01:00 pm
New Ways To Destroy Refractories - the Future of Green Steelmaking!
Tom Vert | Strategic Refractory Consulting Inc | Canada
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Tom Vert | Strategic Refractory Consulting Inc | Canada
The "Carbon Challenge" that we are all trying to address is a major change in refractory customer manufacturing processes. Changes in steel plants to move to "green" steel will include removal or major modification of coke ovens, blast furnaces and basic oxygen furnaces; a shift to electric furnace (EAF) steelmaking with possible oxygen addition, direct reduced iron (DRI), liquid iron, hot briquetted iron (HBI); and the injection of hydrogen into any or all of these processes and/or any combination of all of the above!
A natural move from BOF wear rates of approximately 0.2mm/heat to EAF wear rates of 1mm/heat alone will increase refractory consumption regardless of any of the other technologies. The engineered move to each of the above changes and combinations thereof will increase the wear mechanisms of the refractories by an unknown factor also. Higher gangue ratios in DRI, use of EOF or Conarc furnaces, in the EAF technical space will raise major wear challenges to the refractories being used. And of course, it is still very early to see what the addition of high temperature hydrogen and/or steam as a byproduct will do!
This paper will attempt to predict the future of wear mechanisms and wear rates of "green steelmaking" with the prediction that no matter what...we will find new ways to destroy refractories! (and of course, new refractories to withstand these changes)
01:20 pm
Transformation to hydrogen-based steel making and refractory challenges at thyssenkrupp Steel Europe AG in Duisburg
Dr. Matthias Weinberg | thyssenkrupp Steel Europe | Germany
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Dr. Matthias Weinberg | thyssenkrupp Steel Europe | Germany
Katrin Kursch | thyssenkrupp Steel Europe AG | Germany
In 2045 tkSE wants to be climate neutral. To reach the goal the existing blast furnaces have to be replaced by direct reduction plants and smelters.
The change will be challenging for the plant site as well as for the refractory material. tkSE wants to use hydrogen gas for the production of up to 2,5 mio to/ a hot metal.
tkSE started already in 2019 the first researches and development projects for new refractory materials together with plenty of suppliers, universities and external labs.
The behaviour of different materials under hydrogen atmosphere as well as under a mixed gas atm with H2 and NG are investigated. Another big field of investigation is the smelter which works under a reducing atmosphere. Melting down a big amount of DRI with a blast furnace like slag is not a common operation and also a challenging operation for the refractory.
01:40 pm
Decarbonisation of Steel Industry and its Impact on future slag
Prof. Dr.-Ing. Olena Volkova | TU Bergakademie Freiberg | Germany
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Prof. Dr.-Ing. Olena Volkova | TU Bergakademie Freiberg | Germany
The current transformation of the steel industry will be presented. The latest and planned measures for CO2 reduction in steel production will be shown. Two possible production routes, hydrogen-based direct reduction with electric arc furnace (DR-EAF) and hydrogen-based direct reduction with basic oxygen furnace via submerged arc furnace (DR-SAF-BOF) are explained. Possible changes in future slag and metallurgical treatment such as dephosphorisation are addressed.