Sodium salts of D2EHPA, PC-88A and Cyanex-272 and their mixtures as extractants for cobalt(II)

Devi, Niharbala; Nathsarma, K.C.; Chakravortty, V.

doi:10.1016/0304-386x(94)90070-1

Cited by 56 publications

(25 citation statements)

References 6 publications

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“…Most authors suggest a 1:4 complex (CoR 2 (RH) 2 ) [13][14][15][16][17][18] for cobalt and a 1:6 complex for nickel (NiR 2 (RH) 4 ) [15][16][17], some others suggest a 1:3 complex [19] and 1:2 complex for cobalt [20,21]. For nickel a 1:4 complex is found [22].…”

Section: Slope Analysismentioning

confidence: 97%

Separation of Cobalt and Nickel by Reactive Extraction – Modeling of Equilibria

et al. 2006

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FTIR analytics was used to estimate the complex stoichiometry when reactively extracting cobalt and nickel. Investigations were carried out at three distinct concentration levels at a Co-to-Ni ratio of 10. Additionally, the nonideal phase behavior in the system 2.4 M NaOH, phosphinic acid and diluent Escaid 120 was studied. Using the derived CoR 4 and NiR 4 complexes allows modeling of the reactive phase equilibria by applying the Pitzer model and the regular solution theory of Hildebrand and Scott.

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Section: Slope Analysismentioning

confidence: 97%

Separation of Cobalt and Nickel by Reactive Extraction – Modeling of Equilibria

et al. 2006

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“…However, such acidic extractants as Cyanex 272 (Kang et al 2010;Zhu et al 2011), Cyanex 301, Cyanex 302 (Sole andHiskey 1995) and DEHPA (Kongolo et al 2003;Van de Voorde et al 2006) can be successfully replaced by their sodium salts to extract Ni(II) and Co(II) from various aqueous solutions (Devi et al 1994(Devi et al , 1998. Devi et al (1994Devi et al ( , 1997Devi et al ( , 1998 have studied sodium salts of DEHPA, PC-88 (2-ethylhexylphosphonic acid mono-2-ethylhexyl ester) and Cyanex 272 for extraction of Co(II), Ni(II) and Zn(II) from model sulphate solutions. On the basis of their research, the authors indicated Na-Cyanex 272 as the best Co(II) extractant from among the extractants studied.…”

Section: Introductionmentioning

confidence: 98%

“…On comparing the effects of the use of acidic Cyanex 272 to those of its sodium salt (Na-Cyanex 272), some advantages of the salt application can be indicated: improvement in the efficiency in the initial pH range between 2.6 and 7 (Devi et al 1994), the presence of only monomeric form of the extractant (acidic extractant forms dimers resulting in reduction in extraction efficiency). Summarizing, the application of Cyanex 272 salt may improve extraction of divalent metal ions from sulphate secondary sources.…”

Section: Introductionmentioning

confidence: 99%

Removal of cobalt(II) and zinc(II) from sulphate solutions by means of extraction with sodium bis(2,4,4-trimethylpentyl)phosphinate (Na-Cyanex 272)

Regel‐Rosocka

Staszak

Wieszczycka

et al. 2016

Clean Techn Environ Policy

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The removal of Co(II) and Zn(II) from model and real crude nickel sulphate (CNS) solutions by extraction with sodium bis(2,4,4-trimethylpentyl)phosphinate (NaCyanex 272) is studied and compared with the effect of using bis(2,4,4-trimethylpentyl)phosphinic acid (Cyanex 272). The proposed novel approach to manage both hazardous metal ions from CNS with sodium salt of Cyanex 272 focuses on the following issues: (i) effect of the initial pH of feeds on the extraction efficiency, (ii) leaching of metal ions from CNS, (iii) efficiency and selectivity of metal ion extraction from real CNS, and (iv) FT-IR analysis of structure of complexes formed by the metal ions with the extractant studied. It is concluded that converting Cyanex 272 into its sodium salt greatly improves the efficiency of the extraction in comparison to the conversion into the acidic form of the extractant, regardless of the type of metal ion considered, whether Zn(II) or Co(II). These phenomena occurring in the extraction system are confirmed by the obtained FT-IR spectra of the organic phases after extraction and stripping.

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“…The synergism is measured by synergistic coefficient factor (S.C.). 25 The S.C. values revealed that the synergistic behavior in the extraction processing is positive if S.C. is higher than 0, negative if S.C. is smaller than 0 and has no effect when S.C. is equal to 0. On the other hand, the synergistic enhancement factor (S.E.F.)…”

Section: Synergistic Studiesmentioning

confidence: 99%

Solvent extraction studies on uranium using amine based extractants and recovery from low grade ore leach liquors

Kim¹,

Kumar²,

Kim³

et al. 2012

J. Braz. Chem. Soc.

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Neste estudo, extratores à base de amina (Alamine 336, Alamine 308, Alamine 304 e Aliquat 336) diluídos em querosene foram usados para extração de urânio e separação de outros elementos associados. Alamine 336 foi o melhor extrator para o processo de extração de urânio de soluções de sulfato quando comparado com outros reagentes à base de amina, Alamine 308, 304 Alamine 336 e Aliquat 336. O comportamento da extração sinérgica foi estudado com aminas como extratantes assim como reagentes sinergistas e organofosforados usados em misturas sinergistas com aminas. Os estudos de extração sinérgica com aminas não foram adequados entre si para melhor eficiência da extração. No entanto, aminas misturadas com extratores organofosforados forneceram comportamento sinérgico positivo, com um coeficiente de 0,567, calculado a partir de resultados obtidos. A metodologia desenvolvida foi aplicada ao processamento de minério de baixo grau de urânio, e 99,83% de urânio foi recuperado sem interferências de outros metais.In this study, amine based extractants (Alamine 336, Alamine 308, Alamine 304 and Aliquat 336) diluted in kerosene were used as promising extractants for uranium extraction and separation from other associated elements. Alamine 336 was the best extractant for uranium extraction process from sulfate solutions when compared with other amine based extractants, Alamine 308, Alamine 304 and Aliquat 336. Synergistic extraction behavior was studied with amines as extractants as well as synergists and organophosphorus reagents used as synergist mixed with amines. Synergistic extraction studies with amines were not suitable with each other for better extraction efficiency. However, amines mixed with organophosphorus extractants gave positive synergetic behavior with the highest synergistic coefficient 0.567 calculated from results obtained. The developed methodology was applied to uranium low grade ore processing and 99.83% of uranium was recovered without the interferences of other metals.

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Sodium salts of D2EHPA, PC-88A and Cyanex-272 and their mixtures as extractants for cobalt(II)

Cited by 56 publications

References 6 publications

Separation of Cobalt and Nickel by Reactive Extraction – Modeling of Equilibria

Separation of Cobalt and Nickel by Reactive Extraction – Modeling of Equilibria

Removal of cobalt(II) and zinc(II) from sulphate solutions by means of extraction with sodium bis(2,4,4-trimethylpentyl)phosphinate (Na-Cyanex 272)

Solvent extraction studies on uranium using amine based extractants and recovery from low grade ore leach liquors

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