Optimization of Indium Recovery and Separation from LCD Waste by Solvent Extraction with Bis(2-ethylhexyl) Phosphate (D2EHPA)

Table 7

Single stage batch test of extraction, washing, and stripping. Aqueous phases were 0.1 M H₂SO₄ (extraction and scrubbing) and 1 M HCl (stripping). The organic phase was 0.25 M D2EHPA diluted in kerosene with 2% 1-decanol.

Metal ion	Wt % in aq. phase after extraction	Wt % in aq. phase after scrubbing	Wt % stripped into aq. phase	Wt % remains in the organic phase
	(0.1 M H2SO4)	(0.1 M H2SO4)	(1 M HCl)
Al(III)	77.3 ± 1.1%	3.1 ± 0.1%	9.1 ± 2.1%	10.5 ± 3.3%
Cu(II)	97.9 ± 1.0%	0.3 ± 0.1%	0.1 ± 0.1%	1.7 ± 1.2%
Fe(III)	0.8 ± 0.1%	0.6 ± 0.1%	1.9 ± 0.6%	96.7 ± 0.8%
In(III)	0.2 ± 0.1%	0.2 ± 0.1%	91.9 ± 4.9%	7.7 ± 5.1%
Sn(IV)	0.6 ± 0.1%	0.2 ± 0.1%	0.3 ± 0.2%	98.9 ± 0.4%
Zn(II)	93.5 ± 1.9%	6.6 ± 0.1%	0.5 ± 0.1%	<1.6%