<報文>高炉内のアルカリと硫黄の挙動に関する熱力学的考察

概要

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For the purposes of further understanding of the formation mechanism of the softening-melting zone in the blast furnace, the behaviour of alkalis and sulfur in the furnace was analyzed on the basis of the available knowledge accumulated to date concerning the thermodynamic data, information about the inside of the furance obtained at the time of dissection of blast furnaces, and the results of sensor survey of the furnace. Under the assumptions that the oxygen partial pressures are equal to the equilibrium value of Fe and FeO at the temperatures below 900℃, the Boudouard equilibrium above 1400℃, and at the in-between temperatures becomes intermediate values, and that all of the sulfur in the gas and alkalis are in the form of H_2S and K compounds, respectively, it was concluded that the sulfur in the condensed state might exist in the form of alkali sulphide at the temperatures below 950℃, and iron sulphide as one of the components of liquid slag would be more stable at the temperatures higher than 1250℃. Because of uncertainty of the origin of alkalis and of the low reaction rate, the amount of alkalis obtained in the upper shaft of the furnace could be much larger than the value in the gas phase evaulated by thermodynamic calculations.
東北大学の論文
1977-03-30