1 research outputs found
High-Performance Recovery of Vanadium(V) in Leaching/Aqueous Solution by a Reusable Reagent-Primary Amine N1519
Efficient
extraction and stripping for recovering vanadiumÂ(V) from
the leaching/aqueous solution of chromium-bearing vanadium slag (V–Cr
slag) are essential to the reuse of heavy metals. The performance
characteristics of a new reagent, primary amine N1519, were first
reported for extracting vanadium. With a phase ratio of organic to
aqueous up to 1:1, 99.7% of vanadiumÂ(V) can be effectively extracted
from the leaching/aqueous solution, and powder of NH<sub>4</sub>VO<sub>3</sub> was obtained through the stripping with ammonia. The new
reagent can be recyclable in use for sustainable reuse after stripping.
Different extraction conditions, e.g., the initial pH of the leaching/aqueous
solution and the molar quantity of N1519 were investigated. The powder
of vanadium-organic compounds (VOC) with N1519 formed in the process
of extraction was obtained and purified through three-steps of solvent-out
crystallizations. The hydrogen bond association mechanism of extraction
was illustrated with the structure of VOC and the enthalpy change
in extraction process. The fast extraction process and slow stripping
procedure for recovering vanadiumÂ(V) are suitable for use in annular
centrifugal contactors with very short contact/resident times and
mixed-settler extractors with very good mass transfer, respectively.
The results offer significant advantages over conventional processes