Process and device for heating and melting lumps of sponge iron
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United States of America Patent
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Sep 19, 1995
Grant Date -
N/A
app pub date -
Mar 18, 1994
filing date -
May 21, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
For heating sponge iron to temperatures of about 850.degree. C. without substantial oxidation losses, there are provided at least two separate preheating stages at different temperatures, to which the sponge iron is successively fed and in which the temperature and the gas atmosphere are respectively individually controlled in such a way that a chemically neutral gas atmosphere is set in the first preheating stage at the lowest temperature and a reducing gas atmosphere is set in the last preheating stage at the highest temperature. The hot gas for the preheater is obtained at least in part from the waste gas from the melting furnace, to which the preheated sponge iron is fed.
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