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Synopsis : Chemical affinities of the transfer reactions of Si, Mn, S, and Fe between slag and pig iron in the blast furnace (ASiO2, AMnO, As and AFeO) were calculated from oxygen potential (PO2) and temperature of slag and pig iron and their compositions. The PO2 and temperatures were measured by using oxygen con centration cells for slag and pig iron during tapping from the furnace. The following results were ob tained; 1) PO2 in pig iron was larger than that in equilibrium with C and CO gas and thus, oxygen in pig iron was supersaturated. 2) PO2 in slag was one order of magnitude larger than that in pig iron. This Po2 was equal to that in equilibrium with pig iron and FeO in slag. 3) Because ASiO2<0 and As<0, SiO2 in slag could not be reduced and pig iron could not be desulfurized by slag. Because AMno•¬0 , Mn and MnO in slag would be in equilibrium. 4) The magnitude of Asio2 depended on the characteristics of each of the three blast furnaces examined. 5) The content of FeO in slag could be estimated from PO2 and tem perature in slag by using oxygen concentration cells for slag.

Oxygen Potentials in Liquid Pig Iron and Slag and Analysis of Reactions in Blast Furnace by Means of Affinities in the Reactions