Abstract
Laboratory tests of crucibles cut from commercial brick with synthetic slags have been carried out at 1600‡C and the existence of a protective dense magnesia layer has been verified. A mathematical model of the formation of MgO under quasisteady state in the decarburized zone leading to the building of a dense MgO layer has been formulated. This mathematical analysis has helped the interpretation of experimental observations and in deduction of refractory performance in relation to steelmaking operational factors. Optimum combination of temperature and iron oxide activity is, in principle, obtainable based on this model and may be used to explain the variety of lining lives of various steelmaking furnaces. A mechanism of decarburization and an intermittent process of formation and dissolution of a protective dense MgO layer is proposed.
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Kim, S.M., Lu, W.K. Kinetics and mechanism of the formation of dense mgo layer in pitch-bearing magnesite brick during service. Metall Trans B 9, 353–364 (1978). https://doi.org/10.1007/BF02654408
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DOI: https://doi.org/10.1007/BF02654408