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Non-Isothermal Reaction Kinetics Study of MgO-C Refractories with Added Low-Ash Consent Graphite

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Interceram - International Ceramic Review

Abstract

Magnesia-carbon (MgO-C) is widely used in metallurgical furnaces due to its excellent slag thermal shock and corrosion resistance properties. Carbon is non-wettable by slag, which protects MgO, but oxidises in the presence of oxygen. An experiment was undertaken to investigate the oxidation resistance of MgO-C in non-isothermal conditions through evaluation of kinetic laws. MgO-C samples with 2,8% ash content graphite and resin binder were prepared and their oxidation behaviour with respect to weight loss was determined in a specially designed furnace. Samples were fired from 700 to 1400°C at heating rates of 3, 5, 7 and 9 K per minute. Their continuous weight loss was measured at 50 K intervals. In order to find the mechanism(s) associated with oxidation of MgO-C samples, a reduced time ‘∅’ plot analysis was carried out for the samples. For all temperatures and samples, the initial oxidation mechanism was observed to obeya chemical reaction-controlled second order chemical mechanism followed by diffusion processes at higher temperatures.

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Authors and Affiliations

  1. R & D Centre for Iron & Steel (Steel Authority of India Ltd.) Doranda, Ranchi-834002, Jharkhand, India

    S. K. Nandy

  2. Department of Metallurgical & Material Engineering, Jadavpur University, Kolkata-700032, West Bengal, India

    G. C. Das

Authors
  1. S. K. Nandy
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  2. G. C. Das
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Correspondence to S. K. Nandy.

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Nandy, S.K., Das, G.C. Non-Isothermal Reaction Kinetics Study of MgO-C Refractories with Added Low-Ash Consent Graphite. Interceram. - Int. Ceram. Rev. 66, 53–57 (2017). https://doi.org/10.1007/BF03401230

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  • DOI: https://doi.org/10.1007/BF03401230

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