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For the preparation of porous plugs, 15 different mixtures from magnesia (MgO) and spinel (MgO*Al(2)O(3) with different grain size distribution and composition have been prepared and characterized. Four of them have been selected for detailed evaluation. In the 5 kg VIF, 6ppm [O] have been achieved with the combination of vacuum and argon bubbling through the porous plug. The removal of nitrogen was also efficient. In the 50 kg inert gas IF, 15 ppm of [O] have been achieved for relatively low bubbling rate. Moreover, a constant flow rate during the entire treatment shows better results compared to higher flow rate at the beginning and decreasing it towards the end. Technicum scale test heat in the 80 kg VIF using the developed special porous plug for soft bubbling (fine bubbles) were performed. Using argon and nitrogen as treatment gases, it was found that argon led to better oxygen removal. Finally, water model assessment of the special porous plug for the production of super clean steels was performed. The mixing times for the porous plugs that measured were within the range of the conventional porous plugs and tuyeres. The water model results concerning the liquid-liquid mass transfer showed that for low flow rates (below Q(critical)) the removal of the inclusions was more effective, and therefore confirmed the results of the hot tests.

Additional information

Authors: PAPAMANTELLOS D C, Metlab, Patras (GR);ANGELOPOULOS G N, Metlab, Patras (GR);DOURDOUNIS E, Metlab, Patras (GR);GOTSIS V, Corinth Pipeworks, Corinth (GR);CATANA C, EPO, Munich (DE);MAVROMATIS K, RWTH, Aachen (DE);WECKES J, RWTH, Aachen (DE)
Bibliographic Reference: EUR 20597 EN (2003), 65pp. Euro: 10.00
Availability: EUR-OP reference: KI-NA-20597-EN-S Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-4823-7
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