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VERSION:2.0
METHOD:PUBLISH
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 18a
SUMMARY:Dissolution of spent refractories in electric arc furnace utilized in stainless steel production
DESCRIPTION:High amount of refractory materials are consumed in steelmaking due to high processing temperatures. Refractory materials typically contain MgO, which is also an important slag former in electric arc furnace (EAF). A normal EAF practice is to operate with slag composition close to MgO saturation limit to decrease the potential of the slag to dissolve MgO-containing refractories. One method to provide MgO to the slag is to charge crushed spent refractory bricks to EAF. 

The most important parameter in utilization of bricks is the dissolution speed of the crushed bricks. If the recycled bricks do not dissolve fast enough to slag, the liquid part of the slag is not saturated with MgO and the refractory wear is increased. In this work the dissolution of three spent refractories of different grain sizes are tested in chamber furnace containing a magnesia brick as a crucible. The starting slag is synthetic slag similar in composition to EAF slag obtained in stainless steel production prior the MgO dissolution. In the trials different spent refractories are added to the synthetic slag mix to provide MgO. The holding time and temperature is set to obtain MgO saturation of slag when no sources of MgO are used in the original mix.

The slag samples obtained from the chamber furnace are analyzed with x-ray fluorescence spectrometry (XRF) to obtain the overall composition and with scanning electron microscope (SEM) to acquire qualitative estimate of the presence of undissolved refractories in the slag. The change of total MgO content of the slag with different MgO sources is evaluated to obtain the estimate of the amount of undissolved spent refractory. 

CLASS:PUBLIC
DTSTART:20230615T132000
DTEND:20230615T134000
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