Selective recovery and separation of nickel and vanadium in sulfate media using mixtures of D2EHPA and Cyanex 272

Noori, Mehdi; Rashchi, Fereshteh; Babakhani, Ataollah; Vahidi, Ehsan

doi:10.1016/j.seppur.2014.08.038

Cited by 46 publications

(10 citation statements)

References 45 publications

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“…After each run, the aqueous phase pH was measured, and the results showed a decrease in pH as soon as the extraction process took place (Table 3). Indeed, the uptake of metal ions decreases the pH of the aqueous feed phase (Agrawal et al, 2012;Babakhani et al, 2014;Noori et al, 2014;Devi, 2015) as a result of an increase of [H + ] ions in the aqueous feed phase, which is a side effect of the metalcarrier complexation in the feed-organic interface (Eq. 2).…”

Section: Extraction Studiesmentioning

confidence: 99%

The recovery of rare earth metals from WEEE leaching solution via liquid-liquid extraction

Talebi¹,

Marra²,

Cesaro³

et al. 2018

Issue 4

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<p>The recovery of rare earth metals (REMs) from end-of-life products, such as Waste Electrical and Electronic Equipment (WEEE), is drawing great attention as an attractive strategy for promoting the sustainable development. The hydrometallurgical technique of solvent extraction has been reported to be one of the most interesting method to recover REMs. However, when applied to WEEE, this process is challenged by the heterogeneous composition of electronic waste, completely different from other solid matrices, and it still has much rooms of improvements. This study investigated the extraction, stripping and recovery of REMs from a WEEE leaching solution using Versatic 10 as carrier in the organic phase and oxalic acid as stripping agent. A factorial design was carried out to evaluate the simultaneous effects of factors as the feed phase pH and the concentrations of both extractant and organic phase modifier in the extraction process. Cerium, lanthanum and yttrium were extracted at high percentages using 200 mM of Versatic 10, loaded by 100 mM of TBP in kerosene at pH 7. Moreover, 750 mM of oxalic acid successfully stripped and recovered 7.63 and 13.82 mg/kg of lanthanum and yttrium, respectively.</p>

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Section: Extraction Studiesmentioning

confidence: 99%

The recovery of rare earth metals from WEEE leaching solution via liquid-liquid extraction

Talebi¹,

Marra²,

Cesaro³

et al. 2018

Issue 4

View full text Add to dashboard Cite

show abstract

“…Most of separation and recovery was done employing synergetic effects of two or more extractants (Noori et al 2014;Shaeri et al 2015;Tavakoli and Dreisinger 2014;Wu et al 2012), however the occurrence of white turbidity and a third phase formation was the major problem observed during stripping of V from the loaded organic (Li et al 2011;Sahu et al 2013). The present study focussed on the extraction studies of V along with closely associated metal ions from nitrate solutions and its quantitative recovery from spent V 2 O 5 catalyst employing Cyanex 272 without synergetic effect, which certainly enhance financial viability of methodology.…”

Section: Cyanex 272 or Bis(244-trimethylpentyl)phosphinic Acidmentioning

confidence: 99%

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

Painuly

2015

Environ Syst Res

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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.

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“…The solvent extraction method, with various extracting reagents, has gradually been the primary methods due to its high efficiency with no requirement for complex equipment 19 . Among the reagents used for vanadium extraction, the acid extractant D2EHPA (Bis(2-ethylhexyl) phosphate) provides advantages of acid system adaptability and easy stripping [20][21][22] . The appropriate pH range for solvent extraction of vanadium is 1.5-2.5; however, the acidity of the acid leaching solution is often excessive, requiring pretreated to allow subsequent steps in the extraction process 23,24 .…”

Section: Introductionmentioning

confidence: 99%

Effects of different alkalis on the behaviour of vanadium loss in the pretreatment of vanadium-bearing acid leaching solution

Zheng¹,

Zhang²,

Bao³

et al. 2019

ScienceAsia

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This study examined the effect of different pretreating agents on vanadium loss from vanadium-bearing shale. Acid leaching solutions with added Ca(OH) 2 , CaCO 3 , NaOH, Na 2 CO 3 , and ammonia solution were evaluated. The pH of the acid leaching solution was adjusted to 2.0 to reduce vanadium loss and allow efficient removal of impurities, providing a high vanadium extraction efficiency. Ca(OH) 2 was the most effective neutralizer and its use resulted in a vanadium loss rate was as low as 4%. SEM-EDS analysis indicates that a major cause of vanadium loss is entrapment and absorption by precipitates. The low vanadium loss rate using Ca(OH) 2 as a neutralizer appears to be due to the smooth and flat surface of the precipitate, which limits vanadium entrainment. When the pH was adjusted with CaCO 3 , the crystal structure of the precipitate was incomplete. In addition, CaSO 4 and iron phosphate particles interact, promoting entrainment and absorption of vanadium. Similarly, flocculent iron phosphate was generated when the pH was adjusted with NaOH, Na 2 CO 3 , or ammonia, resulting in a crystal with a rough surface that easily entrained vanadium.

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Selective recovery and separation of nickel and vanadium in sulfate media using mixtures of D2EHPA and Cyanex 272

Cited by 46 publications

References 45 publications

The recovery of rare earth metals from WEEE leaching solution via liquid-liquid extraction

The recovery of rare earth metals from WEEE leaching solution via liquid-liquid extraction

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

Effects of different alkalis on the behaviour of vanadium loss in the pretreatment of vanadium-bearing acid leaching solution

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