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Issue 10, 2014
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Selective extraction of metals using ionic liquids for nickel metal hydride battery recycling

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Abstract

A new separation scheme for the recycling of metal values from nickel metal hydride batteries utilizing ionic liquids has been developed. The scheme has been optimized for synthetic solutions and uses either the ionic liquid trihexyl(tetradecyl)phosphonium chloride (Cyphos IL 101) or tricaprylmethylammonium chloride (Aliquat 336). In the first stage of extraction cobalt, manganese, iron and zinc are removed from the rare earths and nickel in a metal-loaded liquor of high chloride concentration (8 M chloride). Recovery of rare earths was demonstrated on the raffinate resulting from the first extraction by extraction with the solvating extractant Cyanex 923 (10% v/v) in tricaprylmethylammonium nitrate. Cobalt and manganese were separated utilizing tricaprylmethylammonium thiocyanate.

Graphical abstract: Selective extraction of metals using ionic liquids for nickel metal hydride battery recycling

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Publication details

The article was received on 14 Sep 2013, accepted on 31 Jul 2014 and first published on 31 Jul 2014


Article type: Paper
DOI: 10.1039/C3GC41930D
Citation: Green Chem., 2014,16, 4595-4603
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    Selective extraction of metals using ionic liquids for nickel metal hydride battery recycling

    K. Larsson and K. Binnemans, Green Chem., 2014, 16, 4595
    DOI: 10.1039/C3GC41930D

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