| Autor: |
Pezzin, Rodrigo de Oliveira, Berger, Anna Paula Littig, Grillo, Felipe Fardin, Junca, Eduardo, Furtado, Henrique Silva, Oliveira, José Roberto de |
| Zdroj: |
Journal of Materials Research and Technology; January-February 2020, Vol. 9 Issue: 1 p838-846, 9p |
| Abstrakt: |
Normally, CaO is used in steel desulfurization in slags from the systems: CaO–CaF2, CaO–Al2O3, and CaO–SiO2. Among these, the CaO–CaF2slags are more efficient. This paper uses computational thermodynamics to study the influence of solid and liquid phases in the efficiency of desulfurizing slags in the CaO–Al2O3system. Desulfurizing slags were prepared to produce steels with sulfur levels below 20ppm. Simulations using computational thermodynamics were made to determine the properties of the slags at 1600°C. The experimental tests were carried out in an induction furnace at 1600°C. The experimental results showed that slags from CaO–Al2O3system can be as efficient as slags from CaO–CaF2system, reaching final sulfur contents lower than 10ppm. The conclusion was that slags containing higher quantities of liquid phase are more efficient. However, the presence of some amount of solid CaO is necessary to keep the liquid phase of slag always saturated in CaO and its activity equal to unity. A Steel Desulfurization Factorwas proposed as an easy way to estimate the desulfurization efficiency. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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