Thermodynamic Modeling of Iron and Nickel Reduction from B2O3-CaO-FeO-NiO Melts
At present, during solving theoretical and applied problems of metallurgical technologies improving, thermodynamic modeling (TDM) methods are widely used to calculate multicomponent and multiphase systems. However, existing methodology TДM are intended for the balance analysis in the ”closed” systems. The authors of  proposed a technique that allows, using TDMs, to describe metal reduction processes during gas bubbling of multicomponent oxide melts in approximation to “open” real systems. The applicability of the methods is estimated using the example of joint Nickel and Iron reduction modeling in the B2O3-CaO-FeO-NiO system by Carbon monoxide for ”open” and ”closed” systems. The data obtained comparison for ”open” and ”closed” systems show that the consecutive output of products (gas and metal) from working medium promotes achievement of the best parameters for Nickel extraction to alloy and to its residual content in oxide melt. Using this technique, the TДM process of joint reduction of Nickel and Iron in system B2O3-CaO-FeO-NiO by Carbon monoxide in ”open” system was undertaken at various temperatures in the 1273-1773K interval.
Keywords: thermodynamic modeling, ”closed” system, ”open” system, joint reduction, Carbon monoxide, oxide melt, gas bubbling
 Selivanov, E. N., et al. (1991). Deep Oxidized Nickel Ores Reduction of Shaft Furnace Slag Melting. Complex Use of Mineral Raw Materials, issue 3, p. 62.
 Rusakov, M. R. (2000). The Processes of High-Intensity Electric Melting and High-Intensity Depletion of Slag. Transactions: New Processes in the Metallurgy of Nickel, Copper and Cobalt. Moscow: Ore and Metals, pp. 126-138.
 Bystrov, V. P., et al. (2011). Use of the Vanyukov Process for Oxidized Nickel Ores Processing. Non- Ferrous Metals, issue 8-9, pp. 155-158.
 Rusakov, M. R. (1985). Depletion of Slag Melts by Purging with Reducing Gases. Non-Ferrous Metals, issue 3, pp. 40-42.
 Komkov, A. A., Ladygo, E.A. and Bystrov, S.V. (2003). Investigation of the Non-Ferrous Metals Behavior in Reducing Conditions. Non-Ferrous Metals, issue 6, pp. 32-37.
 Fomichev, V. B., et al. (2002). Investigation of Slag Depletion Process by Purging its by Gas Mixtures with Various Partial Oxygen Pressures. Non-ferrous metals, issue 9, pp. 32-36.
 Sohn, H. Y. (2014). Process Modeling in Non-Ferrous Metallurgy. In S. Seetharaman (Ed.), Treatise on Process Metallurgy: Industrial Processes. Oxford: Elsevier Ltd., pp. 701-838.
 Dosmukhamedov, N. K., et al. (2016). Behavior Researching of the Non-Ferrous Metals, Iron and Arsenic during Reductive Depletion of Copper-Rich Slags. International Journal of Applied and Fundamental Research, issue 1(4), pp. 486-491.
 Vusikhis, A. S., et al. (2018). Modeling the Process of Metals Gas Reduction from Multicomponent Oxide Melt in a Bubbled Layer. Butlerov Communications, vol. 55, issue 7, pp. 58-63.
 Vusikhis, A. S., Kudinov, D. Z. and Leontyev, L. I. (2008). Modeling the Kinetics of the Joint Reduction of Iron and Nickel from Multicomponent Oxide Melt with Hydrogen in a Bubbled Layer. Journal of Phys. Chem, vol. 82, issue 11, pp. 2030-2034.