Counterflow Leaching Technology for Vanadium from Vanadium Pentoxide Hydrometallurgical Production Slurry
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COUNTERFLOW LEACHING TECHNOLOGY FOR VANADIUM FROM VANADIUM PENTOXIDE HYDROMETALLURGICAL PRODUCTION SLURRY U. A. Kologrieva,1 A. I. Volkov,2 P. E. Stulov,3 M. G. Mirakova,4 and D. V. Zinoveev5
UDC 661.888.1
Research is conducted for creating technology for processing hydrometallurgical production of vanadium pentoxide slurries. The technology includes threestage counterflow leaching of vanadium from slurries and hydrolysis of a vanadiumcontaining solution. The V2O 5 content is ≈ 70 wt.% in the resultant concentrate, Keywords: vanadium, waste, vanadium pentoxide, hydrometallurgy, sludge, leaching, concentrate.
Hydrometallurgical production of vanadium pentoxide is characterized by a considerable amount of solid waste formation, i.e., dump slurry, drainage water neutralization deposit. In AO EVRAZ Vanadii Tula there is formation of ≈ 80 thousand tons of slurry materials per year. With respect to vanadium content (≤ 4.5 wt.% V2O 5 ) they are a richer raw material compared with original titanium magnetite ore (0.14 wt.% V2O 5 ) and Kachkanar Mining and Enrichment Combine concentrate (0.60 wt.% V2O 5 ) [1–7]. Currently in AO EVRAZ Vanadii Tula slurry is used as a charge additive in the oxidation stage of firing in a mixture with vanadium converter slag and limestone. Slurry as an iron-containing additive is partly used in the production of clinker for cement, although a large part is stored in slurry dumps and not used for subsequent treatment [2, 4]. Treatment of slurry will make it possible to obtain additional vanadium product, and also reduce the ecological burden connected with storage of this waste, The aim of this work is a study and treatment of vanadium containing slurry from hydrometallurgical production of vanadium pentoxide with preparation of vanadium concentrate. Numerous hydrometallurgical methods have been developed for processing various forms of vanadiumcontaining waste [1, 5, 8-15] intended for treating waste water, solutions of acids ( H 2SO 4 ), alkali (NaOH, NH 4 OH ) or salts ( Na 2CO 3 , NH 4 Cl , (NH 4 )2 CO 3 , NaHCO 3 ) at atmospheric or elevated pressure with the aim of vanadium extraction. During processing of vanadium-containing slurries in order to increase the vanadium concentration in solution successive multistage leaching is required. Leaching of vanadium slurry with alkaline reagents has been studied in detail in [1]. In the present work sulfuric acid is selected as a reagent having the following advantages: the possibility of removing sulfate ions from aqueous solutions with generally available reagents (slaked lime, limestone) that makes 1 2 3 4 5
FGUP I. P. Bardin TsNIIchermet, Moscow, Russia; e-mail: [email protected]. FGUP I. P. Bardin TsNIIchermet, Moscow, Russia; e-mail: [email protected].
FGUP I. P. Bardin TsNIIchermet, Moscow, Russia; e-mail: [email protected].
FGUP I. P. Bardin TsNIIchermet, Moscow, Russia; e-mail: [email protected].
A. A. Baikov Institute of Metallurgy and Materials Science, Moscow, Russia; National Research Technology University MiSIS, Moscow, Rus
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