Vusikhis A.S., Leont’ev L.I., Sergeeva S.V.
ABSTRACT
The paper presents the results of thermodynamic modeling of copper smelting slag fuming in Vanyukov furnace by products of methane conversion with oxygen, water vapor and carbon dioxide in the temperature range 1473–1773 K. For this purpose, we used a technique that allows us to describe changes in the compositions of the phases of the studied systems during their barbotage depending on the amount of the injected reducing gas, and is distinguished by the cyclic nature of the calculations with the derivation of the working body composition of the formed gases and the metallic phase. As a result of the calculations, it was found that the process of interaction of gas with melt oxides proceeds in two stages regardless of its composition. The first stage is the reduction of Fe3O4 to FeO, and ZnO to Zn. In this regard, the content of Fe3O4 and ZnO in the melt decreases, and FeO increases. In the second stage metallic iron appears, and the content of iron and zinc oxides decreases. A significant effect of temperature on fuming is shown. As the temperature rises from 1473 to 1773 K, the process intensifies significantly, which is accompanied by a 4-fold decrease in the amount of reducing gas required to achieve close values of zinc extraction. Gas composition weakly influences to the process. It is shown that the most effective reducing agent is the gas obtained by steam conversion of methane, which is stipulated by the minimum costs of its obtaining. The obtained results allow predicting indicators of the fuming process by products of methane conversion and will be useful for creation of new technologies.
KEY WORDS:thermodynamic modeling, reducing, fuming, converted gas, bubbling, oxide melt, Iron, zinc.
DOI: 10.31857/S0235010622050103