square; meter; monoxide gas; chemically reduce; continuously introduced; square meter; carbon monoxide; iron oxide; carbonaceous fuel; molten iron; smelting iron; reducing iron; gas effluent; oxide gas; chemically reduced; /75/

Citation Formats

Sarma, Balu, and Downing, Kenneth B. Method for reducing iron losses in an iron smelting process. United States: N. p., 1999. Web.
Sarma, Balu, & Downing, Kenneth B. Method for reducing iron losses in an iron smelting process. United States.
Sarma, Balu, and Downing, Kenneth B. Fri . "Method for reducing iron losses in an iron smelting process". United States. https://www.osti.gov/servlets/purl/872203.
@article{osti_872203,
title = {Method for reducing iron losses in an iron smelting process},
author = {Sarma, Balu and Downing, Kenneth B},
abstractNote = {A process of smelting iron that comprises the steps of: a) introducing a source of iron oxide, oxygen, nitrogen, and a source of carbonaceous fuel to a smelting reactor, at least some of said oxygen being continuously introduced through an overhead lance; b) maintaining conditions in said reactor to cause (i) at least some of the iron oxide to be chemically reduced, (ii) a bath of molten iron to be created and stirred in the bottom of the reactor, surmounted by a layer of slag, and (iii) carbon monoxide gas to rise through the slag; c) causing at least some of said carbon monoxide to react in the reactor with the incoming oxygen, thereby generating heat for reactions taking place in the reactor; and d) releasing from the reactor an offgas effluent, is run in a way that keeps iron losses in the offgas relatively low. After start-up of the process is complete, steps (a) and (b) are controlled so as to: e) keep the temperature of the molten iron at or below about 1550.degree. C. and f) keep the slag weight at or above about 0.8 tonne per square meter.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {1}
}

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