Researchers traveling: Heikkilä, Kärnä, Pauna & Visuri in Düsseldorf, Germany

The 4th European Steel Technology and Application Days (ESTAD) were held in Düsseldorf, Germany from June 24 to 28, 2019. The conference was attended by Dr Anne Heikkilä, Dr Aki Kärnä, Henri Pauna and Dr Ville-Valtteri Visuri from Process Metallurgy Research Unit.

On June 25, Visuri held a presentation on mathematical modelling of hot metal desulphurisation. This work represents a work step towards a phenomena-based mathematical model for hot metal desulphurisation. The model was applied for modelling two sets of data on hot metal desulphurisation with lime. The preliminary results suggest that the model is capable of predicting the final sulphur content with high accuracy.

A study entitled “Reduction of iron ore pellets, sinter and lump ore under simulated blast furnace conditions” was presented by Heikkilä on June 25. The paper presents results on the reducibility of iron ore pellets, sinter and lump ore at simulated blast furnace shaft atmosphere. The experiments were ran under isothermal conditions for four different temperatures.

A paper entitled "Modifying the EAF voltage tap profile for lowering electrode tip consumption and increased energy efficiency" was delivered by Dr Matti Aula (Luxmet Oy) on June 26. In this work, a new EAF voltage tap profile was derived with the aim to provide an alternative "economy mode" for scenarios where the EAF is not the bottleneck of meltshop activities. The paper is based on the Master´s thesis (T. Veijola) completed at the Process Metallurgy Research Unit and was co-authored by Visuri and Prof. Timo Fabritius.

A paper concerning the numerical modelling of slag cooling was presented by Dr Aki Kärnä on June 27. This paper presents a 1-D heat transfer model for cooling of AOD slag under the conditions of ambient or water cooling. The results suggest that above a certain threshold value of water flow rate, the cooling rate becomes controlled by the heat conductivity of slag and the cooling rate cannot be expedited by increasing the water flow rate further.

On June 27, Henri Pauna delivered a presentation entitled " Development of process control for industrial electric arc furnaces with optical emission spectroscopy". In this paper, optical emission spectroscopy with plasma diagnostics was employed to obtain information about the electric arc properties during the operation of an electric arc furnace. It was concluded that the arc is visible for high alloyed steel grades before the end of heat and that the spectra are dominated by the light emissions from the slag components.

Bibliographical information

  • A. Kärnä, P. Sulasalmi, V.-V. Visuri, T. Fabritius, P. Torvinen, and J. Koskinen, “Numerical modelling of slag cooling,” Proceedings of the 4th European Steel Technology and Application Days, Düsseldorf, Germany, Stahlinstitut VDEh, 2019.
  • A. Heikkilä, H. Bartusch, T. Fabritius, M. Iljana, “Reduction of iron ore pellets, sinter and lump ore under simulated blast furnace conditions”, Proceedings of the 4th European Steel Technology and Application Days, Düsseldorf, Germany, Stahlinstitut VDEh, 2019.
  • H. Pauna, M. Aula, J. Seehausen, M. Huttula, T. Fabritius, and J. Klung, "Development of process control for industrial electric arc furnaces with optical emission spectroscopy," Proceedings of the 4th European Steel Technology and Application Days, Düsseldorf, Germany, Stahlinstitut VDEh, 2019.
  • T. Veijola, M. Aula, N. Hyttinen, V.-V. Visuri, M. Jokinen, and T. Fabritius, “Modifying the EAF voltage tap profile for lower electrode tip consumption and increased energy efficiency,” Proceedings of the 4th European Steel Technology and Application Days, Düsseldorf, Germany, Stahlinstitut VDEh, 2019.
  • V.-V. Visuri, P. Sulasalmi, T. Vuolio, T. Paananen, T. Haas, H. Pfeifer, and T. Fabritius, “Mathematical Modelling of the Effect of Reagent Particle Size Distribution on the Efficiency of Hot Metal Desulphurisation,” Proceedings of the 4th European Steel Technology and Application Days, Düsseldorf, Germany, Stahlinstitut VDEh, 2019.

Last updated: 4.10.2019