Abstract
As a provision for measuring the thermodynamic data of high MnO slag by equilibrating with liquid copper in the temperature range of hot metal pretreatment, thermodynamics of manganese-oxygen interactions in liquid Cu-Mn alloy were investigated. The liquid alloys containing 0.2-1.0mass% Mn were equilibrated with solid MnO in a molybdenum crucible under an argon atmosphere. The following equations for the interaction coefficient (f O Mn ) were obtained for the range of 0.2-1.0 mass% Mn. log f O Mn = -0.8122-1.27[%Mn] + 0.37[%Mn] 2 at 1 573 K log f O Mn = -0.7536 -1,14[%Mn] + 0.33 [%Mn] 2 at 1 623 K log f O Mn = -0.6189-1.07[%Mn] + 0.37 [%Mn] 2 at 1 673 K Using the above values of log f O Mn , the activities and activity coefficients of MnO in MnO-SiO 2 slag were determined at 1 673 K and examined in comparison with the values reported by other investigators.
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