A. S. Vusikhis, E. N. Selivanov, L. I. Leont’ev.
ABSTRACT
To describe the processes of joint reduction of iron and copper from an oxide melt (1273–1773 K) of the B2O3-CaO-FeO-CuO system with carbon monoxide and hydrogen, we used the thermodynamic modeling technique in the approximation to open systems, with fractional introduction of CO (H2) and periodic removal of metal phases and gases from the composition of the working fluid.
The calculations were carried out taking into account the disproportionation of FeO into Fe and Fe3O4. For the considered compositions of the melt, having a FeO/CuO ratio equal to 10, disproportionation of the lower iron oxide and its interaction with CuO allows, at low temperatures, to transfer copper to the metallic state by 20–80%.
The relationships between the contents of iron and copper oxides in the oxide melt, the degrees of their reduction and the composition of the resulting alloy on the temperature and the amount of the introduced reducing agent are revealed. It is shown that the required amount of hydrogen for the reduction of metals to a fixed degree of copper metallization is significantly lower than that of carbon monoxide. The information obtained is useful for predicting thermoextraction processes occurring during the extraction of useful components from nonferrous metallurgy slags.
KEYWORDS
thermodynamic modeling; oxide melt; recovery; gas; hydrogen; carbon monoxide, metal, iron, copper
DOI: 10.31857/S0235010622020104