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Kinetics and mathematical modeling of hydrogen reduction of NiO-WO 3 precursors in fluidized bed reactor
Department of Materials Science and Engineering, Royal Institute of Technology.ORCID iD: 0000-0002-2358-7719
Central Metallurgical Research and Development Institute (CMRDI), Helwan, Cairo.
Indian Institute of Technology (IIT).ORCID iD: 0000-0003-0278-1333
Kungliga tekniska högskolan, KTH, Department of Metallurgy, Royal Institute of Technology, Stockholm, Division of Metallurgy, Department of Materials Science and Technology, Royal Institute of Technology.
2011 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 51, no 9, p. 1383-1391Article in journal (Refereed) Published
Abstract [en]

In the present work, Fluidized bed reduction of NiO-WO 3 precursors was investigated isothermally at temperatures 973-1 273 K. The reaction progress was monitored by analysis of H2O evolved during the reaction process using a gas chromatograph instrument. A theoretical model based on intrinsic chemical reaction rate constants and thermodynamic equilibria was developed to estimate the apparent reaction rate constant for the reduction reaction. In developing the model, the particles are considered to be in a completely mixed condition and gas flow is described as plug flow. The proposed model is also suitable for scale-up calculations. The interfacial chemical reaction model was found to fit the experimental results. The apparent activation energy values of the reduction process at different stages were calculated accordingly. The present investigation proved that the fluidized bed technique can be successfully utilized in bulk production of intermetallics containing W and a transition metal (or a composite material) wherein the process conditions would have a strong impact on the particle size of the end product.

Place, publisher, year, edition, pages
2011. Vol. 51, no 9, p. 1383-1391
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-10982DOI: 10.2355/isijinternational.51.1383Local ID: 9e1273f7-bef4-4ee1-a4ac-b86dd846ca02OAI: oai:DiVA.org:ltu-10982DiVA, id: diva2:983931
Note
Upprättat; 2012; 20121108 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-05-28Bibliographically approved

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