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VERSION:2.0
METHOD:PUBLISH
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ORGANIZER;CN='8th ECIC & 9th ICSTI 2022':MAILTO:info@ecic-icsti.com
LOCATION:Room „Borgward“
SUMMARY:Factors determining the best composition of the ferrous burden, not only in the blast furnace
DESCRIPTION:Numerous studies have been done to determine the best properties of each of the components of the blast furnace ferrous burden like for sinter, for pellets or for lump ore. The more difficult and interesting question is: how does the burden as a whole behaves inside the blast furnace when facing reduction, softening and melting. More difficult, since studies inside the furnace are nearly impossible and laboratory simulations never can cover the complete process.
The present paper shows data that have become available from analysis inside the furnace as well as resulting from laboratory tests. The following conclusions are reached:
-	Reducibility: it was found, that the reduction degree of materials with very different reducibilities are at 900-950 °C more or less identical. Furthermore, reducibility is the weighted average of the properties of each of the components.
-	Softening of a blend is much closer to the softening temperature of the material with the highest softening temperature. Softening and melting of a blend is not a weighted average of the properties of each of the components.
An example is shown, where in a blast furnace the pellet ratio is increased and what options exist with respect to pellet type (fluxed, acid, olivine) in conjunction with sinter basicity. 
The conditions for burden distribution at high pellet% are indicated and a strategy for using lump ores under varying conditions is discussed.
Understanding the interaction of reduction, softening and melting in conjunction with burden distribution is important as they are main contributers to blast furnace productivity.
The inherent know how on ferrous burden should also be applied to existing and newly developed shaft based direct reduction processes
CLASS:PUBLIC
DTSTART:20220630T115500
DTEND:20220630T122000
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