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The effect of MgO, TiO 2 , or Fe 2 O 3 on the viscosity of 40CaO-40SiO 2 -20Al 2 O 3 (mass pct) slags has been measured by the rotating crucible viscometer. Viscosity of these quaternary slags decreased with an increase in the content of additive oxide. At the same content of additive oxide, the viscosity decreases from MgO, TiO 2 to Fe 2 O 3 . In addition, the effect of SiO 2 or Al 2 O 3 on the viscosity of 26.1CaO-73.9Fe 2 O 3 (mass pct) (CF) and 14.9CaO-85.1Fe 2 O 3 (mass pct) (CF 2 ) slags has been measured. Viscosity of calcium ferrite slags increased with increasing SiO 2 or Al 2 O 3 content. Al 2 O 3 was found to be more effective for increasing the viscosity at the same content of the additive oxide.

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Synopsis:The rate of dissolution of CaO into liquid slag was determined by measuring the decrease of diameter of rotating CaO cylinder dipped in CaO-SiO2-Al2O3 or FeO-CaO-SiO2 slag and the penetration of slag was examined. Also, the distribution of components in liquid slag adjacent to the solid-liquid interface was examined by the XMA technique.The rate of dissolution increased with temperature and with rotating speed of the cylinder and was expressed by the rate equation derived from the assumption that the rate was controlled by mass transport in the boundary layer of liquid slag. The dissolution rate into liquid slag containing FeO was several times greater than that into slag without FeO, bacause of the difference of physical properties of slag and, probably, of the difference of the mode of 2CaO.SiO2 formation.Slag components penetrated into solid CaO were mainly Al2O3 and FeO and the SiO2 content was very little. This may be explained by the formation of Al2O3 or FeO rich slag layer between solid GaO and 2CaO.SiO2 film.