Selective extraction and separation of nickel from cobalt, manganese and lithium in pre-treated leach liquors of ternary cathode material of spent lithium-ion batteries using synergism caused by Versatic 10 acid and LIX 84-I

摘要

The extraction of nickel from a leach liquor containing cobalt, manganese and lithium of Li-ion batteries cathode material using a mixture of Versatic 10 acid and LIX84-I was investigated. The leach liquor of LiB cathode material obtained with H2SO4/H2O2 as the lixiviant was purified by precipitating the leached aluminum, iron and copper as hydroxides by adjusting the pH to similar to 5. To extract nickel, the effect of Versatic 10 acid concentration was the experimental variable in the mixture of extractants. The pH-isotherms revealed the synergistic effect on nickel caused by the increasing concentration of Versatic 10 acid which decreased the pH(50) for nickel extraction and pH 5 was chosen as the most suitable pH for solvent extraction. A loading isotherm at pH 5 was constructed by changing the O/A ratio. The McCabe Thiele diagram predicted the possibility of using three stages to extract over 98% nickel, which was confirmed experimentally. The stripping test was carried out from loaded organic of Versatic 10 acid alone, LIX 84-I alone and the combination of Versatic 10 acid and La 84-L Slow stripping of nickel from LIX 84-I indicated that LIX 84-I and Versatic 10 acid acted as the extractant and synergist, respectively. (C) 2015 Elsevier B.V. All rights reserved.