銅製錬自溶炉への酸素プローブの適用

抄録

Disposable oxygen probes based on the following galvanic cell were applied toa copper flash smelting furnace:
M, M_xO_y/ZrO₂+CaO or MgO/O in Gas, Slag or Matte, where M, M_xO_y means Fe, FeO or Cr, Cr₂O₃. All types of oxygen probes used in this study were applicable to the slag andmatte phases, but not to the gas phase due to the adhesion of the dust to the zirconia surface and the occurrence of the temperature difference at the outer and inner surfaces of zirconia.
Measured oxygen potentials were normalized to 1200°C with respect to the reaction:
4 FeO (1) +O₂(g) =4 FeO_1.5(1).
Normalized oxygen potential was independent of the depth from the slag surface in the matte phase near the slag-matte interface as well as in the slag phase. Furthermore normalized oxygen potentials in theslag and matte phases were almost constant along the plant from the flash furnace to the electric one. These results imply that the metallurgical reactions among copper concentrates, oxygen gas and flux would be completed in the reaction shaft or in thesettler just under the reaction shaft.