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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 55534 (07)
- University: Sharif University of Technology
- Department: Materials Science and Engineering
- Advisor(s): Halali, Mohammad
- Abstract:
- The sponge iron of the Hoganas process have a high metallization degree (93-96%) and its carbon content is about 0.1%. These characteristics are suitable for powder metallurgy but in order to use this DRI for steelmaking, it needs lower metallization degree and higher content of carbon. First, for using Hoganas sponge iron for steel production, 94% of metallization is adequate as some of iron is still in the form of FeO which its reduction in Electric Arc Furnace (EAF) cause better agitation in order to utilize heat transfer. Also, excess carbon content in the DRI can have many advantages other than preventing the sponge iron from re-oxidation. Some of the carbon can be in the form of Fe3C that its dissociation in steel bath is exothermic and yields energy. Additionally, carbon decreases the amount of anthracite or injected graphite fines as the input of EAF. Furthermore, free carbon in the DRI can react with the FeO and produce CO2 which forms foaming slag that protect steel bath and internal wall of furnace. Thus, it is crucial to investigate an enhanced Hoganas process for steel industry purposes. In this research, studying parameters affecting the sponge iron carbon content and metallization, like temperature, time, particle size, ratio of reductant to iron ore concentrate and charged materials type (concrete cylinders) were discussed
- Keywords:
- Hoganas Process ; Sponge Iron ; Direct Reduction Process ; Carbon ; Cementite ; Coal
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