Abstract
Values have been reported in the literature for the Henrian activity coefficient for arsenic in molten copper ranging from 1.45 × 10-4 to 5 × 10-7 at temperatures between 1273 and 1573 K. In this study, that data was reexamined and was found to be in closer agreement than originally reported. The Henrian activity coefficient was found to range from 2.2 × 10-3 at 1273 K to 5.6 × 10-3 at 1373 K. The experimental data indicate that at 0.21 < NAs < 0.30 the activity coefficient γAs can be determined from the following equations: log γAs = -5.58 NCu2+ 1.65(T = 1273 K) log γas = -6.22 NCu/2+ 2.25(T = 1373 K) This study also examined the extent of the disassociation of tetratomic arsenic vapor as As, As2 and As3. The results of the analysis indicate that As2 is the predominant species when arsenic vapor, equilibrated with metallic arsenic at temperatures below 873 K, is heated to temperatures above 1273 K.
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