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Effect of Density on the Reduction of Fe2O3 Pellets by H2-CO Mixtures
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This study aims to find how density affects the reduction extent and reduction rate. H2-CO gas mixture is used as reducing agent. Five groups of different density pellets were reduced at four different temperatures. Light optical microscope (LOM) and scanning electron microscope with energy dispersive X-ray spectroscopy (SEM-EDS) used to detect completely and partially reduced pellets to investigate how density affects the reduction mechanisms. Results illustrate that density affects reduction extent and reduction rate a lot. However, when reaction temperature is 1123 K, density has less influenc on reduction extent. The carbon deposition occurred for high density pellets at 973 K and 1023 K. The reduction process cannot be described by a single rate controlling step. Reduced layer is denser compared with unreduced layer. Reaction at initial stages goes much faster than later stages.

Place, publisher, year, edition, pages
Keyword [en]
Hematite, direct reduction, density, carbon deposition, reduction mechanism.
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-100933OAI: diva2:545942
Available from: 2012-09-12 Created: 2012-08-21 Last updated: 2012-09-12Bibliographically approved

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Master thesis--Dongchen(1829 kB)1582 downloads
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