Abstract
A transpiration method was used to evaluate the Henrian activity coefficient of As (γAso) in Cu-Fe mattes and white metal. Values for the activity coefficient of As (γAs) have been evaluated as a function of the Cu/Fe molar ratio from 1 to ∞, as a function of the sulfur deficiency (defined as SD=Xs−1/2XCu−XFe, where Xi is the mole fraction of the ith species) from −0.02 to +0.02 and at temperatures between 1493 and 1573 K. The activity coefficient for arsenic in the matte was found to have a weak dependence on both temperature and the Cu/Fe molar ratio, but a strong dependence on SD. Analysis of γAs as a function of the trace-element concentration reveals that the activity coefficient is highly dependent on the As content, even at trace concentrations where Henrian behavior is expected. That dependency is attributed to uncertainty in the reported value of the saturation pressure of monatomic arsenic (PAso) and highlights problems in comparing results and specifying Henrian values for the activity coefficient. A method is presented whereby the impact of PAso on computed values of γAs is significantly reduced to obtain an approximate Henrian value of the activity coefficient.
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