| The distribution behaviors of iron, cobalt, lead, tin, silver and gold between copper and matte phases were investigated at two different temperatures within 1400-1500 K. For iron, experimental conditions covered the ranges from dilute solution of iron to the matte saturated with solid iron. For other elements experiments were at 0-11% iron, 0.009-1.8% lead, 0.024-0.256% cobalt, 0.016-0.030% tin, 0.072-0.127% silver, and 0.002-0.004% gold in the matte.;From considerations of matte-metal equilibria, activity coefficients of FeS, PbS, CoS, SnS, AgS(,0.5), and Au in copper-saturated matte were calculated. Calculated values of activity coefficients were correlated with temperature and matte composition.;The following equations express the activity coefficients at infinite dilution: (1) 1n (gamma)(,FeS)(DEGREES) = 2770/T - 2.187; (2) 1n (gamma)(,PbS)(DEGREES) = 2485/T - 3.488 - 0.32 N(,FeS); (3) 1n (gamma)(,CoS)(DEGREES) = 3240/T - 3.030; (4) 1n (gamma)(,SnS)(DEGREES) = -4840/T - 0.155; (5) 1n (gamma)(,AgS(,0.5))(DEGREES) = -980/T - 0.170 + 0.21 N(,FeS); (6) 1n (gamma)(,Au)(DEGREES) = -7620/T + 7.25.;Measured values of the distribution coefficients were correlated with temperature and matte composition. Distribution coefficients at infinite dilution of iron, lead, cobalt, tin, silver, and gold were obtained from these measurements. Variation in iron content of the copper phase is characterized by linearity for 0-2% iron, and a sharp increase near the matter composition saturated with solid iron. Minor amounts of cobalt, lead, tin, silver, and gold have negligible effects on the distribution coefficient of iron. The distribution coefficient of lead increases with a decrease in temperature and an increase in lead content of the matte. With an increase in iron content of the matte, distribution coefficients of cobalt, tin, lead, and silver increase, but the distribution coefficient of gold decreases. Nernst distribution law is obeyed for all the six elements in dilute solutions. |
