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

Inactive Publication Date: 2012-03-21
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, due to the small distribution ratio between EDTA in the polymer phase and the brine phase, the extraction rate of the target metal in the polymer is often not high, and it is e

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to the technical field of metal ion extraction, in particular to an improved method for extracting metal by a polymer matrix three-liquid-phase system. The method comprises the following steps: adding phase polymers and polymers decorated through EDTA (Ethylene Diamine Tetraacetic Acid), inorganic strong electrolyte salt and an organic solvent immiscible with water into a water solution containing various metal ions to be extracted, adjusting the pH value of the mixed solution, mixing sufficiently and centrifugally separating phases to obtain an upper, middle and lower three-layer concomitant liquid-liquid-liquid three-phase system. Different metal ions are respectively enriched into an upper phase, a middle phase or a lower phase due to the difference of combination capacities with EDTA. In the method disclosed by the invention, the cooperation of the metal extraction performances of the organic solvent phase and EDTA decorated polymers is fully exerted, and through the different distribution among different liquid phases, the extraction selectivity of a broad spectrum extraction agent and a coordinating agent is greatly improved, and the method has broad application prospects in the aspects of environmental sample analysis and test and resource recycling.

Description

technical field [0001] The invention relates to the technical field of metal ion extraction, in particular, the invention relates to an improved method for extracting metals by a polymer-based three-liquid phase system. Background technique [0002] Metal minerals, metal slag, or the leach solution of metal-containing secondary resources, as well as industrial wastewater discharged from metallurgical plants, almost always contain a variety of metal ions. Considering the comprehensive utilization of resources and environmental protection, it is necessary to separate target metals or purify and recover various metal elements from such multi-metal complex solution systems. Usually, there are many methods to choose from, such as crystallization method, adsorption method, precipitation method, electrolysis method, ion exchange method, metal replacement method, solvent extraction method, gas deposition method, etc. Among them, the solvent extraction method has a large production c...

Claims

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Application Information

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IPC IPC(8): C22B3/28C22B3/40
CPCY02P10/20
Inventor 刘会洲谢铿黄焜
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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