Print Email Facebook Twitter Prediction of density and volume variation of hematite ore particles during in-flight melting and reduction Title Prediction of density and volume variation of hematite ore particles during in-flight melting and reduction Author Chen, Z. (TU Delft (OLD) MSE-3) Qu, Ying xia (Northeastern University) Zeilstra, Christiaan (Tata Steel) Van Der Stel, Jan (Tata Steel) Sietsma, J. (TU Delft Materials Science and Engineering; TU Delft (OLD) MSE-3) Yang, Y. (TU Delft (OLD) MSE-3) Department Materials Science and Engineering Date 2019 Abstract HIsarna is a promising ironmaking technology to reduce CO 2 emission. Information of phase transformation is essential for reaction analysis of the cyclone reactor of the HIsarna process. In addition, data of density and volume of the ore particles are necessary for estimation of the residence time of the particles in the cyclone reactor. Phase transformation of iron ore particles was experimentally studied in a drop-tube furnace under simulated cyclone conditions and compared with thermodynamic calculation. During the pre-reduction process inside the reactor, the mineralogy of iron ore particles transforms sequentially from hematite to sub-oxides. The density changes of the particles during the melting and reduction can be predicted based on the phase composition and temperature. Therefore, density models in the studies were evaluated with reported experimental data of slag. As a result, a more reliable density model was developed to calculate the density of the formed slag containing mainly FeO–Fe 2 O 3 . The density and volume of the partially reduced ore particles or melt droplets were estimated based on this model. The results show that the density of the ore particles decreases by 15.1% at most along the progressive reduction process. Furthermore, 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 expansion. It would result in corresponding variation in velocity of the ore particles or melt droplets during the flight inside the reactor. Subject Hematite ore particleHIsarnaIronmaking processOre density changePhase transformationSmelting reduction To reference this document use: http://resolver.tudelft.nl/uuid:f3d27996-7301-4063-ba82-331d609f0908 DOI https://doi.org/10.1007/s42243-019-00265-3 ISSN 1006-706X Source Journal of Iron and Steel Research International, 26 (12), 1285-1294 Part of collection Institutional Repository Document type journal article Rights © 2019 Z. Chen, Ying xia Qu, Christiaan Zeilstra, Jan Van Der Stel, J. Sietsma, Y. Yang Files PDF Chen2019_Article_Predicti ... lumeVa.pdf 1.7 MB Close viewer /islandora/object/uuid:f3d27996-7301-4063-ba82-331d609f0908/datastream/OBJ/view