Highly efficient separation of rare earths from nickel and cobalt by solvent extraction with the ionic liquid trihexyl(tetradecyl)phosphonium nitrate: a process relevant to the recycling of rare earths from permanent magnets and nickel metal hydride batteries

Abstract

The undiluted ionic liquid trihexyl(tetradecyl)phosphonium nitrate was used for cobalt–samarium and nickel–lanthanum separations by solvent extraction.

Selective Extraction of Metals from Chloride Solutions with the Tetraoctylphosphonium Oleate Ionic Liquid

“…s at 313 K), which is still significantly lower than observed for other similar bulky metal-loaded IL extraction systems. 21 Moreover, TOC analysis showed that the solubility of [P 8888 ][oleate]…”

Titanium alkylphosphate functionalised mesoporous silica for enhanced uptake of rare-earth ions

“…The decrease in lanthanide uptake with increasing acidity is likely due to the competitive co-extraction of HNO 3 . 40 The desorption process was almost quantitative when using a 0.1 M HNO 3 solution (Fig. S6), in which H + inhibited the residual ion exchange sites (silanol and titanol) and low nitrate concentration favoured the breakdown of lanthanide nitrate complexes.…”

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].…”