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VERSION:2.0
METHOD:PUBLISH
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ORGANIZER;CN=ESTAD 2023:mailto:info@metec-estad.com
LOCATION:Room 14b
SUMMARY:The application of hydrochar for the direct-reduction processes
DESCRIPTION:Replacement of the blast furnace process with direct-reduction (DR) process coupled to an electric arc furnace is the key to realizing low-CO2 steelmaking and a climate neutral economy for Sweden. Direct-reduced iron (DRI) can be produced from reduction of iron ore pellets with H2 or CO gases in a shaft furnace, or from heating of carbon-containing pellets in a rotary hearth furnace. The addition of biomass to the pellets increases the porosities and thus the reducibility of pellets in both processes. The volatiles released from biomasses contain some amounts of reducing gases, such as H2, CO, and CH4, which can also contribute to the reduction degree and kinetics. By using biomass-containing pellets, a lower reduction temperature or a shorter reduction period could be obtained in both DR processes, which increases process efficiency and decreases energy consumption. Hydrochar is a bio-coal produced from hydrothermal carbonization treatment of organic wastes.  Hydrochar has high volatile content and it may also act as an effective organic binder, which can be used for iron ore pellets making and carbothermic reduction.
In this study, two carbon-containing materials: a Lemon Peel Hydrochar (LPH) and an Anthracite were separately mixed with an iron oxide-containing material (pellet fine, PF) at a Cfix/O ratio of 0.7 for reduction. The mixtures were pressed into briquettes (~30 g) and heated up in N2 atmosphere at a heating rate of 5 K/min up to two final temperatures. The reduction degree of PF by the volatiles released from the carbonaceous materials was determined by heating up to 750 °C, and that by combination of volatiles and residual carbon up to 1100 °C. The significance of the obtained results for the gas-based and coal-based DR processes were discussed, followed by some concluding remarks at the end. 

CLASS:PUBLIC
DTSTART:20230615T142000
DTEND:20230615T144000
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