2018 - Sustainable Industrial Processing Summit & Exhibition
4-7 November 2018, Rio Othon Palace, Rio De Janeiro, Brazil
Seven Nobel Laureates have already confirmed their attendance: Prof. Dan Shechtman, Prof. Sir Fraser Stoddart, Prof. Andre Geim, Prof. Thomas Steitz, Prof. Ada Yonath, Prof. Kurt Wüthrich and Prof. Ferid Murad. More than 400 Abstracts Submitted from about 60 Countries.
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    [Oxygen applications for sustainable steelmaking/steel melting]
    Reduction behavior of composite manganese ore-carbon: an analysis
    Reduction behavior of composite manganese ore-carbon: an analysis
    Cyro Takano1; Jose Dabreu2; Ricardo Braga1; Ferry S Belisario Benique3; Flavio Beneduce4;
    1UNIVERSITY OF SAO PAULO, Sao Paulo, Brazil; 2PUC-RIO UNIVERSITY, Rio de Janeiro, Brazil; 3CATHOLIC UNIVERSITY OF RIO DE JANEIRO, Rio de Janeiro, Brazil; 4USP, Sao Paulo, Brazil;
    PAPER: 401/Iron/Plenary (Oral)
    SCHEDULED: 14:25/Mon./Mar Azul (50/1st)



    ABSTRACT:
    There is a great diversity of minerals containing manganese. The important ones are psilomelane (Ba,H<sub>2</sub>O)<sub>2</sub>Mn<sub>5</sub>O<sub>10</sub>) pyrolusite (MnO<sub>2</sub>), criptomelane (K(Mn<sup>++++</sup>,Mn<sup>++</sup>)<sub>8</sub>O<sub>16</sub>), rhodochrosite (MnCO<sub>3</sub>) and some ore with high content of iron oxides. For ferro-manganese production, the accepted reduction steps are gas/solid reaction to reduce higher oxides to lower ones (MnO<sub>2</sub>> MnO and Fe<sub>2</sub>O3>FeO) and at temperatures higher than around 1000°C gas/solid, solid/solid, liquid/solid and liquid/liquid reactions. The liquid/liquid and metal/slag reactions are the predominant ones at conventional Smelting Electric Furnace, for effective reduction of MnO>Mn at temperatures (~>1300°C) and it involves slag formation, dissolution of MnO in the slag, reduction of Mn++ in slag by carbon embebeded by slag or by slag/metal reaction by carbon dissolved in liquid Fe-Mn(MnxCy). The result is low production rate due to slow reactions. This paper analyzes some important effects from the characteristics of the manganese ores for ferromanganese production, such as: gangue and mineral compositions regarding the components that may form liquid phase during high temperature processing, impairing the rate of reduction of manganese ore-carbon composite. It may conclude that ores with high manganese content and low content of silica, iron oxide, (and others which may form liquid phase-slag at temperatures around 1350/1400°C) are prone to having better reduction behavior and consequently higher productivity and lower energy consumption.

    References:
    1 Braga, R.S., Takano, C., Mourao, M.B. Prereduction of self-reducing pellets of manganese ore. Ironmaking & Steelmaking. London. The Institute of Materials, Minerals and Mining. 2007, v.34, no. 4, pp. 279-284. ISSN: 0301-9233.<br />2 Benique, F.B., DAbreu, J.C., Kohler, H.M., Rodrigues, R.N. Auto-reducao carbotermica de aglomerados de oxidos de manganes. Proc. 7th Japan-Brazil Symposium on Dust Processing-Energy-Environment in Metallurgical Industries. ABM-Sao Paulo- Brazil Sept 2008. pp 1-10