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1  I  

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Volume  2017  I   Issue  1

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  Nandy, S.K. ; Das, G.C.
Non-Isothermal Reaction Kinetics Study of MgO-C Refractories with Added Low-Ash Content Graphite
Refractories Manual (2017) 53-57
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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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