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VERSION:2.0
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 16a
SUMMARY:Development of desulphurization flux for the hot metal in the KR process using recycled red mud as an industrial waste
DESCRIPTION:One of the industrial wastes after alumina production from bauxite, red mud, was assessed as an additive to lime, as a new desulfurization flux for the hot metal in the steelmaking process.  Its role in facilitating the melting of the lime was primarily investigated.  Keeping in mind that the desulphurization mechanism under mechanical stirring such as in the KR process is different from that without mechanical stirring, a series of laboratory scale tests were carried out with a device for inducing mechanical stirring in the hot metal.  A number of variables (mixing ratio between lime and red mud, pre-reduction of red mud, mechanical stirring, and additives to the lime/red mud mixture) were employed in order to elucidate the desulphurization mechanism and optimum chemistry of the desulphurization flux.  In order to assess the desulphurization efficiency in a more quantitative manner, a “DeS Index” was defined.  This takes into account the extent, rate, and cost of the desulphurization simultaneously.  With this index, it was found that the presently developed red mud-containing desulphurization flux showed almost similar desulphurization efficiency compared with those of commercially used desulphurization fluxes. It was even better than a typical lime/fluorspar mixed flux, which is now prohibited from being used in many companies due to its environmentally harmful character.  It is emphasized that the desulfurization efficiency should be assessed under mechanical stirring in order to be used in the KR-type desulphurization process.
CLASS:PUBLIC
DTSTART:20230615T094000
DTEND:20230615T100000
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