Systems of metallurgical slags

Fedor (1990), and Fedor et al. (1991). The density, surface tension, electrical conductivity, and viscosity have been measured at the temperature of 1573 K and in a relatively wide concentration range. The density and surface tension were measured by means of the maximum bubble pressure method using a device similar to that described in Section 6.2.2. The viscosity was measured using the rotational method, and the electrical conductivity, by means of the two-electrode method. 

From the theoretical point of view, on the basis of the complex physico-chemical analysis of these melts, considerations of their structure, i.e. the ionic composition was made. Using the multiple linear regression analysis, the equations describing molar volume and the surface tension on composition were obtained. From the individual interaction parameters, the formation of different structural entities in the melts was proposed. 

In Table 2.11 the values of the molar volumes of essential pure oxides CaO, FeO, and Fe203, obtained in the calculation of the molar volume of individual systems are given. The agreement of values obtained from the measurement in independent systems is surprisingly excellent. The calculated values coincide fairly with the literature data. 

For illustration, LiCko and Dandk (1982) published a similar value for the molar volume of CaO at 1873 K, y (CaO) = 18.28 cm mol and Bottinga and Weill (1970) published the following values for the molar volumes of oxides y (CaO)= 16.5cm mol , y (FeO) = 12.8 cm mol and y (Fe203) = 52cm - mol , all at the temperature of 1723 K. The differences may be caused by different temperatures since the molar volume is rather sensitive to temperature. 

---