CN105948081B - A kind of method that utilization hydridization electric capacity extracts lithium in bittern - Google Patents

A kind of method that utilization hydridization electric capacity extracts lithium in bittern Download PDF

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CN105948081B
CN105948081B CN201610280822.9A CN201610280822A CN105948081B CN 105948081 B CN105948081 B CN 105948081B CN 201610280822 A CN201610280822 A CN 201610280822A CN 105948081 B CN105948081 B CN 105948081B
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lithium
activated carbon
lithium ion
bittern
hydridization
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CN105948081A (en
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王刚
王建韧
邱介山
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Dalian University of Technology
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Dalian University of Technology
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    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01DCOMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D15/00Lithium compounds
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00Physical properties of inorganic compounds
    • C01P2006/80Compositional purity

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  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
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Abstract

A kind of method that utilization hydridization electric capacity extracts lithium in bittern, belongs to energy and material and technical field.This method is based on a pole in hydridization capacitance principle, capacitance module and uses Mn oxide, and another pole uses the activated carbon with anion-exchange membrane, and control is applied to the voltage on electrode, and realization extracts lithium ion in the environment of salt lake bittern high Mg/Li ratio.Extract during lithium ion, the interference of magnesium ion in bittern can be effectively excluded on the premise of not being introduced into other ions.Only need to control applied voltage just can realize enrichment and the adsorbent reactivation of lithium ion, processing procedure is easy, realize the simple and effective extraction of lithium ion.This method single adsorptions amount can reach 3mg/g, and avoid the molten damage of manganese caused by the use of strong acid in regenerative process, improve the stability of adsorbent, and obvious decay is had no after circulate operation 50 times.The extracting method of the lithium ion has wide prospects for commercial application.

