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The excess [gamma] properties of metal cations (Cu⁺) in PbO-Cu₂O-SiO₂

University of British Columbia

Activities of Cu₂O in PbO - Cu₂O - SiO₂ slags have been measured by a slag-metal equilibrium. Excess properties of the cation were established from Temkin's rule using the measured Cu₂O and aO²⁻ data. Lnɤ Cu⁺ values were found to be directly proportional to the activities of silicate anions along lines of constant NPb²⁺/NCu⁺ ratio. Also, it was observed that the excess properties of the copper cation increase with cation dilution. These properties are generally characteristic of all metal cations in PbO-Cu₂O-SiO₂ and CaO-FeO-SiO₂ slags. A method has been devised for interpolation and extrapolation of measured activity data in ternary silicate slag systems. Integration of the cationic form of the Gibbs-Duhem equation in the PbO-Cu₂O-SiO₂ system has shown Toop's method of calculating ternary oxygen ion activities to be satisfactory. Agreement of the measured-cationic data with other data in the PbO-Cu₂O-SiO₂ system is good. The established cationic excess properties are structurally interpretable indicating that anionic and cationic activities, as predicted from ionic theory, are reasonable.

Text

2011-12-13

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http://hdl.handle.net/2429/39646

Metals and Materials Engineering

University of British Columbia

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