Mathematical model of behavior of impurities under the conditions of reducing bubble processing of copper smelting slags

An equilibrium thermodynamic model of the behavior of lead, zinc, and arsenic during the reduction of the bubble depletion of copper smelting slags in a Vanyukov furnace is developed. The influence of the temperature (1250–1400°C), oxidation potential of the system, and amount of the bottom phase on the degree of extraction of impurities into the depletion products is investigated. By the results of our analysis, conclusions are made that allow one to select the optimal mode of depletion, depending on concrete problems. A high recovery of arsenic into alloy, especially upon an increase in the amount of the bottom phase, as well as the possibility of considerable volatilization of zinc (>80%) under the conditions of deep reduction are mentioned. The distribution of lead between the phases is determined to a large extent by the amount of the obtained bottom phase.