Thermodynamic Properties and Viscosities of CaO-SiO{sub 2}-MgO-Al{sub 2}O{sub 3} Slags

Journal Article · Mon Apr 15 04:00:00 EDT 2019 · Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science

DOI:https://doi.org/10.1007/S11663-018-1490-6· OSTI ID:22933671

Jiao, Ke-Xin; Chang, Zhi-Yu ^[1]; Chen, Chunlin ^[2]; Zhang, Jian-Liang ^[1]

---

1. University of Science and Technology Beijing, School of Metallurgical and Ecological Engineering (China)
2. CSIRO Mineral Resources (Australia)

In this work, the effects of Al{sub 2}O{sub 3}, basicity, and MgO/Al{sub 2}O{sub 3} ratio on the heat capacity, enthalpy change, and viscosity of CaO-SiO{sub 2}-MgO-Al{sub 2}O{sub 3} slags at 1773 K, 1823 K, and 1873 K (1500 °C, 1550 °C, and 1600 °C) were investigated. The heat capacity of the slag increased with increasing Al{sub 2}O{sub 3}, basicity, and MgO/Al{sub 2}O{sub 3} ratio in the experimental temperature range. The enthalpy change increased with increasing Al{sub 2}O{sub 3} content and MgO/Al{sub 2}O{sub 3} ratio, and decreasing basicity. Under the fixed heat quantity of the slag, the addition of Al{sub 2}O{sub 3} would result in a decrease of slag temperature and increase of slag viscosity. The effect of decreasing temperature on the viscosity was more significant than increasing Al{sub 2}O{sub 3} content. Increases of slag basicity led to the increased slag temperature and the decreased viscosity which was due to the increased slag temperature. The viscosity change rate with different temperatures was more pronounced than that of different slag compositions. The change of the slag temperature at fixed heat quantity would be opposite due to different expressions of MgO/Al{sub 2}O{sub 3} ratio. In addition, when the heat decrement of the slag was fixed, the slag temperature rose first with the increase of MgO/Al{sub 2}O{sub 3} ratio and then decreased, while the viscosity decreased gradually. The viscosity fluctuation caused by different heat decrements reduced as well with increasing MgO/Al{sub 2}O{sub 3} ratio.

• OSTI ID: 22933671
• Journal Information: Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science, Journal Name: Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science Journal Issue: 2 Vol. 50; ISSN MTBSEO; ISSN 1073-5615
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
CALCIUM OXIDES
ENTHALPY
MAGNESIUM OXIDES
SILICON OXIDES
SLAGS
SPECIFIC HEAT
TEMPERATURE RANGE
THERMODYNAMICS
VISCOSITY