THERMAL-CONDUCTIVITY, THERMAL-DIFFUSIVITY, AND SPECIFIC-HEAT OF SLAGSCONTAINING IRON-OXIDES

The thermal conductivity, thermal diffusivity, and specific heat of Fe 2O3-SiO2-CaO synthetic slags have been determined using the hot strip method. Measurements were carried out on three samples having differen t compositions over a wide temperature range (300-1600 K). At temperat ures lower than 1200 K, the thermal conductivities ranged between 1.5 and 2.2 W m-1 K-1, but above 1200 K decreased markedly with increasing temperature. The thermal diffusivities were constant, about 5 x 10(-7 ) M2 S-1, at lower temperatures and decreased with increasing temperat ure above 1200 K. The specific heat was found to increase monotonicall y with increasing temperature. The relative magnitudes of the contribu tions to heat transfer from lattice and radiation conduction in slags containing Fe2O3 are compared. The coordination of Fe3+ ions in slags is also discussed.