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Journal of Dispersion Science and Technology Volume 40, 2019 - Issue 6
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Original Articles

Phase separation in solvent extraction of copper or nickel from acidic solution using a sulfonic acid (HDNNS) and a carboxylate ester (4PC)

Yuqing LuoCollege of Chemistry and Chemical Engineering, Central South University, Changsha, China; ;Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, ChinaView further author information
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Huiping HuCollege of Chemistry and Chemical Engineering, Central South University, Changsha, China; ;Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, ChinaCorrespondence[email protected]
View further author information
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Yongxi WangCollege of Chemistry and Chemical Engineering, Central South University, Changsha, China; ;Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, ChinaView further author information
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Fang HuCollege of Chemistry and Chemical Engineering, Central South University, Changsha, China; ;Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, ChinaView further author information
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Shan ZhuCollege of Chemistry and Chemical Engineering, Central South University, Changsha, China; ;Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, ChinaView further author information
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Shuaifei ZhangCollege of Chemistry and Chemical Engineering, Central South University, Changsha, China; ;Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, ChinaView further author information
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Ying ZhangCollege of Chemistry and Chemical Engineering, Central South University, Changsha, China; ;Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, ChinaView further author information
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Shengkang LiCollege of Chemistry and Chemical Engineering, Central South University, Changsha, China; ;Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, ChinaView further author information
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Junya WangCollege of Chemistry and Chemical Engineering, Central South University, Changsha, China; ;Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resource, Central South University, Changsha, Hunan, ChinaView further author information
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Pages 819-827 | Received 13 Mar 2018, Accepted 02 Jun 2018, Published online: 10 Oct 2018
 
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Abstract

Phase separation behavior is a critical character in determining the usefulness of a solvent extraction system in hydrometallurgy. A survey of the synergistic mixture containing dinonylnaphthalene sulfonic acid (HDNNS) and 2-ethylhexly 4-pyridinecarboxylate ester (4PC) for the extraction of copper or nickel from acidic single metal sulfate solution has been carried out to suggest how the physicochemical properties (density, viscosity and interfacial tension) and the morphology of the reverse micelles in the loaded organic phase affect the phase separation behavior in this paper. The specific settling rates (SSR), physicochemical properties, metal concentration and the excess water uptake (the content of water solubilized into the water pool of the reverse micelles) in the loaded organic phase during the extraction of Cu(II)/Ni(II) have been measured. The results show that the most effective parameters affecting the phase separation behavior are the viscosity and the excess water uptake of the loaded organic phase. We assume that the deceleration of the SSR is mainly due to the apparent increase of these two parameters or in a microscopic view, the apparent change of the morphology of the reverse micelles in the loaded organic phase. The small angle X-ray scattering (SAXS) results provide a direct evidence of such microstructural changes and well supports our assumption.

Graphical Abstract

Acknowledgment

The authors thank ExxonMobil Chemical for kindly supplying the diluent of Escaid 110.

Additional information

Funding

This work was supported by the National Basic Research Program of China (No.2014CB643401), the National Natural Science Foundation of China (No.51674294), and the Hunan Provincial Science and Technology Plan Project, China (No.2016TP1007).

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