Regular Article

Separation of V-bearing phase from the vanadium slag system utilizing supergravity

College of Materials Science and Engineering, Hebei University of Engineering, Handan, 056038, PR China

^* e-mail: lyj19850518@163.com

Received: 8 June 2020
Accepted: 7 August 2020

Abstract

The crystallization and separation behaviors of the V-spinel phase in the FeO-SiO₂-V₂O₃-TiO₂ system as the main components of vanadium slag were investigated to effectively concentrate and separate vanadium from the vanadium slag. Fine V-spinel precipitates were transformed into large lumps and strip crystals by decreasing the temperature from 1773 K to 1723 K. Ti-spinel phases began to crystallize from the molten slag by further decreasing the temperature to 1673 K. In order to adequately precipitate a single V-spinel phase with suitable grain size in the crystals from the molten slag, the temperature was chosen as 1723 K. With introduction of supergravity technology, the Ti-containing slag melt went through the filter to form the Ti-containing slag, while V-spinel crystals were intercepted by the filter to form the V-enriched slag. Consequently, with G = 700 at 1723 K for 10 minutes, the mass fraction of V₂O₃ was increased from 17.00 wt% before separation to 32.98 wt% in the enriched slag; the recovery ratio of V₂O₃ reached about 86.50%. In addition, the mass fraction of TiO₂ reached about 19.41 wt% in the Ti-containing slag, which could be recycled as a titanium-bearing material in the metallurgical industry.