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Erschienen in:
01.12.2011
The Thermodynamic Behavior of Copper in the CaO-B2O3 and BaO-B2O3 Slag System
Erschienen in: Metallurgical and Materials Transactions B | Ausgabe 6/2011
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Abstract
The Cu solubility was measured in the CaO-B2O3 and BaO-B2O3 slag systems to understand the dissolution mechanism of Cu in the slags. The Cu solubility had a linear relationship with oxygen partial pressure in the CaO-B2O3 slag system, which corresponds with previous studies. Also, the Cu solubilities in slag decreased with increasing the slag basicity, which value of slope was close to –0.5 in logarithmic form. From the results of experiment, the Cu dissolution mechanism established as follows:To compensate the effects of oxygen partial pressure and chemical potential of Cu in alloy on the Cu solubility of slag, the concept of cuprous capacity was suggested as follows:The cuprous capacity showed decreasing tendency as the slag basicity increased in the B2O3 bearing slags as well as in CaO-SiO2-Al2O3(Satd.) and FeO-Fe2O3-SiO2(Satd.) slag systems. It is suggested that the proposed dissolution mechanism could be available in various slag systems.
$$ {\text{Cu}} + \frac{1}{4}{\text{O}}_{2} = {\text{Cu}}^{ + } + \frac{1}{2}{\text{O}}^{2 - } $$
$$ C_{{\rm Cu^{ + } }} = \frac{K}{{f_{{\rm Cu^{ + } }} \cdot a_{{\rm O^{2 - } }}^{\frac{1}{2}} }} = \frac{{({\text{mass pct Cu}})}}{{a{}_{\rm Cu} \cdot p_{{\rm O_{2} }}^{\frac{1}{4}} }} $$