Separation and recovery of vanadium from spent vanadium pentaoxide catalyst by Cyanex 272

Abstract

Background: The contact process preferably used vanadium pentaoxide as catalyst to increase the rate of reaction of producing sulphuric acid. Sulfuric acid plants regularly require catalyst replacement in order to cope with process improvements. The spent catalyst is considered as hazardous solid waste and cannot be discarded untreated owing to presence of high amount of vanadium and other associated metals. Because of significant environment implications of spent catalyst wastes, it is imperative to recover valuable metals present in them. The recovery of precious materials or metals from waste will not only help in mitigating environment problem due to metal pollution but also help improve the economy of the country. The purpose of this research work is to develop method to recover vanadium from spent V 2 O 5 catalyst. Results: The detailed study of extraction, separation and recovery of vanadium from leached spent catalyst solution of composition; V, 3.6% ; Al, 2.1%; Fe, 1.3%; Ti, 0.8% and less than 1 % of Cr and Pb is reported in this paper. Cyanex 272 (bis (2, 4, 4-trimethylpentyl) phosphinic acid) has been explored for the recovery of vanadium from spent V 2 O 5 catalyst. The effects of different parameters like, pH, solvent concentration, organic to aqueous ratio etc. were optimised for the complete extraction and recovery of vanadium. Conclusions: The proposed procedure gives high purity vanadium with almost a quantitative yield (~99%) and of course free from closely associated metals. The extractants could be reused up to ten cycles with no significant change in the extraction capability.

Recycling of Lithium‐Ion Batteries—Current State of the Art, Circular Economy, and Next Generation Recycling

“…For example Cyanex 272 shows a greater affinity for Ti over Fe at very lower solvent concentration. [ 279 ]…”

“…For example Cyanex 272 shows a greater affinity for Ti over Fe at very lower solvent concentration. [279] Another issue will be the presence of different anions in the system such as Cl -, B -, or Fas they also affect solvent extraction processes and the formation of organo-complexes. [277] However, this phenomena is not very well documented even for current recycling technologies.…”

Liquid-liquid extraction equilibrium study of vanadium(V) from nitrate medium by technical grade D2EHPA dissolved in kerosene

“…Various types of steps are used to retrieve the vanadium compounds (e.g., acid leaching [7], solvent extraction [8], etc.). A wide range of extractants can be used as solvents for the extraction of vanadium, such as tributyl phosphate (TBP) [9], Cyanex 272 [10], Cyanex 301 [11], EHEHPA [12], etc. Analytical grade D2EHPA has been used to extract vanadium (V) from chloride medium [13].…”

Features of the Microstructure and Chemical Compositions of Vanadium-Containing Slags Including Determination of Vanadium Oxidation Degrees

“…Metallurgical slags, vanadium processing slams, vanadium-containing quartzites, shales, pitch [16], uranium ore [17], bauxites [18], ash residuals from power units burning heavy oil fractions [19], dead catalysts [20], the ash of coal power plants, etc., could be alternative vanadium sources. A hydrometallurgical fabrication of technical vanadium pentoxide is characterized by a high amount of wastes containing V compounds; the main ones are dump slimes resulting from the leaching of vanadium from calcinated burden [21].…”