フラックスによる粗銅の精製 (第2報)

Na₂SO₄系およびCaO-Na₂SO₄系フラックスについて

抄録

Thermodynamic and kinetic studies on the removal of Va elements (As, Sb) from molten copper using a CaO-Na₂SO₄flux were carried out.
The distribution coefficients of As and Sb between the flux and molton copper were obtained at 1473 K. Although the values of As distribution coefficients in a CaO-Na₂SO₄flux were smaller than those in a Na₂SO₃ flux, they were sufficiently high to consider its use as a flux for As in copper refining. The oxygen potential dependence of the As distribution coefficients suggested that the dissolved species of As in the flux was in the pentavalent state.
The removal rates of As and Sb from molten copper were measured at different temperatures and oxygen potentials.