ISSN 2594-5300
27º Seminário de Aciaria — Vol. 01 , num. 27 (1996)
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Abstract
The Continuous Steelmaking Process called CONSTEEL® is designed to use commercial scrap grades, as per specification of the Institute of Scrap Iron and Steel Inc., without any preparation. The process is guaranteed to use 380 kWh/mt of energy (350 kWh/mt are achieved in plants in operation), 25 Nm³/mt of oxygen and 1.7 kg/mt of electrode in AC furnace using scrap, yielding 94% of liquid steel. Specific consumption drop to 340 kWh/mt (325 kWh/mt and less are achieved) and 1.7 kg/mt of electrode with 35 Nm³/mt of oxygen. Direct Reduced Iron (DRI), in pellet or briquetted (HBI), can be used in any percentage. Specific consumptions for steel from DRI and scrap with yield lower than 94% will obviously differ. Hot metal in variable percentages can be fed continuously with balance of iron consisting of DRI and preheated scrap. Given the importance of feeding a consistent mix of the charge, substantial changes occur in the handling and charging of the raw materials to the feeding system. The consistent mix of scrap fed to the furnace is required for both: to have the needed control on the steel quality in the furnace bath, and to have the necessary control on the volume and analysis of flue gas exiting the preheater. The same consistency in the charging rate is desirable for the hot metal, DRI and HBI.
The Continuous Steelmaking Process called CONSTEEL® is designed to use commercial scrap grades, as per specification of the Institute of Scrap Iron and Steel Inc., without any preparation. The process is guaranteed to use 380 kWh/mt of energy (350 kWh/mt are achieved in plants in operation), 25 Nm³/mt of oxygen and 1.7 kg/mt of electrode in AC furnace using scrap, yielding 94% of liquid steel. Specific consumption drop to 340 kWh/mt (325 kWh/mt and less are achieved) and 1.7 kg/mt of electrode with 35 Nm³/mt of oxygen. Direct Reduced Iron (DRI), in pellet or briquetted (HBI), can be used in any percentage. Specific consumptions for steel from DRI and scrap with yield lower than 94% will obviously differ. Hot metal in variable percentages can be fed continuously with balance of iron consisting of DRI and preheated scrap. Given the importance of feeding a consistent mix of the charge, substantial changes occur in the handling and charging of the raw materials to the feeding system. The consistent mix of scrap fed to the furnace is required for both: to have the needed control on the steel quality in the furnace bath, and to have the necessary control on the volume and analysis of flue gas exiting the preheater. The same consistency in the charging rate is desirable for the hot metal, DRI and HBI.
Keywords
continuous steelmaking, EAF, scrap feeding, DRI, charge materials
continuous steelmaking, EAF, scrap feeding, DRI, charge materials
How to cite
Vallomy, John A.; Manenti, Angelo.
IMPLICATION OF CONTINUOUS STEELMAKING IN EAF ON CHARGE MATERIALS HANDLING AND FEEDING,
p. 701-718.
In: 27º Seminário de Aciaria,
Porto Alegre, Brasil,
1996.
ISSN: 2594-5300, DOI 10.5151/2594-5300-27Aciaria-701-718
