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Thermodynamic behaviour of carbonate in CaO based slag
Author(s) -
Song Hyo Seok,
Kim Dong Sik,
Rhee Peter Chang Hee,
Min Dong Joon
Publication year - 2002
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.200200011
Subject(s) - carbonate , solubility , dissolution , slag (welding) , chemistry , carbonate ion , inorganic chemistry , mineralogy , materials science , metallurgy , organic chemistry
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 CO 2 gaseous phase and oxygen ion to form carbonate (CO 3 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‐SiO 2 slag changed with CaO content, but that of CaO‐Al 2 O 3 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‐SiO 2 ‐MgO slag. The critical oxygen potential for carbide and carbonate stability was found to be 10‐ 10 bar.