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Solvent Extraction of Metal Ions from Sulfate Solutions Obtained in Leaching of Spent Ni-MH Batteries

Pośpiech Beata, Gęga Jerzy

New Trends in Production Engineering

2019

Vol. 2, Iss. 2

214-221

The nickel metal hydride batteries (Ni-MH) are used in many electronic equipment, like cell phones, computers, cameras as well as hybrid cars. Spent batteries can be a rich source of many metals, especially rare earth elements (REE), such as lanthanum (La), cerium (Ce), neodymium (Nd), praseodymium (Pr), samarium (Sm), gadolinium (Gd). Ni-MH batteries also contain iron (Fe) as well as non-ferrous metals, i.e. nickel (Ni), cobalt (Co), zinc (Zn), manganese (Mn), etc. Leaching of such waste with sulfuric acid solutions is one among many methods recovering of useful metals in hydrometallurgical processes. The main aim of this work was separation of metal ions from pregnant leach liquor (PLL) by solvent extraction using phosphorous compounds and ionic liquids (ILs). The initial pH of the aqueous solution was 0.1. Di (2-ethylhexyl) phosphoric acid (D2EHPA), bis (2,2,4-trimethylpentyl) phosphinic acid (Cyanex 272), and phosphoniumionic liquid - trihexyl (tetradecyl) phosphonium bis (2,4,4- trimethylpentyl) phosphinate (Cyphos IL 104) were used as the selective extractants. The initial concentration of the extractants in an organic phase was equal to 0.1 mol dm-3. The obtained results show that the highest extraction efficiency was obtained for Fe(III) and Zn(II) in extraction experiments with 0.1 M D2EHPA at pH of 0.1. Ni(II), Co(II) and REE remained in the aqueous solutions. In the next stage, REE were extracted with the mixture of 0.1 M Cyanex 272 and 0.1 M Cyphos IL 104 at pH equal to 3.8. Finally, Ni(II) and Co(II) ions were efficiently removed from the aqueous phase using 0.1 M solution of Cyphos IL 104 at pH around 5.4.

Przegląd wybranych parametrów najczęściej stosowanych akumulatorów nlklowo-wodorkowych oraz baterii pierwotnych manganowo-cynkowych i alkalicznych

Sierczyńska A., Skrzypczak W., Kopczyk M., Majchrzycki W.

Wiadomości Elektrotechniczne

2006

nr 8

3-9

Omówiono wybrane parametry małogabarytowych akumulatorów niklowo-wodorkowych i baterii pierwotnych manganowo-cynkowych oraz alkalicznych powszechnego użytku.

The paper presents selected parameters of generał purpose smali Ni-MH batteries and primary zinc-manganese and alkaline cells.