Kinetics of reduction of metal values from fayalite-based slags—Part 2: modelling of idealized slag-cleaning conditions

摘要

The kinetics of the reduction of metal values from fayalite slags containing CuO_(0.5), ZnO, PbO, NiO and SnO into a copper-based metal phase have been subjected to a computer simulation. The simulation relies on the use of a previously developed model for the kinetics of metal-slag-gas reactions that assumes mass-transfer control in all phases. Simulations were performed to examine the effects of changing bulk iron oxide activity, the reducing potential of the gas phase, temperature, the iron content of the copper phase and the metal/slag ratio. The results permit practical conclusions to be drawn with regard to industrial slag-cleaning practice. In its present state of development, however, the model suffers from limitations in terms of thermo-dynamic inputs and the idealization of reaction conditions.