Cobalt-Nickel Separation by Solvent Extraction With Bis(2,4,4 Trimethylpentyl)phosphinic Acid

Rickelton, W.A.; Flett, D.S.; West, D.

doi:10.1080/07366298408918476

Cited by 116 publications

(42 citation statements)

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“…ZnR2.RH and ZnR2.2RH metal organic species are found in both cases (24). Therefore the extraction equilibrium [2] can also be written in the case of Cyanex 272.…”

Section: Discussion Of the Resultsmentioning

confidence: 98%

“…These acidic dialkylphosphorous extractants are monobasic acids and their acidic character is also influenced by their structure, the dialkylphosphoric (D2EHPA) and the dialkylphosphonic (PC-88A) are stronger acids than the dialkylphosphinic (Cyanex 272) (6). Another important characteristic of the Cyanex 272 is its poor extraction properties for calcium (2), which is much more extracted by D2EHPA and PC-88A and of which can be taken advantage for calcium remo val.…”

Section: Introductionmentioning

confidence: 99%

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The extraction of zinc and other minor metals from concentrated ammonium chloride solutions with D2EHPA and Cyanex 272

Amer¹,

Luis²

1995

REVMETAL

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Resumen A comparative study is made of the extractants D2EHPA and Cyanex 272 for the zinc and minor metal extraction from aqueous concentrated ammonium chloride solutions, as those of the leaching liquors of the CENIM-LNETI process. Extraction equilibrium data for zinc are presented as extraction isotherms at constant pH and at a temperature of 50 °C. Zinc extraction and coextraction of minor metal ions as Cu, Ca, Pb, Mg, Cd, Co, Ni and Hg are studied. Mercury does not extract from concentrated ammonium chloride solutions. Cyanex 272 shows a better selectivity for zinc with regard to the minor metáis than D2EHPA, which is especially remarkable for calcium, the most coextracted element by D2EHPA. Nickel and cadmium coextraction is negligible for both extractants. The possible use of the Cyanex 272 as an altemative to D2EHPA is considered.Keywords: Zinc. Bis(-2-ethylhexil) phosphoric acid. Cyanex 272. Solvent extraction. Concentrated ammonium chloride solutions.Extracción del cinc y otros metales minoritarios de soluciones concentradas de cloruro amónico con D2EHPA y Cyanex 272Abstract Se realiza un estudio comparativo del comportamiento del D2EHPA y del Cyanex 272 durante la extracción del cinc y otros metales minoritarios de soluciones acuosas concentradas de cloruro amónico, como las de las soluciones de lixiviación del proceso CENIM-LNETI. Se presentan los datos de equilibrio de extracción del cinc en forma de isotermas de extracción a una temperatura de 50 °C y pH constante y se estudia la coextracción de los metales minoritarios Cu, Ca, Pb, Mg, Cd, Co, Ni y Hg. El mercurio no se extrae de las soluciones concentradas de cloruro amónico. La selectividad del Cyanex 272 para el cinc respecto de esos metales minoritarios es mejor que la del D2EHPA, siendo verdaderamente notable para el calcio, que es la impureza que más se coextrae con el D2EHPA. La coextracción de níquel y de cadmio es muy pequeña para ambos extractantes. Se considera la posibilidad del uso alternativo del Cyanex 272 en lugar del D2EHPA.Palabras clave: Cinc. Ácido di(-2-etilhexil) fosfórico. Cyanex 272. Extracción con disolventes. Solución concentrada de cloruro amónico.

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“…ZnR2.RH and ZnR2.2RH metal organic species are found in both cases (24). Therefore the extraction equilibrium [2] can also be written in the case of Cyanex 272.…”

Section: Discussion Of the Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

The extraction of zinc and other minor metals from concentrated ammonium chloride solutions with D2EHPA and Cyanex 272

Amer¹,

Luis²

1995

REVMETAL

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“…Figure 1a. In this case the synergetic effect on the solvent extraction is achieved by combination of Cyphos ® IL 101 and bis(2,4,4-trimethylpentyl)phosphonic acid, which is known as excellent solvent for the extraction of cobalt and nickel from both hydrochloride and sulfate acidic solutions (Rickelton et al, 1984;Danesi et al, 1985), and is currently used to produce more than a half of the western world's cobalt (Rickelton & Robertson, 1982;Robertson, 1983;Rickelton et al, 1984). Sun et al (2010b) Cyphos ® IL 104, together with soybean oil methyl ester (SBME, biodiesel) as delutant, as extractant for rare earth elements from aqueous solutions.…”

Section: Ils As Extracting Agents For Heavy Metalsmentioning

confidence: 99%

Quaternary Ammonium and Phosphonium Ionic Liquids in Chemical and Environmental Engineering

Stojanovic¹,

Morgenbesser²,

Kogelnig³

et al. 2011

Ionic Liquids: Theory, Properties, New Approaches

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“…Even though, Cyanex 272 without further purification has been used in this investigation. BTMPPA and RPO(OH) 2 [42][43][44][45] then the extraction equilibrium reaction may be depicted as:…”

Section: Procedures For Ni(ii)-extraction Equilibrium Data Treatmentmentioning

confidence: 99%

Extraction Equilibrium of Ni(II) in the Ni2+-SO42--Ac-(Na+, H+) - Cyanex 272 (H2A2)-kerosene-3%(v/v) Octan-1-ol System

Biswas

Karmakar

Rahman³

2011

J. Sci. Res.

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The title system has been studied elaborately. 3% (v/v) octan-1-ol is added as de-emulsifier. Equilibration time is < 2 min. Distribution ratio (D) at constant pH (eq) and [H 2 A 2 ] is independent of [Ni(II)] (aq) . The pH dependency is always found to be 2; whilst the extractant dependence is found to vary from 1 (at lower concentration region, lcr) to 3 (at high concentration region, hcr). Moreover, the distribution ratio is found to be inversely proportional to (1+6.92 [SO 42-]) and [Ac -]. Based on these results, the extraction equilibrium reactions have been proposed at various parametric conditions. The extraction process is endothermic (∆H = 54.66 kJ/mol). The K ex values at 303 K are evaluated to be 10 -11.086 and 10 -11.56 at lcr and hcr of extractant, respectively. The maximum loading capacity is 21.28 g Ni(II) per 100 g extractant indicating the formation of NiAcA at maximum loading. The stripping ability of various inorganic acids towards loaded nickel, as well as, the possibilities of separation of Ni(II) from its binary mixtures with other ions of 3d-block elements have also been investigated.

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Cobalt-Nickel Separation by Solvent Extraction With Bis(2,4,4 Trimethylpentyl)phosphinic Acid

Cited by 116 publications

References 1 publication

The extraction of zinc and other minor metals from concentrated ammonium chloride solutions with D2EHPA and Cyanex 272

The extraction of zinc and other minor metals from concentrated ammonium chloride solutions with D2EHPA and Cyanex 272

Quaternary Ammonium and Phosphonium Ionic Liquids in Chemical and Environmental Engineering

Extraction Equilibrium of Ni(II) in the Ni<sup>2+</sup>-SO<sub>4</sub><sup>2-</sup>-Ac<sup>-</sup>(Na<sup>+</sup>, H<sup>+</sup>) - Cyanex 272 (H<sub>2</sub>A<sub>2</sub>)-kerosene-3%(v/v) Octan-1-ol System

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