Metall. Res. Technol.
Volume 117, Number 5, 2020
|Number of page(s)||9|
|Published online||10 September 2020|
Separation of V-bearing phase from the vanadium slag system utilizing supergravity
College of Materials Science and Engineering, Hebei University of Engineering,
056038, PR China
* e-mail: email@example.com
Accepted: 7 August 2020
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.
Key words: vanadium slag / V-spinel phase / supergravity separation / concentrate
© EDP Sciences, 2020
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