Separation of cobalt and nickel from sulfate media using P507-N235 system

Liu, Kui; Long, Hua; Wang, Yan; Tang, Xiao-Meng

doi:10.1080/01496395.2017.1377250

Cited by 9 publications

(4 citation statements)

References 20 publications

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“…This is primarily because the hydroxides of these three metals have very low solubility in water, leading to low separation efficiency . Similarly, conventional solvent extraction methods are not suitable due to the similar solubility profiles of magnesium and cobalt in most common organic solvents . Ion exchange or resin adsorption techniques also fall short, as all three metal ions exhibit the same oxidation state and very similar ionic radii, making selective separation …”

Section: Resultsmentioning

confidence: 99%

“…(C 8 H 17 ) 2 HPO 3 ), when used in these processes, are less effective due to the coextraction of magnesium, which substantially lowers the separation factor between nickel and cobalt. 12 Consequently, this leads to the need for additional extraction stages, resulting in increased time and energy consumption and a reduced overall efficiency in the separation of nickel and cobalt.…”

Section: E T H Y L H E X Y L ) [ ( 2 -E T H Y L H E X Y L ) O X Y ] P...mentioning

confidence: 99%

“…40 Similarly, conventional solvent extraction methods are not suitable due to the similar solubility profiles of magnesium and cobalt in most common organic solvents. 12 Ion exchange or resin adsorption techniques also fall short, as all three metal ions exhibit the same oxidation state and very similar ionic radii, making selective separation. 41 However, the process developed in this study, as evidenced by our thermodynamic simulations and experimental results, has demonstrated its capability to effectively separate magnesium from nickel and cobalt mixtures.…”

Section: Contribution To Industrial Practice and Academic Researchmentioning

confidence: 99%

“…This issue is particularly problematic in the context of lithium-ion battery production, where the performance of the cathode material can be adversely affected by magnesium contamination in the final nickel and cobalt products. Common solvent extractants, such as versatic 10 (highly branched-C10 tertiary carboxylic acid also known as neodecanoic acid, C 10 H 20 O 2 ), Cyanex272 (bis(2,4,4-trimethylpentyl)phosphinic acid, C 16 H 35 O 2 P), P204 (dioctyl phosphate, C 16 H 35 O 4 P), and P507 ((2-ethylhexyl)[(2-ethylhexyl)oxy]phosphinic acid, (C 8 H 17 ) 2 HPO 3 ), when used in these processes, are less effective due to the coextraction of magnesium, which substantially lowers the separation factor between nickel and cobalt . Consequently, this leads to the need for additional extraction stages, resulting in increased time and energy consumption and a reduced overall efficiency in the separation of nickel and cobalt.…”

Section: Introductionmentioning

confidence: 99%

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Separation of Magnesium Impurity from Nickel and Cobalt Mixtures Using Ethylenediaminetetraacetic Acid and Temperature Optimization

Liu,

Malik,

Choi

et al. 2024

Ind. Eng. Chem. Res.

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This study aims to develop a process for separating magnesium from nickel and cobalt pregnant leach solutions, overcoming the limitations of conventional metal separation techniques. The process utilizes ethylenediaminetetraacetic acid (EDTA) for complexation, selectively binding with nickel and cobalt to reduce their coprecipitation with magnesium. Thermodynamic simulations and kinetic experiments are conducted at varying temperatures (25, 50, and 75 °C) to optimize the complexation and separation efficiency. The research demonstrates that increasing the temperature significantly accelerates the complexation kinetics, reducing the required time to less than 1 h. At 75 °C, over 98% of magnesium was selectively removed with minimal coprecipitation of nickel and cobalt (less than 2%). The study also highlights the reusability of EDTA, enhancing the process's economic and environmental viability. The developed process offers a rapid alternative to conventional methods for separating magnesium from nickel and cobalt mixtures. This method has potential applications in other industrial processes, particularly in hydrometallurgy, where rapid and selective metal separation is crucial. Further research is suggested to refine the process for specific industrial applications, focusing on scalability, cost-effectiveness, and environmental aspects. The adaptability of the method to other metal systems also presents an exciting avenue for future exploration in the metal processing industries.

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Section: Resultsmentioning

confidence: 99%

Section: E T H Y L H E X Y L ) [ ( 2 -E T H Y L H E X Y L ) O X Y ] P...mentioning

confidence: 99%