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

Abstract

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Reclaiming rare earth elements from end-of-life products: A review of the perspectives for urban mining using hydrometallurgical unit operations

“…Ionic liquid separation has been applied for recycling of metals from NiMH batteries (Larsson and Binnemans, 2014). Metal ions were recovered from synthetic solutions with composition similar to leach liquors obtained after treatment of mixed anodic and cathodic material.…”

Recovery of critical metals using biometallurgy

“…Further research on the efficacy in REE leaching using other organic acids, such as gluconic acid, itaconic acid or acetic acid is required. In addition, oxalic acid might be an effective way of selectively precipitating REEs from industrial aqueous waste streams from hydrometallurgical processes [40]. …”

Phosphonium salts and P-ylides

“…This was a new iono-metallurgical approach for the processing of metals in ionic liquids. 201 Other applications include the development of a fluorine-free solvent for the extraction of europium(III) and other trivalent rare earth ions using trihexyl(tetradecyl)phosphonium N,N,N 0 ,N 0 -tetra(2-ethylhexyl)malonate, [P 66614 203 Also of note is the use of mutually immiscible ILs such as 1-ethyl-3-methylimidazolium chloride and [P 66614 ] bis(2,4,4-trimethylpentyl) phosphinate to extract rare earths, 204 the development of a process using [P 66614 ][NO 3 ] to extract rare earths and separate them from nickel or cobalt, 205 and the use of [P 66614 ]Cl for selective extraction and recycling of metals from nickel metal hydride batteries 206 and rare-earths from NdFeB magnets. 207 Extraction of rare earth ions was also studied by Matsumiya et al 208 using tri-n-butylphosphate in combination with [P 2225 ][TFSA].…”