Metalurgija (Jan 2020)
Thermodynamic activities of V<sub>2</sub>O<sub>3</sub>, MnO, and FeO In quaternary system V<sub>2</sub>O<sub>3</sub> - FeO - SiO<sub>2</sub> – MnO
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.
