The distribution of metals in Pb-Sb ailoy during vacuum distillation was calculated.The composition curve of vapor-liquid phases determined by this work is different from those of. other researchers.The curve intersects the diagonal at C.The compositions of vapor and liquid at C are identical.The antimony content of vapor on the left of C is less than that of liquid,and the vapor on the right-side of C contains more antimony.These characteristics can be applied to the elimination of antimony from crude lead or the elimination of lead from crude antimony.The position of C moves rightwards with temperature increment.The discrepency among the compositions of C suggested by diffrent authors was explained.
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