2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 6: Yagi Intl. Symp. / Metals & Alloys Processing

Editors:Kongoli F, Akiyama T, Nogami H, Saito K, Fujibayashi A
Publisher:Flogen Star OUTREACH
Publication Year:2016
Pages:480 pages
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    Reduction kinetics of in-flight molten hematite particle in the HIsarna process

    Yingxia Qu1; Liyong Xing2; Yongxiang Yang3; Christiaan Zeilstra4; Koen Meijer4; Rob Boom3; Zongshu Zou2;
    1, Shenyang, China; 2NORTHEASTERN UNIVERSITY, Shenyang, China; 3DELFT UNIVERSITY OF TECHNOLOGY, Delft, Netherlands; 4TATA STEEL, IJmuiden, Netherlands;
    Type of Paper: Regular
    Id Paper: 32
    Topic: 3


    The energy and environment issues have been paid more and more attention by the iron and steel making industry. During the past few decades, a number of new breakthrough technologies for iron and steel making have been developed by different countries to achieve a significant reduction in CO2 emission and energy consumption. HIsarna is one of the technologies which belongs to ULCOS (Ultra Low CO2 Steelmaking) program in Europe and aims to cut CO2 emission by 80% per ton of steel with Carbon Capture and Storage (CCS) technology. HIsarna process makes use of coal and iron ore fines directly as raw materials instead of coke and pellet. It combines a melting cyclone and a smelting reduction vessel (SRV) into a single smelting furnace. The fine hematite ore undergoes a series of complex chemical and physical changes while descending in the melting cyclone such as thermal decomposition, gas-solid particle reduction, melting, and gas-molten particle reduction. It has been found that the hematite particles can melt down quickly in the reducing gas when the temperature is higher than 1650K. The objective of this study is to investigate the reduction kinetics of in-flight molten hematite particle at the typical conditions of melting cyclone. The experiments have been carried out by using a high temperature drop tube furnace. The reduction was accompanied by thermal decomposition reaction during the first 210ms. The kinetic analysis showed that the unreacted shrinking core model could be used to characterize the reduction and thermal decomposition process. The activity energy of the gas-molten particle reduction was about 156kJ/mol-1.
    Keywords: HIsarna process, gas-molten particle reduction, thermal decomposition, reduction kinetics, high temperature, fine hematite ore


    CO2; Emissions; Extraction; Furnace; Iron; Melting;


    [1] M. Komatina, and W. H. Gudenau: The sticking problem during direct reduction of fine iron ore in the fluidized bed, MJoM, 11 (2004), 309-328
    [2] J. H. N. Ju´nior, I. J. Cox and J. C. D’Abreu: The Tecnored ironmaking process part I – Competitiveness and pilot development work, Ironmak. Steelmak., 35 (2008), 245-250
    [3] K. Tooru: DIOS smelting reduction ironmaking technology, Energy, 48 (1999), 13-22
    [4] Y. W. Zhong, Z. Wang, X. Z. Gong, and Z. C. Guo: Sticking behavior caused by sintering in gas fluidization reduction of haematite, Ironmak. Steelmak., 39 (2012), 38-44
    [5] W. Peter and B. Christopher: A sectoral approach, agreement and mechanism (SAAM) for the mitigation of greenhouse gas emissions in Japan’s iron and steel industry, Climate Strategies 2011, UK, 2011, available at www.climatestrategies.org.
    [6] Y. Qu, Y. Yang, Z. Zou, C. Zeilstra, K. Meijer and R. Boom: Melting and reduction behaviour of individual fine hematite ore particles. ISIJ Int., 55 (2015), 149-157
    [7] Y. Qu, Y. Yang, Z. Zou, C. Zeilstra, K. Meijer and R. Boom: Thermal decomposition behaviour of fine iron ore particles, ISIJ Int., 54 (2014), 2196-2205.
    [8] Biswas A. K.: Principles of blast furnace ironmaking, Cootha Publishing House, Brisbane Australia, (1981), 74.
    [9] W.M. McKewan, Kinetics of iron oxide reduction, Trans. Met. Soc. AIME, 218 (1962), 2-6
    [10] L. Elliott, S. M. Wang, T. Wall, F. Novak, J. Lucas, H. Hurst, J. Patterson, J. Happ: Dissolution of lime into synthetic coal ash slags, Am. Chem. S., 41 (1996), 686-690
    [11] N. Dogan, G. A. Brooks, and M. A. Rhamdhani: Kinetics of flux dissolution in oxygen steelmaking, ISIJ Int., 49 (2009), 1474-1482
    [12] S. H. Amini, M. P. Brungs, S. Jahanshahi and O. Ostrovski: Effects of additives and temperature on dissolution rate and diffusivity of lime in Al2O3-CaO-SiO2 based slags, Metall. Mater. Trans B, 37B (2005), 773-780
    [13] N. Takeuchi, Y. Nomura, K. Ohno, T. Maeda, K. Nishioka and M. Shimizu: Kinetics analysis of spherical wusitite reduction transported with Ch4 gas, ISIJ Int., 47(2007), 386-391
    [14] Y. H. Han, J. S. Wang, R. Z. Lan, L. T. Wang, X. J. Zuo and Q. G. Xue: Kinetic analysis of iron oxide reduction in gas recycling oxygen blast furnace, Ironmak. Steelmak., 39 (2012), 313-317
    [15] S. Parkash and H. S. Ray: Prediction of reduction kinetics of iron ore under fluctuating temperature conditions, ISIJ Int., 30 (1990), 183-190
    [16] H. Itaya, M. Sato and S. Taguchi: Circulation and reduction behaviour of iron-ore in a circulating fluidized-bed, ISIJ Int., 34 (1994), 393-400

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    Cite this article as:

    Qu Y, Xing L, Yang Y, Zeilstra C, Meijer K, Boom R, Zou Z. Reduction kinetics of in-flight molten hematite particle in the HIsarna process. In: Kongoli F, Akiyama T, Nogami H, Saito K, Fujibayashi A, editors. Sustainable Industrial Processing Summit SIPS 2016 Volume 6: Yagi Intl. Symp. / Metals & Alloys Processing. Volume 6. Montreal(Canada): FLOGEN Star Outreach. 2016. p. 394-405.