Environmentally friendly approach to recover vanadium and tungsten from spent SCR catalyst leach liquors using Aliquat 336

Sola, Ana Belén Cueva; Parhi, Pankaj Kumar; Lee, Jin Young; Kang, Hee Nam; Jyothi, Rajesh Kumar

doi:10.1039/d0ra02229b

Cited by 31 publications

(6 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Figure , the plot of log D vs log[Aliquat 336] shows a straight line with a slope of 1.3, suggesting that at least one mole of Aliquat 336 is needed to extract and coordinate one mole of the extracted species in the LP phase. The determined stoichiometric ratio tungsten/Aliquat 336 for the NASX mechanism matches well with the one reported in traditional solvent extraction of tungsten via anion exchange. ,− In aqueous solutions, tungsten tends to form isopolyanions and it is, in fact, extracted as isopolytungstate. , No evidence exists that the same isopolytungstate species form in EG media, and the NASX mechanism can be assumed as reported in eq for a generic tungstate anion. Equation was postulated on the assumption that the linear behavior of the curve in Figure likely implies that the tungsten species does not change upon extraction, or at least the number of tungsten centers per extracted species does not.…”

Section: Resultssupporting

confidence: 80%

“…As a result of the NASX screening tests from model solutions, Aliquat 336 was chosen as an extractant over Cyanex 923 because of the more efficient iron(III) scrubbing and the good stripping efficiency using a buffer solution of NH 3 /NH 4 Cl. Subsequently, the NASX process to recover tungsten from a 2 mol L –1 HCl aq /EG real leachate was optimized for the Aliquat 336 solvent. − The effects of several diluents and the addition of a phase modifier are shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Solvometallurgical Process for the Recovery of Tungsten from Scheelite

Orefice

Nguyen

Raiguel

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The industrial state-of-the-art processes to extract tungsten from scheelite (CaWO4) require high pressures and temperatures. These flowsheets consume a large excess of chemicals (which are very hard to recycle) and generate up to 25 tons of high-salinity wastewater per ton of ammonium paratungstate product. In this work, a more sustainable conceptual flowsheet for the recovery of tungsten from high-grade (55.0 wt % W) and medium-grade (3.3 wt % W) scheelite ores was developed at the lab scale. Leaching of CaWO4 was tested in solutions of 37.0 wt % aqueous HCl in organic solvents (ethylene glycol, poly(ethylene glycol) 200, acetonitrile) and ionic liquids (Aliquat 336). The tungstate (H x W y O z n–) generated by the reaction between CaWO4 and HCl was only solubilized in the ethylene glycol system with an appropriate amount of 37.0 wt % aqueous HCl, whereas in all other solvents, it either precipitated or CaWO4 did not dissolve. After the dissolution of tungsten, nonaqueous solvent extraction was used to separate tungsten from calcium, by means of a solvent consisting of 20 vol % Aliquat 336 in the aliphatic diluent GS190 with 10 vol % 1-decanol as a modifier. Scrubbing with water removed the co-extracted iron. Finally, tungsten was recovered as ammonium tungstate (NH4)2WO4, the precursor of ammonium paratungstate, by stripping in a mixture of aqueous ammonia and ammonium chloride. Paratungstate is the most common intermediate for the production of tungsten oxide or tungsten metal. One drawback that needs to be adequately addressed, prior to further upscaling of this conceptual flowsheet, is the potential formation of trace levels of 2-chloroethanol in the leaching stage. It is hypothesized that this problem can be circumvented by further optimizing process conditions to enhance the mass transfer and reduce the reaction time, such as better mixing of the solid and the lixiviant.

show abstract

Section: Resultssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Solvometallurgical Process for the Recovery of Tungsten from Scheelite

Orefice

Nguyen

Raiguel

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Therefore, cleaner production and recycling are particularly important. 1 For refractory metal resources such as tungsten and molybdenum contained in waste materials, the realization of clean extraction and recycling is a hot research topic. 2,3 Tungsten, a national strategic resource, has a high hardness, high density, great melting point, low coefficient of thermal expansion, superb corrosion conflict, and safe processing performance, which is broadly expounded in the microelectronics, metallurgy, exosphere and other fields.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient sorption of molybdenum from tungstate solution with modified D301 resin

Guo

et al. 2021

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…Solvent extraction is the use of extractants to purify or separate V and W components from the solution. The main extractants currently used for V or W extraction from leach solutions are Cyphos IL 104, primary amine N1923, diethylhydroxydodecanone oxime (LIX 63), trioctylphosphine oxide (TOPO), trioctylmethylammonium chloride (Aliquat 336), and bis(2-ethylhexyl)phosphoric acid (HDEHP). − In particular, Xiao et al used acidified primary amine N1923 to extract V and W and V, Mo preferentially. W were separated by selective stripping of V and W with H 2 SO 4 and ammonia solutions, respectively (Figure ).…”

Section: Recycling Of Spent Vanadium–titanium Scr Catalystsmentioning

confidence: 99%

Strategy and Technical Progress of Recycling of Spent Vanadium–Titanium-Based Selective Catalytic Reduction Catalysts

Zhao,

Zhang,

Yang

et al. 2024

ACS Omega

View full text Add to dashboard Cite

Selective catalytic reduction denitration technology, abbreviated as SCR, is essential for the removal of nitrogen oxide from the flue gas of coal-fired power stations and has been widely used. Due to the strong demand for energy and the requirements for environmental protection, a large amount of SCR catalyst waste is produced. The spent SCR catalyst contains high-grade valuable metals, and proper disposal or treatment of the SCR catalyst can protect the environment and realize resource recycling. This review focuses on the two main routes of regeneration and recycling of spent vanadium−titanium SCR catalysts that are currently most widely commercially used and summarizes in detail the technologies of recycling, high-efficiency recycling, and recycling of valuable components of spent vanadium−titanium SCR catalysts. This review also discusses in depth the future development direction of recycling spent vanadium−titanium SCR catalysts. It provides a reference for promoting recycling, which is crucial for resource recovery and green and lowcarbon development.

show abstract

Environmentally friendly approach to recover vanadium and tungsten from spent SCR catalyst leach liquors using Aliquat 336

Abstract: A complete extraction and stripping process to obtain enriched vanadium and tungsten concentrate from spent SCR catalyst leach liquor.

Cited by 31 publications

References 52 publications

Solvometallurgical Process for the Recovery of Tungsten from Scheelite

Solvometallurgical Process for the Recovery of Tungsten from Scheelite

Highly efficient sorption of molybdenum from tungstate solution with modified D301 resin

Strategy and Technical Progress of Recycling of Spent Vanadium–Titanium-Based Selective Catalytic Reduction Catalysts

Contact Info

Product

Resources

About