Abstract
The EMF of an oxygen concentration cell in sulfide melts (matte and white metal) has been measured under a reduced pressure of around 0.5 mmHg at 1200°C by means of a solid-electrolyte cell and the results are presented as a function of the calculated partial pressure of oxygen, together with the EMF of molten slag, blister copper, and the Cu–O system. Zinc in matte affects the EMF to a great extent.
The magnetite contents in matte, white metal, and slag are semi-quantitatively determined by a magnetic method. The amount of SO2 gas liberated during the vacuum treatment is discussed in relation to the difference of magnetite contents before and after the vacuum treatment.
