Application of different models for the prediction of the kinetics of direct reduction of natural iron ores
(English)Manuscript (preprint) (Other academic)
Simulation of the direct reduction conditions was performed in a laboratory furnace. Lump samples from natural hematite iron ore were reduced by a gas mixture of H2 and CO (H2/CO =1.5) at temperatures 700, 800 and 900°C. The effect of reduction temperature on the reduction degree, reduction rate of samples and carbon deposition were investigated and discussed in this study. The thermo-gravimetric data obtained from the reduction experiments was run in a programme that calculates the solid conversion rate. Also, three models: i) Grain Model (GM), ii) Volumetric Model (VM) and iii) the Random Pore Model (RPM), were used to estimate the reduction kinetics of natural iron ores. It was found that the RPM model result agreed best with the obtained experimental results. Furthermore, it gave better predictions of the natural iron oxide conversion and thereby the reduction kinetics.
natural iron ore, porosity, direct reduction kinetics, solid conversion, reduction rate
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-122457OAI: oai:DiVA.org:kth-122457DiVA: diva2:622458
QS 20132013-05-222013-05-222013-05-31Bibliographically approved