Transfer of cobalt and nickel from sulphate solutions to spent electrolyte through solvent extraction and stripping

Kim, Huy Kang; Reddy, B. S. R.; Jung, Sun Ho; Mohapatra, Debasish

doi:10.1016/j.seppur.2006.02.007

Cited by 25 publications

(5 citation statements)

References 13 publications

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“…Solvent extraction is the most widely used method for separating these metals [8], but it has some limitations. The extractants commonly used [9][10][11][12][13] do not allow the achievement of separation coefficients greater than 10, and the conditions for implementing this technology call for high concentrations of mineral acids, particularly in the stripping stage.…”

Section: Introductionmentioning

confidence: 99%

Separation of Co(II) and Ni(II) Using an Analog of Glycine-Betaine Based on Task-Specific Ionic Liquids

et al. 2023

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A series of salts based on ethyl ester glycine-betaine derivatives, viz tri(n-pentyl)[2-ethoxy-2-oxoethyl]ammonium bromide, have been synthesized. These cations generate hydrophobic ionic liquids (ILs) with bis(trifluoromethylsulfonyl)imide (Tf2N−) or dicyanamide (Dca−) anions. These new analogues of glycine-betaine-based ionic liquids (AGB-ILs) were characterized using spectroscopic methods (IR, 1H, and 13C NMR) and elemental analysis. These AGB-ILs were used for the selective separation of Ni(II) and Co(II) in saline media using pure ILs phase or ILs diluted in organic solvent. Interestingly, extraction of Co(II) and Ni(II) in Dca-based AGB-ILs can be enhanced using salts with chaotropic anions such as NaNO3 (E > 90% for Co(II) and E = 85% for Ni(II)). Tf2N−-based ionic liquids do not extract Ni(II) or Co(II) even in NaCl 4M. Dca−-based ILs lead to a quasi-quantitative extraction of Co(II), while extraction of Ni(II) is limited to a few percent (17%) leading to separation factors higher than 100, ensuring a good separation of both metals. Cobalt could be back-extracted from the ionic liquid phase with water or with an aqueous solution of Na2SO4, which limits the release of the AGB cation in aqueous media, thus preserving its integrity. Results obtained by AGB-ILs diluted in organic solvent were comparable to those obtained with the pure AGB-ILs phase, indicating that this strategy can be deployed on systems working continuously out of equilibrium since the extraction mechanisms involve fast equilibria.

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Section: Introductionmentioning

confidence: 99%

Separation of Co(II) and Ni(II) Using an Analog of Glycine-Betaine Based on Task-Specific Ionic Liquids

et al. 2023

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“…The published literature data gave big attention to the separation of cobalt and nickel and most of these studies used cationic extractants such as Cyanex 272, Versatic10 acid, D2EHPA, PC88A, etc. [6,[27][28][29][30][31][32][33][34][35] When cationic extractants are used in a counter-current extraction process, the aqueous phase pH decreases, the pH of the aqueous phase decreases, making the are shown in Table 1. Kerosene, which is supplied by Sigma Aldrich, is used as the diluent.…”

Section: Introductionmentioning

confidence: 99%

Counter-current separation of cobalt(II)–nickel(II) from aqueous sulphate media with a mixture of Primene JMT-Versatic 10 diluted in kerosene

Belhadj

Benabdallah

Coll

et al. 2019

Separation Science and Technology

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This work claims the use of the mixture of Primene®JMT-Versatic 10 [HJMT + •Versatic − ] IL diluted in Kerosene as an extractant for cobalt/nickel separation from sulphate media by solvent extraction technique, its application on a continuous counter-current device is possible because the presence of Primene®JMT in the organic phase allows us to maintain the pH of the equilibrated aqueous phase at an almost stable value. The solvent extraction of cobalt and nickel ions is studied as a function of the extractant concentration in the organic phase and the concentration of both metals. By constructing the McCabe-Thiele diagram, we found that four steps are necessary to separate the cobalt(II) from the nickel(II) in sulphate media. A simulated continuous counter-current experiment corroborated the McCabe-Thiele predictions, obtaining a raffinate containing 83% of the inlet nickel with a purity of 99.9%, working with an A:O ratio 1:2.

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“…Although some of the reagents have been developed for the selective extraction of Ni(II) from Co(II), the more usual route has been to extract Co(II) leaving Ni(II) in the aqueous phase [4]. Different studies by solvent extraction technique involving Co(II) and Ni(II) species were carried out by different organophosphorus extractants in weak and/or strong acidic media [5][6][7][8][9][10][11][12]. The extraction and separation of cobalt and nickel from sulfate solution was carried out also using different extractants as di (2-ethylhexyl) phosphoric acid (DP-8R), LIX 860 in E-mail address: aanayl@yahoo.com.…”

Section: Introductionmentioning

confidence: 99%

Extraction and separation of Co(II) and Ni(II) from acidic sulfate solutions using Aliquat 336

Nayl

2010

Journal of Hazardous Materials

101

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Transfer of cobalt and nickel from sulphate solutions to spent electrolyte through solvent extraction and stripping

Cited by 25 publications

References 13 publications

Separation of Co(II) and Ni(II) Using an Analog of Glycine-Betaine Based on Task-Specific Ionic Liquids

Separation of Co(II) and Ni(II) Using an Analog of Glycine-Betaine Based on Task-Specific Ionic Liquids

Counter-current separation of cobalt(II)–nickel(II) from aqueous sulphate media with a mixture of Primene JMT-Versatic 10 diluted in kerosene

Extraction and separation of Co(II) and Ni(II) from acidic sulfate solutions using Aliquat 336

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