Thermodynamic behaviour of carbonate in CaO based slag

Hyo Seok Song; Dong Sik Kim; Peter Chang Hee Rhee; Dong Joon Min

doi:10.1002/srin.200200011

Thermodynamic behaviour of carbonate in CaO based slag

Hyo Seok Song, Dong Sik Kim, Peter Chang Hee Rhee, Dong Joon Min

Department of Materials Science and Engineering

Research output: Contribution to journal › Article

Abstract

Carbonate solubility was measured for CaO bearing slag systems at 1600 °C under different thermodynamic conditions by using equilibration techniques. Carbonate solubility increased with activity of (CaO). The reaction mechanism of the carbonate dissolution in slag can be expressed as a reaction between CO₂ gaseous phase and oxygen ion to form carbonate (CO₃^2-). Carbonate capacities of various slags depended not only on oxygen ion but also activity coefficient of carbonate ion. The activity coefficient of carbonate ion in CaO-SiO₂ slag changed with CaO content, but that of CaO-Al₂O₃ slag did not change remarkably. Substitution of MgO by CaO for solubility of carbonate had a similar effect as in the case of carbide in CaO-SiO₂-MgO slag. The critical oxygen potential for carbide and carbonate stability was found to be 10^-10 bar.

Original language	English
Pages (from-to)	433-437
Number of pages	5
Journal	Steel Research
Volume	73
Issue number	10
DOIs	https://doi.org/10.1002/srin.200200011
Publication status	Published - 2002 Oct

All Science Journal Classification (ASJC) codes

Metals and Alloys

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10.1002/srin.200200011

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Song, H. S., Kim, D. S., Rhee, P. C. H., & Min, D. J. (2002). Thermodynamic behaviour of carbonate in CaO based slag. Steel Research, 73(10), 433-437. https://doi.org/10.1002/srin.200200011

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abstract = "Carbonate solubility was measured for CaO bearing slag systems at 1600 °C under different thermodynamic conditions by using equilibration techniques. Carbonate solubility increased with activity of (CaO). The reaction mechanism of the carbonate dissolution in slag can be expressed as a reaction between CO2 gaseous phase and oxygen ion to form carbonate (CO32-). Carbonate capacities of various slags depended not only on oxygen ion but also activity coefficient of carbonate ion. The activity coefficient of carbonate ion in CaO-SiO2 slag changed with CaO content, but that of CaO-Al2O3 slag did not change remarkably. Substitution of MgO by CaO for solubility of carbonate had a similar effect as in the case of carbide in CaO-SiO2-MgO slag. The critical oxygen potential for carbide and carbonate stability was found to be 10-10 bar.",

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AU - Song, Hyo Seok

AU - Kim, Dong Sik

AU - Rhee, Peter Chang Hee

AU - Min, Dong Joon

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