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VERSION:2.0
METHOD:PUBLISH
BEGIN:VEVENT
ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 02
SUMMARY:Optimizing an iron ore pellet for hydrogen-based iron and steel production - focusing on CaO/SiO2-ratio
DESCRIPTION:In view of transforming the heavily fossil-dependent iron and steel production into a fossil-free hydrogen-based production, the iron ore pellet could be modified to better suit the fossil-free iron and steel production, including the whole value chain. Considering the higher production cost associated with green hydrogen, the pellet could be optimized to save both material and energy costs during the melting and refining processes of the hydrogen direct reduced iron (H-DRI). At the same time, the modified pellet must keep sufficient mechanical properties as well as reduction properties. A preliminary study is therefore conducted, where the effect of varying CaO/SiO2-ratio was studied with regards to mechanical properties of the pellet, the reduction rate, as well as the dephosphorization ability (wt% P in iron) of the resulting autogenous slag. For this purpose, pellets with three different CaO/SiO2-ratios were studied, ranging from 0.8-1.4. In addition, two iron ore discs were made to broaden the CaO/SiO2-ratio range from 0.2 to 2.4 for the dephosphorization study. The three pellets were supplied by LKAB. Cold compression tests were made to determine the mechanical property. A high temperature resistance furnace was then employed to both follow the reduction of the iron ore using 100% hydrogen, and for melting the H-DRI to study the dephosphorization. While the reduction rate and mechanical properties did not vary significantly within the studied CaO/SiO2-ratio range, it was found that small differences in basicity in the autogenous slag could affect the dephosphorization significantly. The present work therefore finds it highly possible to optimize an iron ore pellet to save material and energy costs during the melting and phosphorus refining.
CLASS:PUBLIC
DTSTART:20230614T092000
DTEND:20230614T094000
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