Anais do Congresso Anual da ABM

Título

ISO-VISCOSITY CURVES FOR CAO-SIO2-AL2O3-MGO STEELMAKING SLAGS AT HIGH TEMPERATURE

Autoria

Pereira, Augusto Lachini; Rocha, Vinicius Cardoso da; Bielefeldt, Wagner Viana; Vilela, Antônio Cezar Faria

DOI

10.5151/2594-5327-33667

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Resumo

 

A minor change in the chemical composition and temperature affects the slag viscosity, which has a great extent of the physical properties in regarding refining slags. Optimizing those parameters may affect the steel cleanliness. The viscosity measurement process is considered expensive, so the cost-effectiveness does not favor the measures at high-temperatures. Alternatively, it is possible to apply mathematical models or thermodynamic softwares to obtain viscosities for a given range of chemical composition and temperature of slags. The present work contemplates a validation of the experimental data, collected in the literature, with a calculated data and proposes an accurate representation of iso-viscosity curves applied for secondary steelmaking slags, covering the composition ranges: 0–100 wt.% CaO, 0–80 wt.% SiO2, 0–77 wt.% Al2O3 and 0–15 wt.% MgO (CSAM) system at 1500ºC. The viscosity representation fields include fully liquid and a partially liquid slags in the CSAM system and the viscosities were calculated using the FactSage 7.2 (for Liquid Phase) and the Roscoe-Einstein equation (for Phase mixture) for a total of 5976 slags. The preliminary results indicated that there is a great convergence between the calculated and experimental viscosities data, promoting an efficient approximation of the iso-viscosity curves for the CSAM slag system in the high-temperatures.

Palavras-chave

Viscosity; Steelmaking slags; Computational thermodynamics; FactSage 7.2.