Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 234, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2019.115812
Keywords
Hydrometallurgy; Anti-solvent crystallization; NiMH battery recycling; Rare earth recovery
Categories
Funding
- Swedish Energy Agency, Sweden [37724-1]
- Swedish Foundation for Strategic Research, Sweden SSF [IRT 11-0026]
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Rare earth elements (REE) have been selectively recovered from NiMH battery leach liquors by antisolvent precipitation. The active anode material was leached using sulfuric acid. The REE were then separated from the other elements by precipitation as sulfates after addition of either ethanol or 2-propanol (antisolvent). In a second step, Ni and Co are separated as sulfates by the same technique. The concentration of elements in different acid alcohol mixtures at 25 degrees C and -10 degrees C respectively are presented as a function of time after addition of the alcohol, and the optimum conditions for separation of the REE in pure form are presented. Under optimum conditions, 5.6 mol/L (Organic/Aqueous (O/A) volumetric ratio = 0.7) of 2-propanol at 25 degrees C, 82% of the REE have precipitated 3 h after addition of the antisolvent and the purity is 99.9%.
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