Original scientific paper

Thermodynamic activities of V₂O₃, MnO, and FeO In quaternary system V₂O₃ - FeO - SiO₂ – MnO

D. Grigorova orcid.org/0000-0001-8440-4368 ; University of Chemical Technology and Metallurgy, Sofia, Bulgaria
R. Paunova ; University of Chemical Technology and Metallurgy, Sofia, Bulgaria

Abstract

The activities of FeO, V₂O₃ and MnO in quaternary systems V₂O₃-FeO-SiO₂-MnO have been investigated. Investigation of thermodynamic data of this slag system, aims extracting vanadium, from the waste and obtaining Mn-V alloy with potential industrial application. The oxygen potential in the systems was determined by the Electromotive force (EMF) method. The solid electrolyte was ZrO₂ (CaO), and the reference electrode - a mixture of Mo/MoO2 was used as a galvanic cell. The Gibbs free energy and the activity were calculated based on experimentally obtained oxygen potential. On the basis thermodynamics of the calculations, the experimental results revealed the possibility of obtaining a complex alloy from the manganese concentrate and the vanadium waste catalyst.

Keywords

thermodynamic; activity; quaternary systems V₂O₃ - FeO - SiO₂ - MnO; EMF method

Hrčak ID:

224744

URI

https://hrcak.srce.hr/224744

Publication date:

1.1.2020.

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