Viscosity: FeO-CaO-Al2O3-SiO2
It is beneficial to get the viscosity for coal ash and fluxed coal slags at the tapping temperatures of entrained flow gasifiers. In the work by Hurst et al. [1999/2000Hur], slags derived by fluxing Australian bituminous coal ashes with limestones have properties that may be approximated by the FeO-CaO-Al2O3-SiO2 system.
In this example using the TCS Metal Oxide Solutions Database (TCOX), viscosity-temperature curves were determined for a range of slag compositions at the 5 and 15 mass% FeO levels.
![The solid lines represent the calculated viscosities of the FeO-CaO-Al2O3-SiO2 system, which are compared with the experimental data by Hurst et al. [1999 and 2000].](../../../resources/images/thermophysicalprop/tcox_viscfeoslag.png "The solid lines represent the calculated viscosities of the FeO-CaO-Al2O3-SiO2 system, which are compared with the experimental data by Hurst et al. [1999 and 2000].")
Figure 1: The solid lines represent the calculated viscosities of the FeO-CaO-Al2O3-SiO2 system, which are compared with the experimental data by Hurst et al. [1999/2000Hur].
References
[1999Hur] H. J. Hurst, F. Novak, J. Patterson, Viscosity measurements and empirical predictions for some model gasifier slags, Fuel. 78, 439–444 (1999).
[2000Hur] H. J. Hurst, J. Patterson, A. Quintanar, Viscosity measurements and empirical predictions for some model gasifier slags—II, Fuel. 79, 1797–1799 (2000).