ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Thermodynamic Behavior of Carbon in Molten Slags
Joo Hyun ParkDong Joon Min
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2000 Volume 40 Issue Suppl Pages S96-S100


The solubility of carbon in the MO-B2O3 (MO=CaO, BaO, and Na2O) and CaO-RO (RO=SiO2 and Al2O3) slags at high temperatures was measured to understand the thermodynamic behavior of carbon in molten slags. The solubility of carbon as a function of the composition of slags shows a minimum value, indicating that carbon dissolves by different mechanisms in the acidic and basic slags, respectively. The infrared spectra measurements indicate that the B-C bond is about 1150 and 1140 cm-1 in the acidic region of the CaO-B2O3 and Na2O-B2O3 slags; hence, the incorporation of carbon into the borate network is confirmed qualitatively. The dissolution of carbon and nitrogen into the slags shows a similar behavior in the B2O3-bearing slags, while different behavior is shown in the CaO-SiO2 and CaO-Al2O3 slags, based on the relationship between carbide capacity and nitride capacity.

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