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VERSION:2.0
METHOD:PUBLISH
BEGIN:VEVENT
ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 18a
SUMMARY:Melting behavior of hot briquetted iron (HBI) and dephosphorization efficiency in EAF process condition
DESCRIPTION:In order to reduce CO2 gas emission, steel companies are trying to develop the EAF steelmaking process instead of BF(–BOF) route by employing high amounts of DRI/HBI. DRI/HBI as a substitute for virgin scrap in EAF have been used because DRI/HBI does not have tramp elements. Unfortunately, however, commercially available DRI contains a relatively high level of phosphorus, which adversely affects the properties of steels. Although the previous studies on melting and phosphorus removal behavior in an EAF process involving partial use of DRI/HBI in conjunction with virgin scrap have been studied, the melting and dephosphorization behavior in EAF process conditions employing the 100% DRI/HBI have been less frequently investigated. Hence, 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 at 1550oC. Main composition on gangue oxide in HBI was SiO2, Al2O3, and CaO in conjunction with unreduced iron oxide. Various size distribution of SiO2-(Al2O3-CaO) particles were entrapped in reduced iron matrix as well as in unreduced iron oxide phase. Small amount of siliceous slag was formed when HBI was melted, thus, phosphorus content in steel was not varied during the melting stage. This is possibly due to the formation of relatively acidic slag chemistry. To increase the dephosphorization efficiency, the distribution ratio of phosphorus between metal and slag was calculated using FactSage software by adding CaO in the furnace. The distribution ratio of phosphorus increases by adding CaO up to about 50% beyond which the melting point of slag is over 1500oC. So, the optimization of CaO content in the slag are required not only for maximum dephosphorization efficiency with good foamability but also for minimum slag volume with less refractory corrosion.
CLASS:PUBLIC
DTSTART:20230614T092000
DTEND:20230614T094000
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