Solvent extraction of cobalt and nickel by organophosphorus acids I. Comparison of phosphoric, phosphonic and phosphonic acid systems

Preston, John S.

doi:10.1016/0304-386x(82)90012-3

Cited by 183 publications

(62 citation statements)

References 9 publications

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“…2) in CPME and dodecane were compared to determine the effect of the diluent on the extraction. D2EHPA is one of the most popular acidic extractants for liquid-liquid extraction processes and has been used in various processes for the purification of metals such as uranium, rare earths, and zinc [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Extraction Behavior of Metal Ions Using D2EHPA in Cyclopentyl Methyl Ether

Oshima

Fujiwara

Baba

2015

SERDJ

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Cyclopentyl methyl ether (CPME) has been developed as a commercially available ethereal solvent for application to various chemical processes. In the present study, the extraction of transition metal ions using di-(2-ethylhexyl) phosphoric acid (D2EHPA) in CPME and dodecane was studied in order to evaluate the potential of CPME as a diluent in the liquid-liquid extraction process. Transition metal ions were extracted by a proton exchange reaction using D2EHPA in CPME. The degree of extraction into CPME was reduced compared with dodecane. The extraction reaction of Cu(II) using D2EHPA in CPME and dodecane was confirmed by slope analysis. A 2 : 1 complex between dimeric D2EHPA and Cu(II) was formed in CPME and dodecane, and the extraction equilibrium constants were determined.

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Section: Introductionmentioning

confidence: 99%

Extraction Behavior of Metal Ions Using D2EHPA in Cyclopentyl Methyl Ether

Oshima

Fujiwara

Baba

2015

SERDJ

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“…During these measurements, it was observed that stable emulsions [1,7] that equilibration time for Co(II) and Ni(II) extraction from sulphate medium by Cyanex 272 dissolved in Xylene is 2-3 min; whilst Gandhi et al [9] and Tiat [10] have reported the equilibration time of 5 min for Ni(II)-SO 4 2--Cyanex 272-toluene system and of 10 min for Ni(II)-SO 4 2--Cyanex 272-toluene system, respectively. Therefore, the system under consideration appears as more labile than the reported ones.…”

Section: Extraction Equilibriummentioning

confidence: 94%

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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“…It has been found that the separation factor between cobalt and nickel increased in the following order, phosphinic > phosphonic > phosphoric 14,15) because of the increase in the stability of tetrahedral coordination compound of cobalt with the extractant in the organic phase 16) and the basicity of the extractants increases with the decrease in the distance of the alkyl chain from the central phosphorous atom. 17) Although the separation factor of cobalt and nickel by using phosphinic acid is highest among the three extractants, other conditions such as solution pH, ratio of Co-Ni concentration and economics should be considered, in choosing a suitable extractant for application.…”

Section: Cationic Exchange Reagentsmentioning

confidence: 99%

Separation of Cobalt and Nickel from Aqueous Solution

Liu¹,

Lee²

2013

Journal of the Korean Institute of Resources Recycling

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Recovery of pure cobalt and nickel from diverse resources is important due to the increased demand for these metals. In order to get cobalt and nickel with high purity, separation of them from other metal ions is necessary. In this review, several methods to obtain pure cobalt or nickel solution, such as solvent extraction, ion exchange, precipitation were introduced and compared. For solvent extraction, the advantage and disadvantage of the separation process together with detailed process conditions were investigated.

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Solvent extraction of cobalt and nickel by organophosphorus acids I. Comparison of phosphoric, phosphonic and phosphonic acid systems

Cited by 183 publications

References 9 publications

Extraction Behavior of Metal Ions Using D2EHPA in Cyclopentyl Methyl Ether

Extraction Behavior of Metal Ions Using D2EHPA in Cyclopentyl Methyl Ether

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

Separation of Cobalt and Nickel from Aqueous Solution

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