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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 02
SUMMARY:New routes for magnetite processing in a carbon restrained world
DESCRIPTION:Magnetite ores have the significant advantage of being able to be easily concentrated via magnetic separation, which is now becoming even more important as there is general shift towards DRI processes away from Blast Furnace ironmaking. For many DRI processes, any gangue in the ore is retained in the product, which is expensive to remove via electric melting, so minimising gangue in the ore is an economic priority. In the current ironmaking technologies, it is common to prepare magnetite ores for processing by firstly oxidising to hematite during pelletisation and sintering. This oxidation is carried to improve the reducibility of the iron ore for the subsequent ironmaking process. This improvement in the kinetics comes at a cost in terms of CO2 generation and/or consumption of Hydrogen (an expensive reductant). It is estimated that up to 130 kg of CO2 could be saved by not oxidising magnetite if the issue of reducibility could be addressed.  Researchers at Swinburne University of Technology, in collaboration with CSIRO, has been studying how to improve the reducibility of magnetite ore by combining magnetite with lime and measuring the subsequent physical properties and reducibility.  Lime is required in the steelmaking process, so introducing lime in the agglomeration step should not necessarily add cost. Substantial testing under laboratory conditions of different combination of magnetite with lime and other gangue oxides (alumina and silica) to form both pellets and sinter have shown that addition of lime (up to 7 wt.%) can significantly increase the reducibility of magnetite without sacrificing important mechanical properties required for subsequent ironmaking operations. Studies using Hydrogen as a reductant, have come to similar conclusions. This paper will summarise the key findings of this work and explore how these findings could be commercially exploited.
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DTSTART:20230614T114000
DTEND:20230614T120000
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