A study on gas-solid and solid-solid reactions using a new tg setup
2015 (English)In: Proceedings of the 6th International Congress on the Science and Technology of Steelmaking, ICS 2015, Chinese Society for Metal , 2015, 902-905 p.Conference paper (Refereed)
A new thermogravimetric setup was designed to perform well-controlled investigation of kinetics of gas-solid and solidsolid reactions. Comparison of the conventional thermogravimetric procedure with the present method was carried out. Variations in reducing gas concentration during the initial steps of reaction were avoided in this setup. Thus, the rates of gaseous reduction of Fe2O3 by the new method were higher than the conventional TGA technique. It was also possible to perform isothermal solid-solid reactions in this system. Influence of temperature, gas flow rate and pellet density on reduction of Fe2O3 pellets by H2-CO mixtures was studied. Higher temperatures enhanced the reduction rates. Using high gas flow rates at low temperatures decreased reduction rates. Slow diffusion of gases in pellets with higher densities lowered the reduction rates. Feasibility of using graphite for selective reduction of iron oxide in the zinc ferrite was investigated. The reaction rates were low and at 1073 K zinc was evaporated.
Place, publisher, year, edition, pages
Chinese Society for Metal , 2015. 902-905 p.
Direct reduction, EAFD recycling, Thermogravimetric analysis, Zinc ferrite reduction, Ferrite, Flow of gases, Gases, Intelligent control, Pelletizing, Reaction rates, Steelmaking, Zinc, Zinc compounds, Gaseous reduction, High gas flow rates, Isothermal solids, Selective reduction, Solid-solid reaction, Thermo-gravimetric, Zinc ferrite
IdentifiersURN: urn:nbn:se:kth:diva-194646ScopusID: 2-s2.0-84983132814OAI: oai:DiVA.org:kth-194646DiVA: diva2:1050463
6th International Congress on the Science and Technology of Steelmaking, ICS 2015, 12 May 2015 through 14 May 2015
QC 201611292016-11-292016-10-312016-11-29Bibliographically approved