Chromites Reduction Reaction Mechanisms in Carbon-Chromites Composite Agglomerates at 1773K

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概要

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• Fe–Cr–C production is a very high electrical energy consuming process. When self-reducing agglomerates are used, it is expected to decrease up to 10% of this electrical energy. This paper presents the fundamental aspects of the reactions involved in reduction of chromites by use of self-reducing agglomerates. Brazilian chromite containing 41.2% Cr2O3 was mixed with petroleum coke and agglomerated with cement as the binder. The concept of “initial slag” was introduced and it was assumed that this “initial slag” is formed of fluxing agents, coke ash, silica formed, binder and dissolution of only 5% of the gangue from the chromite. This concept is important since the gangue of chromite is composed mainly by refractory oxides (MgO+Al2O3), which are difficult to dissolve into slag. The effects of “initial slag” composition, one with low liquidus temperature (~1700 K) and the other with high liquidus temperature (~1750 K) were investigated. The mixture was pelletized, dried and submitted at the temperature of 1773 K until completion of the reactions and also the fractional reaction as a function of time was determined. The results showed that the pellets in which liquid slag phase was formed at high temperature presented significant better reduction behavior than the pellets in which the liquid slag phase was formed at low temperature. The microscopic analysis showed that a liquid phase was formed but the pellet did not collapse, and indicated that the coalescence of the metallic phase depended on the dissolution of the pre-reduced particles of the chromite into slag.

• 社団法人 日本鉄鋼協会の論文
• 2007-11-15

著者

• IGUCHI Yoshiaki

  Nagoya Institute of Technology

• Zambrano Adolfo

  Metallurgical And Materials Engineering Department Escola Politecnica Of The University Of Sao Paulo

• Mourao Marcelo

  Metallurgical And Materials Engineering Department Escola Politecnica Of The University Of Sao Paulo

• TAKANO Cyro

  Metallurgical and Materials Engineering Department, Escola Politecnica of the University of Sao Paul

• NOGUEIRA Alberto

  Metallurgical and Materials Engineering Department, Escola Politecnica of the University of Sao Paul

• Takano Cyro

  Metallurgical And Materials Engineering Department Escola Politecnica Of The University Of Sao Paulo

• Nogueira Alberto

  Metallurgical And Materials Engineering Department Escola Politecnica Of The University Of Sao Paulo

関連論文

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• Carburized Carbon Content of Reduced Iron and Direct Carburization in Carbon Composite Iron Ore Pellets Heated at Elevated Temperature
• Abnormal Swelling during Reduction of Binder Bonded Iron Ore Pellets with CO-CO_2 Gas Mixtures
• Reduction and Melting Process of Coal Char/Iron Ore Composite Pellet by Heating in Nitrogen
• Chromites Reduction Reaction Mechanisms in Carbon-Chromites Composite Agglomerates at 1773K
• Kinetics of Decomposition and Re-oxidation Resistance of θ- and χ-Iron Carbides at Elevated Temperatures and Influence of Their Formation Conditions
• Carburization Kinetics of Reduced Iron during Its Carbidization in CO-H_2-H_2O-H_2S Mixtures
• Reactions, Coalescence of Reduced Iron Particles, and Liberation of Carbon Particles in Carbon Composite Iron Ore Pellets
• Kinetics of the Reactions in Carbon Composite Iron Ore Pellets under Various Pressures from Vacuum to 0.1MPa
• Sulfur Sorption Rate and Equilibrium Content of Reduced Iron in H_2-H_2S Mixtures
• High Carbon Ferro-chromium Production by Self-reducing Process: Effects of Fe-Si and Fluxing Agent Additions

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