| Abstrakt: |
Application of the iron-containing wastes, such as converter production sludge, iron-containing concentrates, mill scale, iron ore-dressing wastes, etc., is one of the promising areas in metallurgy. Development of new resource-saving technologies with application of those waste requires preliminary research and accumulation of the information on the iron reduction. The present work considers the processes of iron reduction under the various conditions. We engaged the thermodynamic simulation method based on search for the entropy maximum. The "Terra" software package (Bauman Moscow State Technical University) is the thermodynamic simulation tool. The "Terra" complex is designed to calculate thermodynamic properties and composition of the phases in the arbitrary system with chemical and phase transformations in the equilibrium state. With this software package, we investigate the iron disoxidation processes by various reduction agents (carbon, manganese, and silicon) in the model thermodynamic systems, and determine the optimal conditions for the temperature and the reducing agent consumption. The paper presents the results on the processes in the equilibrium metal–slag system. We analyzed the equilibrium state of the metal-slag system within the temperature range of 1773–1973 K under the different slag amounts; determined the domains of the oxidation–reduction processes; and assessed the influence of the metal components on the iron oxide reduction from slag to metal. Temperature dependences of the equilibrium system composition are obtained for various metal-to-slag ratios and the optimal conditions for the iron reduction are determined. [ABSTRACT FROM AUTHOR] |
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