Method for separating and enriching < 7 > Li isotope through extraction-electromigration coupling
A technology of separation, enrichment and electromigration, applied in the field of extraction-electromigration coupled separation and enrichment of 7Li isotopes, which can solve the problems of difficult multi-stage continuous separation, the need for airtight operation, low current utilization efficiency, etc., and achieve simple and continuous operation , The effect of process cleaning and environmental protection
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[0051] Further, the preparation method of the lithium-loaded organic phase also includes: obtaining by directly dissolving lithium salt in the extracted organic phase or driving lithium ions into the extracted organic phase by an electric field.
[0052] Further, the concentration of lithium ions in the anolyte is above 0.05mol / L.
[0053] Further, when the concentration of lithium ions in the anolyte is lower than 0.05mol / L, a new anolyte can be replaced.
[0054] Furthermore, the anolyte with a lithium ion concentration lower than 0.05 mol / L can be reused through stripping.
[0055] In some more specific embodiments, the concentration of lithium ions in the anolyte in step (3) is above 0.05 mol / L.
[0056] Further, after step (3), if the concentration of lithium ions in the anolyte is lower than 0.05 mol / L, the anolyte is used as the extracted organic phase and applied to step (2) again.
[0057] In some more specific embodiments, the method also includes: enriching the ob...
Embodiment 1
[0073] (1) Mix N-butyl-N-methylpyrrole bis(trifluorosulfonyl)imide salt and butyl acetate at a volume ratio of 1:1, dissolve fluoro-benzo-12-crown-4, and form an extract The organic phase, wherein the concentration of fluoro-benzo-12-crown-4 is 0.1mol / L, and the preparation of lithium ion concentration is 15mol / L lithium chloride solution;
[0074] (2) Fully mix the extracted organic phase with the lithium chloride solution at a volume ratio of 1:1, and centrifuge to collect the lithium-loaded organic phase after shaking for 1 h;
[0075] (3) The organic phase loaded with lithium is used as the anolyte, the 0.1mol / L ammonium chloride solution is used as the catholyte, the pure copper electrode is used as the anode and the cathode, and the polypropylene film is used as the separator, and the electric field voltage per centimeter is 0.5V, constant Voltage direct current, collecting catholyte from 0h to 0.5h of electrification, 7 The abundance of Li is 92.65%;
[0076](4) The c...
Embodiment 2
[0078] (1) Mix 1-propyl-3-methylimidazolium bis(trifluorosulfonyl)imide salt and dichloromethane at a volume ratio of 1:10, dissolve tetraacetyl-benzo-15-crown-5, and form Extracting the organic phase, wherein the concentration of tetraacetyl-benzo-15-crown-5 is 10mol / L, and the concentration of lithium ions is 20mol / L to prepare a lithium bis(trifluoromethanesulfonyl)imide solution;
[0079] (2) Fully mix the extracted organic phase with the lithium bis(trifluoromethanesulfonyl)imide solution at a volume ratio of 1:20, shake for 0.5 h and centrifuge to collect the lithium-loaded organic phase;
[0080] (3) The organic phase loaded with lithium is used as the anolyte, the 0.01mol / L potassium chloride solution is used as the catholyte, the platinum electrode is used as the anode and the cathode, and the polyethylene film is used as the separator. The electric field voltage per centimeter is 4.0V, and the collected Catholyte for 8h ~ 16h, 7 The abundance of Li is 92.60%;
[00...
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