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Acta Metall Sin  1963, Vol. 6 Issue (2): 121-130    DOI:
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ACTIVITY OF CaO IN LIQUID CaO-SiO_2 AND CaO-Al_2O_3-SiO_2 SLAGS
CHOU YUAN-HSI;CHAO PENG-NIAN;TSAO CHAO-MING Institute of Metallurgy;Academia Sinica
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CHOU YUAN-HSI;CHAO PENG-NIAN;TSAO CHAO-MING Institute of Metallurgy;Academia Sinica. ACTIVITY OF CaO IN LIQUID CaO-SiO_2 AND CaO-Al_2O_3-SiO_2 SLAGS. Acta Metall Sin, 1963, 6(2): 121-130.

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Abstract  A new method,based on the carbothermic reduction of lime,has been devised forthe direct determination of the activity of lime in liquid blast-furnace-type slags.Thesuccess of the method depends upon the proper choice of the solvent metal to lower thechemical potential of calcium in the melt.Owing to the expected very small activity co-efficient of calcium in dilute solutions in tin,the reactionCaO(in slags)+C=Ca(in tin)+CO.has been studied with a view to evaluating activities of lime in liquid CaO-SiO_2 andCaO-Al_2O_3-SiO_2 slags.The activity values in the CaO-SiO_2 system have been used toderive silica activities through the Gibbs-Duhem relationship.The shape of the activitycurves is briefly discussed on the basis of a statistical mechanical model.It has been found from the results on the ternary system that the activity of lime isincreased by the presence of 10% alumina in the slags for the entire basicity range underinvestigation.An explanation based on the ionic constitution of slags is offered for thisbehaviour of alumina.
Received:  18 February 1963     
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