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
ISBN:978-1-987820-46-1
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    Self-reduction process for ferroalloys

    Cyro Takano1; Adolfo Zambrano2; Ricardo Braga1; Marcelo Breda Mourao1; Cesar Yuji Narita3; Jose Adilson de Castro4;
    1UNIVERSITY OF SAO PAULO, Sao Paulo, Brazil; 2PONTIFICIA UNIVERSIDAD CATOLICA DEL PERU, Lima, Peru; 3POLYTECHNIC SCHOOL OF THE UNIVERSITY OF SAO PAULO, Sao Paulo, Brazil; 4UFF - FEDERAL FLUMINENSE UNIVERSITY, Volta Redonda, Brazil;
    Type of Paper: Plenary
    Id Paper: 332
    Topic: 3

    Abstract:

    Traditionally the self-reducing process for ironmaking relies on cold bond agglomeration for getting the mechanical strength and the main binder is normally Portland Cement. This binder confers excellent cold strength after curing, but loses it, at high temperatures around above 1173K, aggravated with reduction reactions. This is the main problem of self-reducing processes. This paper analyzes some peculiarities of self-reducing process for production of ferro-alloys, mainly for ferro-manganese and ferro-chromium. The reduction phenomena for ironmakling and ferro-alloys productions are quite different, which may affect negatively or positively the strength at high temperatures and the reduction rate of these carbon-ore composite agglomerates.

    Keywords:

    Composite; Extraction; Process;

    References:

    [1] C Takano, C Y Narita and M B Mourao. Alternatives binders for ore-carbon composite agglomerates: an analysis. Sustainable Industrial Processing Summit, 2016- Dabreu Symposium. Sanya, Hainan Island, China, 5-10 Nov 2016, FLOGEN.
    [2] R. Sah and S. K. Dutta. Effects of Binder on the Properties of Iron Ore-Coal Composite Pellets. Mineral Processing & Extractive Metall. Rev., 31: 2010, p 73–85.
    [3] A. Kasai, Y. Matsui, F.Noma, F. Iwakiri, and M.Shimizu. Cold strength enhancement mechanism of carbon composite iron ore hot briquette. Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan. 2001: p. 313-319.
    [4] A. Kasai, Y. Matsui, K. Miyagawa, Y. Yamagata and M. Naito. Development of carbon composite iron ore hot briquette and basic investigation on strength enhancing mechanism and reducibility. Science and Technology of Innovative Ironmaking for aiming at Energy Half Consumption. MEXT. Tokyo, Japan, 2003, p 119-126.
    [5] C. Man-sheng, L. Zheng-gen, W. Zhao-cai and J. Yagi. Fundamental study on carbon composite iron ore hot briquette used as blast furnace burden. Steel Research International. Vol. 82, no 5, 2011, p 521-528.
    [6] H. Yokoyama, K. Higuchi, T. Ito and A. Oshiro. Decrease in the carbon consumption of a commercial blast furnace by using carbon composite iron ore. ICSTI 6th, 2012, Rio de Janeiro, Brazil, ABM. p 1031-1042.
    [7] C. Y. Narita, M. B. Mourao and C. Takano. Development of composite briquettes of iron ore and coal hardened by heat treatment. Ironmaking and Steelmaking. Vol 42, no 7, 2015, p 548-552.
    [8] S L Moraes and S K Kawatra.. Avaliação do uso de combinações de aglomerantes na pelotização de concentrato de magnetita pela tecnologia de aglomeração em tambor (balling drum). Tecnologia Metalurgica. Materiais e Mineracao. ABM. Sao Paulo, Brazil, v. 8, no. 3, jul.-set. 2011, p. 168-173.
    [9] L Yi, Z Huang, T Jiangb, L Wang and T Qi. Swelling behavior of iron ore pellet reduced by H2–CO mixtures. Powder Technology 269 (2015) 290–295.
    [10] W Zhao-cai, C Man-sheng, L Zhen-gen, C Shuang-yin and X Xiang-xin. Effects of Temperature and Atmosphere on Pellets Reduction Swelling Index. Journal of Iron and Steel Research, Int´l. 2012, 19(10): 07-12, 19.
    [11] J Tao, H Guo-qiang, L Guang-hui, F Xiao-hui and C Zhi-xin. Effect of gangue composition on reduction swelling of iron ore pellets. Iron and Steel. 2007, vol 42, issue (5):7-0.
    [12] C Takano and M B Mourao. Self-Reducing Pellets for Ironmaking: Mechanical Behavior. Mineral Processing and Extrative Metallurgy Review. Taylor and Francis. London, GB, 2003, v.24, no 3-4, pp. 233-252.
    [13] H-C Chuang, W-S Hwang and S-H Liu. Effects of Basicity and FeO Content on the Softening and Melting Temperatures of the CaO-SiO2-MgO-Al2O3 Slag System. The Japan Institute of Metals. Materials Transactions, Vol. 50, No. 6 (2009) pp. 1448-1456.
    [14] C Takano, A P Zambrano, A E A Nogueira, M B Mourao and Y Iguchi. Chromites Reduction Reaction Mechanisms in Carbon-Chromites Composite Agglomerates at 1 773 K. ISIJ International, vol. 47, n° 11, PP.1585-1589, 2007.
    [15] D M Santos, M B Mourao and C Takano. Reaction Rate and Product Morphology in Carbon composite Iron Ore Pellets with and without Portland Cement. Ironmaking & Steelmaking. London. The Institute of Materials, Minerals and Mining. 2010, v.37, no. 5, pp. 334-340 .
    [16] A P Zambrano. Auto-redução e fusão-redução de pelotas auto-redutoras de cromita (Self-reduction and smelting of self reducing chromite pellets). Thesis of Doctorate. Metallurgical and Materials Eng. Dept. The University of São Paulo. São Paulo. Brazil. 2009
    [17] R S Braga. Estudo da Redução de Pelotas Auto-Redutoras de Manganês (Study of the reduction of self-reducinmanganese pellets). Thesis of Doctorate. Metallurgical and Materials Eng. Dept. The University of São Paulo. São Paulo. Brazil. 2005
    [18] I-H Jung, Y-B Kang, S A Decterov and A D Pelton. Thermodynamic evaluation and optimization of the MnO-Al2O3 and MnO-Al2O3-SiO2 systems and applications to inclusion engineering. Metallurgical and Materials Transactions B .35(2):259-268 · January 2004
    [19] W Hofmann, T Vlajcic and G Rath. The rotary hearth furnace direct reduction process – a coal based route to substitute electrical energy in ferro alloys production. INFACON 89. ABRAFE. Sao Paulo – Brazil, 1989, v.2
    [20] A P Zambrano, C Takano, M B Mourão, S Y Tagusagawa and Y Iguchi. High carbon ferro-chromium production by self-reducing process: effects of Fe-Si and fluxing agent additions. ISIJ International, 2011, vol. 51, n° 8, pp 1296-1300.
    [21] McCullough, S Hockaday, C Jhonson and N A Barcza. Pre-reduction and smelting characteristics of Kazakhstan ore samplers. The twelfth International Ferroalloys Congress. INFACON. June 6-9, 2010. Helsinki, Finland, pp 249-262.

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    Cite this article as:

    Takano C, Zambrano A, Braga R, Breda Mourao M, Narita C, de Castro J. Self-reduction process for ferroalloys. 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. 178-193.