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Prediction of density and volume variation of hematite ore particles during in-flight melting and reduction

Journal of Iron and Steel Research International 2019年第12期26卷 1285-1294页

作者： Zhi-yuan Chen Ying-xia Qu Christiaan Zeilstra Jan Van Der Stel Jilt Sietsma Yong-xiang Yang Department of Materials Science and Engineering Delft University of TechnologyDelft 2628 CDThe Netherlands School of Metallurgical Engineering Northeastern UniversityShenyang 110819LiaoningChina Tata Steel Europe Ijmuiden 1970 CAThe Netherlands

HIsarna is a promising ironmaking technology to reduce CO2 *** of phase transformation is essential for reaction analysis of the cyclone reactor of the HIsarna *** addition,data of density and volume of the ore particles are necessary for estimation of the residence time of the particles in the cyclone *** transformation of iron ore particles was experimentally studied in a drop-tube furnace under simulated cyclone conditions and compared with thermodynamic *** the pre-reduction process inside the reactor,the mineralogy of iron ore particles transforms sequentially from hematite to *** density changes of the particles during the melting and reduction can be predicted based on the phase composition and ***,density models in the studies were evaluated with reported experimental data of *** a result,a more reliable density model was developed to calculate the density of the formed slag containing mainly FeO–*** density and volume of the partially reduced ore particles or melt droplets were estimated based on this *** results show that the density of the ore particles decreases by 15.1%at most along the progressive reduction ***,the model results also indicate that heating,melting and reduction of the ore could lead to 6.63%–9.37%swelling of the particles,which is mostly contributed by thermal *** would result in corresponding variation in velocity of the ore particles or melt droplets during the flight inside the reactor.

关键词： Ironmaking process HIsarna Smelting reduction ore density change Phase transformation Hematite ore particle

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