In the recent years, the amount of waste has been drastically increasing, affected on the environment. On the other hand, there is observed a shortage of metals associated with the increase in their use and depletion of their natural resources. NiMH batteries. NiMH batteries contain, among nickel, cobalt, lanthanum, neodymium and other important metals. One of the possible and effective methods used for the metals recovery are hydrometallurgical processes, i.e. leaching and solvent extraction for metal separation. This work presents the results of the Zn(II), Co(II), Ni(II), La(III), Ce(IV) separation by solvent extraction. The source of metals was the solution from leaching of NiMH batteries. In the extraction process, chosen organic acids like , bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex 272), bis(2,4,4-trimethylpentyl)ditiophosphinic acid (Cyanex 301), bis(2,4,4-trimethylpentyl)tiophosphinic acid (Cyanex 302) and di(2-ethylhexyl)phosphoric acid (D2EHPA) were used as the extractant.Keywords: solvent extraction, rare earth elements, nickel–metal hydride batteries
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