DISTRIBUTION EQUILIBRIA OF MINOR ELEMENTS BETWEEN LIQUID COPPER AND CALCIUM FERRITE SLAG.

Abstract

The distribution of Ag, Co, Ni, Zn, Sn, Pb, As, Sb and Bi was measured at 1523 K under controlled Co-CO//2 atmospheres. The distribution ratios were plotted against the oxygen potential and compared with those obtained for silicate slag. The increasing content of CaO in ferrite slag results in an increase in the distribution ratio for As or Sb but a decrease in the ratio for Pb. The effects of composition changes in the alloy phase and the temperature dependence on distribution ratios were evaluated thermodynamically. A mono-nuclear atom base expression is reasonable to express the oxide form dissolved in the slag. From the iron content in a Cu-X alloy, the interaction parameters between Fe and X in liquid copper are derived.