Effect of Density on the Reduction of Fe2O3 Pellets by H2-CO Mixtures
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
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
Hematite, direct reduction, density, carbon deposition, reduction mechanism.
IdentifiersURN: urn:nbn:se:kth:diva-100933OAI: oai:DiVA.org:kth-100933DiVA: diva2:545942