Thermodynamic properties of zinc-rich zinc-aluminum melts |
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Authors: | X Y Yan D E Langberg W J Rankin |
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Affiliation: | (1) Department of Chemical Engineering, G.K. Williams Cooperative Research Centre for Extractive Metallurgy, University of Melbourne, 3052 Parkville, Australia |
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Abstract: | A thermodynamic study of molten zinc-aluminum alloys in the range 450 °C to 650 °C and 0 to 0.43 atom fraction of aluminum
was carried out by the electromotive force (emf) method using the reversible concentration cell W,pure Al |MgCl2-NaCl-KCl-AlCl3| Zn-Al (1),W The activities of aluminum derived from the measured cell potentials show considerable positive deviations from
Raoult's law. The Henry's law constants and the self-interaction parameters of aluminum were obtained from the experimental
data for the dilute solutions. The activities of aluminum extrapolated from the present experimental data agree well with
the data from the literature at 727 °C. The values of relative partial molar enthalpy and entropy are also consistent with
the results obtained by previous authors. The behavior of the α-function for aluminum indicates that the solution behaves
approximately subregularly in the dilute region over the tem-perature range investigated, and regularly for atom fractions
of aluminum greater than 0.1 at temperatures greater than 550 °C. |
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