Complete removal of trace vanadium from ammonium tungstate solutions by solvent extraction

Ionic Liquids as Components of Systems for Metal Extraction

“…The Aliquat 336 ionic liquid operating over a broad pH range proved to be efficient for the extraction of vanadium and molybdenum. For example, Wang et al [40] used Aliquat 336 IL dissolved in sulfonated kerosene and thus attained complete recovery of trace amounts of vanadium(V) from an aqueous solution of ammonium tungstate. During the experiments, the authors [40] established the formation of a third phase when using 1 vol.% Aliquat 336 and 1 vol.% 2-octanol (modifying agent).…”

“…For example, Wang et al [40] used Aliquat 336 IL dissolved in sulfonated kerosene and thus attained complete recovery of trace amounts of vanadium(V) from an aqueous solution of ammonium tungstate. During the experiments, the authors [40] established the formation of a third phase when using 1 vol.% Aliquat 336 and 1 vol.% 2-octanol (modifying agent). However, when the 2-octanol concentration was increased to 5 vol.%, the formation of the third phase was not observed, and extraction was faster.…”

Electrochemical Selective Recovery of Heavy Metal Vanadium Oxyanion from Continuously Flowing Aqueous Streams

“…Likewise, solvent extraction is af ast, high capacity,a nd selective technique, but the process is complex with high reagent consumption. [25,26] In addition to thesep hysiochemical removal methods, various processes exist for recovery of vanadium, mostly in the alloy production industry.A sa ne xample,s ome studies suggest the addition of sulfuric or hydrochloric acids for metal dissolution along with as ubsequent purifications tep using techniques such as solvent extraction, [27] ion exchange [18] or crystallization. [28] Such methods, again, entail harsh acidic or basic conditions, and require costly and copious amounts of reagents for extraction/precipitation.…”

“…The main drawback of this method, however, is the requirement for chemical addition during the regeneration process. Likewise, solvent extraction is a fast, high capacity, and selective technique, but the process is complex with high reagent consumption . In addition to these physiochemical removal methods, various processes exist for recovery of vanadium, mostly in the alloy production industry.…”

Hydrometallurgical processes for heavy metals recovery from industrial sludges

“…In the study conducted by Innocenzi & Veglio (2012), two stages of extraction using D2EHPA in n-dodecane was found to be sufficient for the effective separation of Zn and Mn from a leaching solution containing Ni at the optimal conditions of pH ≤ 2.5 and O/A = 1/1, with a 30-min leaching period at ambient temperature (O/A = organic phase volume/aqueous phase volume). Wang et al (2018a) had studied the application of solvent extraction for the removal of trace V from an ammonium tungstate solution. The organic solvent, comprising 1% (v/v) Aliquat336 and 5% (ν/ν) 2-octanol, could reduce V(V) concentration from 0.42 g L -1 to 0.004 g L -1 after a sixstage extraction with pH 8.74, A/O = 1/1.25, and a 10-min of separation period at 25 °C.…”