Y. Pranolo et al. developed a mixed solvent extractant system for separating and purifying Co and Li from spent lithium ion battery leaching solution. Acorga M5640 was added to the Ionquest 801 organic solution, and the Cu and pH isotherms moved significantly, ΔpH 50 = 3.45. Therefore, in this mixed extractant system, separation of Fe(III), Cu, Al and Co, Ni, Li is easily achieved.
The McCabe-Thiele phase diagram at a system ratio of aqueous phase to organic phase = 2:1, pH = 4 indicates that the extraction of Fe, Cu, and Al requires three stages. The extraction kinetics of Fe(III) and Cu are very fast, while the extraction kinetics of Al is slow. With long high temperature from room temperature to 40 ℃, extraction kinetics of Al is increased significantly, so the metal extraction should be carried out at 40 ℃, Al and Cu fast kinetics back-extracted, but can not be effectively back-extracted Fe, therefore, trans High acid is used to remove Fe during extraction. In the warm organic system, for the extraction of copper , Ionquest 801 is the extractant and Acorga M5640 plays a synergistic role.
A process for recovering Co and Li from spent lithium ion battery leachate is recommended: the first solvent extraction process uses a mixed Ionquest 801 and Acorga M5640 system, and the second process uses Cyanex 272. The advantage of this process is the availability of purer Co and Lu products.
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