Metall. Res. Technol.
Volume 113, Number 5, 2016
|Number of page(s)||11|
|Published online||20 June 2016|
Effect of Basicity, Al2O3 and MgO content on the softening and melting properties of the CaO-MgO-SiO2-Al2O3 high alumina quaternary slag system
Department of Metallurgical and Materials Engineering Rourkela, National Institute of Technology, 769008 Rourkela, India
Received: 26 November 2015
Accepted: 4 March 2016
The flow characteristic temperatures of the selected quaternary CaO-MgO-SiO2-Al2O3 slags have been experimentally measured by performing softening and melting tests using a high temperature microscope in accordance with German standard 51730. An effective statistical model is developed through constructing empirical equations by regression analysis method to predict Softening temperature (ST), Hemispherical temperature (HT), and Flow temperature (FT) based on Al2O3 (25%–30%) content, CaO/SiO2 (C/S ratio: 0.9–1.4), and MgO (4%–12%) content. The effect of basicity, MgO and Al2O3 content on characteristic temperature are also studied. FactSage 6.4 data base is used to calculate liquidus temperature of the above quaternary slags and compared with the experimental and regression results. The experimental results show that, increase in Al2O3 content increases ST and HT while decreases FT of the slags. The ST, HT and FT increase with increase in C/S ratio. Increase in MgO content decreases both ST and HT while increases FT of the slags. The liquidus temperature obtained from FactSage 6.4 are found to correspond well with the experimental and regression data. Under the range of composition examined, a high Al2O3 (30%) and high C/S ratio (1.4) coupled with low MgO (4%) content is beneficial for the blast furnaces running with high Alumina slags, as it ensures the formation of a short slag.
Key words: Softening temperature / high temperature microscope / short slag / regression analysis
© EDP Sciences 2016
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