Improved method for extracting metal by polymer matrix three-liquid-phase system
A polymer and three-liquid phase technology, applied in the direction of improving process efficiency, can solve the problems of low extraction rate, small distribution ratio, EDTA dissolution loss, etc., achieve broad application prospects, improve sensitivity, and improve extraction selectivity Effect
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Embodiment 1
[0025]In an aqueous solution containing 100 μmol of Ti(VI), Fe(III) and Mg(II), the order of binding capacity of the three metals to EDTA is Fe(III)>Ti(VI)>Mg(II), add 2g A molecular weight of 10000 ethylene oxide-propylene oxide copolymer (wherein the polyethylene oxide block accounts for 90% of the mass fraction of the copolymer) and 80 μmol of polyethylene glycol with a molecular weight of 2000 modified by EDTA, EDTA modified The molar ratio of polyethylene glycol and Fe (III) is 0.8: 1, add 5g ammonium sulfate and 13.3mL 20% (v / v) phosphate bis (2-ethylhexyl) ester / n-heptane mixed organic solvent, use Sulfuric acid and sodium hydroxide were adjusted to pH=2, and the volume was fixed to 33.3mL. At this time, the volume of the two-phase aqueous phase was 20mL, and the volume ratio of the organic solvent and the two-water phase was 1:1.5. Fully mixed, centrifuged, and stood still. A liquid-liquid-liquid three-phase system in which the upper, middle and lower layers coexist is...
Embodiment 2
[0027] In an aqueous solution containing 100 μmol of Ti(VI), Fe(III) and Mg(II), the order of binding capacity of the three metals to EDTA is Fe(III)>Ti(VI)>Mg(II), adding 1.3 g molecular weight is the polyethylene glycol of 6000 and 110 μ mol of molecular weight modified by EDTA is the polyethylene glycol of 500, the molar ratio of EDTA modified polyethylene glycol and Fe(III) is 1.1: 1, add 5g sodium dihydrogen phosphate (or 2.8g disodium hydrogen phosphate) and 3.3mL 60% (v / v) bis(2-ethylhexyl) phosphate / n-hexane mixed organic solvent, adjust pH=2 with sulfuric acid and sodium hydroxide, and dilute to volume At this time, the volume of the two-water phase is 20mL, and the volume ratio of the organic solvent and the two-water phase is 1:6. Fully mix, centrifuge, and stand still to obtain a liquid-liquid-liquid three-phase coexistence of upper, middle and lower layers. system, the upper layer is an organic phase, the middle layer is a polyethylene glycol aqueous phase loaded ...
Embodiment 3
[0029] In an aqueous solution containing 100 μmol of Ti(VI), Fe(III) and Mg(II), the order of binding capacity of the three metals to EDTA is Fe(III)>Ti(VI)>Mg(II), adding 4g Ethylene oxide-propylene oxide copolymer with a molecular weight of 1000 (wherein the polyethylene oxide block accounts for 35% of the mass fraction of the copolymer) and 200 μmol of EDTA-modified polyoxyethylene-polyoxypropylene-polyoxyethylene Triphilic block copolymer, the mol ratio of EDTA modified polyoxyethylene-polyoxypropylene-polyoxyethylene triphilic block copolymer and Fe(III) is 2: 1, add 2.5g sodium phosphate (or potassium phosphate) and 10mL of 30% (v / v) bis(2-ethylhexyl) phosphate / n-heptane mixed organic solvent, adjust the pH to 1.3 with sulfuric acid and sodium hydroxide, and set the volume to 30mL, at this time the two aqueous phase The volume is 20mL, the volume ratio of the organic solvent and the two-water phase is 1:2, fully mixed, centrifuged, and left still to obtain a liquid-liqui...
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