Modeling Au(CN) extraction by mixtures of primene JMT and cyanex 925 reagents

Alguacil, Francisco José

doi:10.1002/aic.690451012

Cited by 10 publications

(4 citation statements)

References 18 publications

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“…Extensive studies using CYANEX 925 have been carried out; for example, it has been used to extract and separate scandium(III),2 gold,5–8 3d transition elements,9, 10 arsenic,11 uranium,3 lead,12 tin(II),13, 14 zinc(II) and cadmium(II),15, 16 antimony(III) and bismuth(III),17 tellurium(IV) and selenium(IV) 18. Garcia‐Valls et al selectively separated the lanthanides using supported liquid membranes containing CYANEX 925 as a carrier19 and Jia et al investigated the synergistic extraction of La(III) using it as synergistic component 20.…”

Section: Introductionmentioning

confidence: 99%

Solvent extraction of lanthanides and yttrium from nitrate medium with CYANEX 925 in heptane

Wang

Zhou

et al. 2007

J of Chemical Tech & Biotech

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The extraction behavior of lanthanides and yttrium usinsg CYANEX 925 (mixture of branched chain alkylated phosphine oxides) in n-heptane from nitrate medium has been studied. The effects of aqueous phase ionic strength, CYANEX 925 concentration in the organic phase, and temperature on Sm 3+ , Nd 3+ and Y 3+ extraction have been investigated. The extractability of the lanthanides and yttrium increases with increasing nitrate concentration, as well as with increasing CYANEX 925 concentration. An extraction mechanism is proposed based on slope analysis. Furthermore, the infra-red spectra of CYANEX 925 saturated with lanthanides are employed to provide evidence of the composition of the complex. The relationship between the logarithm of the distribution ratio and lanthanide atomic number is also discussed which indicates that yttrium can be separated from light lanthanides. In addition separation of the light and heavy lanthanide groups is also possible using CYANEX 925. From the temperature dependence data, the thermodynamic parameters values ( H, S and G) are calculated.  2007 Society of Chemical IndustryKeywords: lanthanides; yttrium; CYANEX 925; extraction mechanism; separation INTRODUCTION CYANEX 925 is a branched chain alkylated phosphine oxide mixture whose structure is:The major component of the mixture is R 2 RP(O) representing approximately 85% of the mixture, while R 3 P(O) represents about 8% of mixture. The physical properties of CYANEX 925 are listed in Table 1. 1 CYANEX 925 has significant advantages as an extractant, such as greater hydrolytic stability and lower aqueous solubility than TBP; 2 a liquid at room temperature and available in a reasonably pure form, eliminating the need for tedious, reagent-consuming purification procedures.3 Because of the spatial steric hindrance effect of the branched chain, the extraction selectivity of CYANEX 925 is superior to CYANEX 923 (consisting of mixtures of R 3 PO, R 2 R PO, RR 2 PO and R 3 PO, R

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Section: Introductionmentioning

confidence: 99%

Solvent extraction of lanthanides and yttrium from nitrate medium with CYANEX 925 in heptane

Wang

Zhou

et al. 2007

J of Chemical Tech & Biotech

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“…But in this case after crossing through first aqueous contact, organic extractant loses its saponified value, which stops further extraction of metal ions in the remaining steps. Under metal ion extraction studies many authors have proposed utilization of bifunctional extractants or mixed ionic extractants such as, for iron (Davis and Grinnstead, 1970;Grinstead et al, 1969;Hirato et al, 1992;Kholkin et al, 1999, andTait, 1993), zinc (Fu et al, 2010;Hoh et al, 1982;Preston, and duPreez, 1996), cobalt (Cerpa and Alguacil, 2004;Cheng, 2006;Tait, 1993a), copper (Belkhouche and Didi, 2005;Fouad, 2009;Pranolo et al, 2010), nickel (Bacon and Mihaylov, 2002;Cheng, 2006;Preston and duPreez, 2000), gold (Alguacil, 1999;Alguacil, and Alonso, 2004) etc. Further references include utilization of mixtures of organophosphorus acids with amines (Bourget et al, 2005;Jakovljevic et al, 2004;Shuqiu et al, 1989;Tait, 1993aTait, , 1993b.…”

Section: Introductionmentioning

confidence: 98%

Studies on the extraction of Co(II) and Ni(II) from aqueous chloride solutions using Primene JMT-Cyanex272 ionic liquid extractant

et al. 2012

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“…Without such modification, amines can only extract gold from acidic solutions. Other publications have reported on the recovery of gold using various amine extractants 4–9. Recently, the guanidine derivative LIX 79 has been proven to be a selective extractant for Au(CN) 2 − when used in solvent extraction 10.…”

Section: Introductionmentioning

confidence: 99%

Extraction and recovery of gold from KAu(CN)₂ using cetyltrimethylammonium bromide microemulsions

Tianxi

Huang

Zhou

et al. 2001

J of Chemical Tech & Biotech

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Extraction and stripping of KAu(CN) 2 from alkaline solution by a w/o microemulsion formed with cetyltrimethylammonium bromide (CTAB) using 198 Au(I) tracer has been investigated. Various parameters, such as the Au(I) concentration in aqueous phase, concentrations of halide ions, NH 4 SCN and thiodiethylene glycol in stripping solution as well as the relationship between water and Au(I) concentration in the organic phase in the extraction and stripping of Au(I) were studied. The results show that almost all of the Au(I) in the aqueous phase was extracted into the organic phase. The water content decreased signi®cantly with an increase in Au(I) concentration in the organic phase, contrary to the results of a system with tributyl phosphate (TBP) as cosolvent. Almost all of the extracted Au(I) ($98%) can be recovered with pure thiodiethylene glycol as the stripping agent, and $93% of the Au(I) is stripped with high concentrations of NH 4 SCN(>3.0 mol dm À3

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Modeling Au(CN) extraction by mixtures of primene JMT and cyanex 925 reagents

Cited by 10 publications

References 18 publications

Solvent extraction of lanthanides and yttrium from nitrate medium with CYANEX 925 in heptane

Solvent extraction of lanthanides and yttrium from nitrate medium with CYANEX 925 in heptane

Studies on the extraction of Co(II) and Ni(II) from aqueous chloride solutions using Primene JMT-Cyanex272 ionic liquid extractant

Extraction and recovery of gold from KAu(CN)₂ using cetyltrimethylammonium bromide microemulsions

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Modeling Au(CN) extraction by mixtures of primene JMT and cyanex 925 reagents

Cited by 10 publications

References 18 publications

Solvent extraction of lanthanides and yttrium from nitrate medium with CYANEX 925 in heptane

Solvent extraction of lanthanides and yttrium from nitrate medium with CYANEX 925 in heptane

Studies on the extraction of Co(II) and Ni(II) from aqueous chloride solutions using Primene JMT-Cyanex272 ionic liquid extractant

Extraction and recovery of gold from KAu(CN)2 using cetyltrimethylammonium bromide microemulsions

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Extraction and recovery of gold from KAu(CN)₂ using cetyltrimethylammonium bromide microemulsions