Analysis of Hydrometallurgical Methods for Obtaining Vanadium Concentrates from the Waste by Chemical Production of Vanadium Pentoxide

Abstract

The paper describes hydrometallurgical methods to recycle wastes of vanadium pentoxide chemical fabrication. Sludges containing a significant amount of V2O5 can be considered as an additional source of raw materials for vanadium production. We studied the one-stage leaching method using various iron-based reductants for converting V5+ to V4+ in a solution allowing to precipitate V when its concentration in the solution is low. As a result of the reduction leaching with further precipitation, we obtained concentrates with V2O5 content of 22–26% and a high amount of harmful impurities. Multistage counterflow leaching can be used to fabricate solutions with vanadium pentoxide concentration suitable for vanadium precipitation by hydrolysis and adding ammonium salts. The solutions with V2O5 content of ≈15 g/L can be obtained from the initial sludge by three-stage counterflow vanadium leaching. A concentrate with a content of 78 wt% V2O5 can be precipitated from these solutions at pH = 2.4 by adding ammonium chloride. Additionally, concentrate with V2O5 content of ≈94 wt% was precipitated from the solution with a concentration of >20 g/L V2O5 obtained from the roasted sludge. The concentrates were purified for increasing the vanadium content to 5–7%. The consumption and technological parameters of the considered processes are presented in the paper.

Study of Forms of Compounds of Vanadium and Other Elements in Samples of Pyrometallurgical Enrichment of Ash from Burning Oil Combustion at Thermal Power Plants

“…In our previous work [ 39 ], the results of the study of an ash sample by XRD and XPS methods are presented. The studied ash sample contained FeSO4 sulfate and vanadium in the form of V 5+ and V 4+ compounds adsorbed hydrocarbons C n H m , i.e., carbon in the form of organic compounds with O–C and O=C bonds.…”

“…Pre-calcined reagents of the “hc” and “chda” brands were used. Fluxes (lithium tetraborate, lithium nitrate, and lithium carbonate) for fusion were dried for 3 h, then mixed in a certain proportion [ 39 ] and stored in a desiccator. When melting calcined samples that did not contain carbon, a flux was used, which was a mixture of 65 wt% Li 2 B 4 O 7 and 35 wt% LiBO 2 .…”

Effect of roasting process on the V (anti-tumor agent) recovery from the slag of the electric arc furnace (EAF)

“…Drawing insights from recent advancements in related fields, this study aims to elucidate the intricate dynamics governing the roasting process and its impact on V recovery efficiency. By synthesizing principles from hydrometallurgical process, materials science [ 17 , 18 ], and medical informatics [ [19] , [20] , [21] ], this research endeavors to optimize the salt roasting procedure, thereby maximizing V yield from steel slag. In addition, nowadays there is a growing need of V to use in other industries such as transportation, vessels, steel making (more than 98 %), non-ferrous alloys, chemical productions and electrical batteries.…”