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VERSION:2.0
METHOD:PUBLISH
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 17b
SUMMARY:Challenges in electric arc furnace (EAF) steelmaking for reduction of CO2 emissions
DESCRIPTION:It has been known that approx. 7% emission of CO2 arises from the steel industry sector. Hence, many steel companies are trying to develop the electric arc furnace (EAF) steelmaking process instead of blast furnace (BF) and basic oxygen furnace (BOF) integrated routes by employing high amounts of direct-reduced iron (DRI) and/or hot briquetted iron (HBI) to reduce CO2 emission. The DRI/HBI as a substitute for virgin scrap in EAF has been used because DRI/HBI does not have tramp elements. Unfortunately, however, commercially available DRI contains the relatively high levels of phosphorus and gangue oxides, which adversely affects not only the steel properties but also the operation efficiency. There have been many reports of several metallurgical factors affecting the EAF operations with the use of high amounts of DRI/HBI. In the present paper, the challenging points should be carefully considered to achieve the improved EAF technology on the way to green steel will be reviewed, and the recent experimental and modeling research will be discussed. For example, we observed the morphology and distribution of elements with gangue oxides in HBI and investigated the phenomena occurred in EAF process using fully HBI as an alternative iron source using a high-frequency induction furnace. Main component of gangue oxides in HBI was SiO2, Al2O3, and CaO in conjunction with unreduced iron oxide. To increase the dephosphorization efficiency, the distribution ratio of phosphorus between metal and slag was calculated using FactSage thermochemical computing software and was compared to the measured results. The optimization of slag chemistry is required not only for maximum dephosphorization efficiency with good slag foamability but also for minimum slag volume with less refractory corrosion.
CLASS:PUBLIC
DTSTART:20230614T141000
DTEND:20230614T143000
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