Description

A kind of method that utilization hydridization electric capacity extracts lithium in bittern
Technical field
The present invention relates to a kind of method that utilization hydridization electric capacity extracts lithium in bittern, belong to energy and material and technical field.
Background technology
Lithium and its compound have in terms of motor-car and energy storage industry, metal smelt and its manufacturing industry, aerospace industry There is important purposes, someone claims lithium to be " the energy source element of 21 century ", it is estimated that the year two thousand twenty lithium demand is up to 320,000 tons.
The source of lithium mainly includes seawater, ore and salt lake bittern.Contain about 2.5 × 10 in Global Seawater altogether14Kilogram Lithium, but its mean concentration is only 0.17mg/L, mainly takes absorption method to extract, it is less efficient;Ore carry lithium technology more into Ripe, but if being produced using the technology, China is needed for a long time from Australian import lithium ore, and cost is higher, in addition, entirely Ball also faces the problem of lithium ore resource is progressively exhausted.Therefore, producing lithium carbonate using salt lake bittern will turn into inevitable.
China is salt lake bittern lithium resource big country, and wherein Caidamu Basin saline lake lithium resource accounts for the whole nation and verified lithium resource 94.1%, the reserves verified at present in basin is 18,000,000 tons, is ranked first in the world;Be distributed mainly on Cha Er Han, In five salt lakes such as one inner level ground, West Taijinar, East Taijinaier, big bavin denier.In five salt lakes of the above, the general content of lithium chloride In 2-6 g/L, up to 8 more than g/L.For the salt lake bittern mainly salt pan evaporation used external at present.But This method is only applicable to the relatively low bittern of Mg/Li ratio and extremely time-consuming, poorly efficient.Another method is that FMC Corp. of the U.S. is directed to The selective absorption method that Argentinian Hombre Muerto salt lakes are proposed.This method is directed to the characteristics of bittern impurity is less, utilizes tool There is the adsorbent of ion sieve effect(Such as Mn oxide)Lithium chloride and lithium carbonate are directly extracted from bittern, the technique has production The characteristics of efficiency high, low production cost, represent the developing direction that following salt lake bittern carries lithium.But ion sieve still have with Lower problem:1st, there is the molten damage of manganese during the preparation of ion sieve adsorbant and its de- lithium.2nd, ion sieve adsorbent reactivation process is needed Strong acid is used, is not an environment-friendly process.3rd, easily disturbed in adsorption process by magnesium ion.
Therefore, the redox reaction based on lithium ion Yu lithium active material, constructs a kind of hydridization capacitor, can be effective Exclude brine lake in magnesium ion interference, efficiently reclaim lithium ion.Distinguish over existing lithium ion recovery technology a variety of scarce Fall into, the program has extremely strong industrial applications prospect.
The content of the invention
In order to overcome the deficiencies in the prior art, the present invention provides a kind of utilization hydridization electric capacity and extracts lithium in bittern Method, this method is by hydridization capacitor principle, to applying alive control, to realize absorption and the desorption to lithium ion, and And can effectively exclude the interference of magnesium ion in water body.
The technical solution adopted by the present invention is:
(1)By Mn oxide, binding agent, conductive black according to 8-10:1:1 ratio is mixed, and adds N, N- dimethyl second Acid amides, is made slurry;Mn oxide is LiMn2O4、Li1.33Mn1.67O4Or Li1.6Mn1.6O4Through 0.5M HCl soak 12 hours, Filter and dried product.
(2)By absorbent charcoal material, binding agent, conductive black according to 8-10:1:1 ratio uniform mixing, adds N, N- bis- Methylacetamide, is made slurry;
Above-mentioned slurry is respectively coated in collector(Graphite cake)On be made electrode, after drying, add on activated carbon electrodes Plus anion-exchange membrane;
(3)The activated carbon electrodes with anionic membrane and manganese oxide electrode are fixed on lucite spacer respectively, Poly (methyl methacrylate) plate upper left side remains for the duct of liquid turnover with lower right in advance, and being placed in the middle of two pieces of lucite spacers prevents The silica gel pad of two electrode contacts and liquid communication space is reserved, will be fixed after two pieces of glass plates alignment;
(4)Bittern is passed through in the module, and using hydridization capacitance principle, the choosing to lithium ion is realized by applying negative voltage Selecting property is adsorbed.After the completion of absorption, deionized water is passed through in the module, while by applying the lithium that positive voltage makes absorption on electrode Ion is desorbed the formation lithium solution in deionized water, then the lithium-containing solution is concentrated, and evaporative crystallization is so as to obtain pure lithium salts.
The binding agent is selected from Kynoar, polytetrafluoroethylene (PTFE) or polyvinyl alcohol.
The conductive black is acetylene black, CNT.
The activated carbon is YP-50, active carbon with high specific surface area.
The method that the hydridization capacitance principle extracts lithium is:Lithium active material has redox anti-with the lithium ion in solution Should, by applying negative voltage to active material electrode, the lithium ion in solution can be made to enter in lithium active material and magnesium Ion can not enter, and at the same time apply positive voltage to the activated carbon electrodes with anionic membrane, due to the effect meeting of electric field force Make the Anion-adsorption in solution in the surface of activated carbon so that electric charge realizes the selective absorption of lithium ion in balance solution.Inhale After the completion of attached, deionized water is passed through in the module, positive voltage is applied to active material electrode, and due to redox reaction, lithium is lived Property material can release lithium ion into solution, and activated carbon electrodes make the lithium ion of desorption due to the presence of anion-exchange membrane Activated carbon surface can not be adsorbed onto, at the same time to activated carbon electrodes apply negative electricity, be adsorbed in activated carbon surface it is negatively charged from Son is released in solution due to the effect of electric field force, and then realizes the extraction of lithium ion.
The negative voltage be to active material electrode apply relative to activated carbon electrodes negative voltage -0.8V~- 4.5V。
The positive voltage is to apply positive voltage 0.8V~4.5V relative to activated carbon electrodes to active material electrode.
This practicality invention beneficial effect be:This method is based on hydridization capacitance principle, can be effectively special from high Mg/Li ratio In the salina levied, selective extraction goes out lithium ion.By the material with lithium ion with redox reaction with carrying anion Hydridization capacitor is made in the activated carbon of film, by using hydridization capacitance principle, can effectively extract lithium ion, single adsorptions amount 3mg/g can be reached, and avoids the molten damage of manganese caused by the use of strong acid in regenerative process, the steady of adsorbent is improved It is qualitative, have no obvious decay after circulate operation 50 times.In addition, compared to the intermittently operated of traditional adsorption method, this method can Continuous operation, extraction process is simple to operate, is conducive to heavy industrialization application.In a word, compared to conventional method, this method shows Go out big advantage.
Brief description of the drawings
Fig. 1 is capacitor module.
Fig. 2 is lithium ion selective absorption and stability test figure.
Embodiment
Below by example, the invention will be further described
Embodiment 1
By Mn oxide LiMn2O4With conductive black acetylene black, binding agent Kynoar according to mass ratio 8:1:1 mixing Uniformly, add DMA and slurry is made is coated on graphite cake and electrode is made.Equally by activated carbon(YP-50)With Conductive black, binding agent are according to mass ratio 8:1:1 is well mixed, and addition DMA is made slurry and is coated on graphite Electrode is made on plate.
Embodiment 2
By Mn oxide Li1.33Mn1.67O4With conductive black acetylene black, binding agent Kynoar according to mass ratio 9:1:1 It is well mixed, add DMA and slurry is made is coated on graphite cake electrode is made.Equally by activated carbon(YP- 50)With conductive black, binding agent according to mass ratio 9:1:1 is well mixed, and adds DMA and slurry coating is made In electrode is made on graphite cake.
Embodiment 3
By Mn oxide Li1.6Mn1.6O4With conductive black acetylene black, binding agent Kynoar according to mass ratio 10:1:1 It is well mixed, add DMA and slurry is made is coated on graphite cake electrode is made.Equally by activated carbon(YP- 50)With conductive black, binding agent according to mass ratio 10:1:1 is well mixed, and adds DMA and slurry coating is made In electrode is made on graphite cake.
Electrode in embodiment 1 is placed in 80 DEG C of baking ovens, 12h is dried.By dried electrode, 5cm × 6cm is cut into Size, and activated carbon electrodes end is covered into one layer of anion-exchange membrane, add two electrode assemblings after silica gel pad into module(See Fig. 1).Under 25 degree of water bath conditions of constant temperature, with 5 ml/min water circulation speed, pass sequentially through 50ml and contain lithium ion and magnesium The mixed solution and deionized water of ion, apply 1.6V voltages to the electrode of module two, test the selective extraction of the module successively The ability of lithium.As can be seen from Figure 2, single adsorptions amount can reach 3mg/g, and avoid the use of strong acid in regenerative process and lead The molten damage of the manganese of cause, improves the stability of adsorbent, and obvious decay is had no after circulate operation 50 times.This method illustrates good Good selectivity, with stable cycle performance.In a word, this method selective effectively from magnesium lithium mixed solution can extract lithium Ion, with good industrial applications prospect.

Claims (1)

1. a kind of method that utilization hydridization electric capacity extracts lithium in bittern, it is characterised in that comprise the following steps:
(1)By Mn oxide LiMn2O4, binding agent Kynoar, conductive black acetylene black is according to mass ratio 8:1:1 ratio Mix, add DMA, slurry is made, manganese oxide electrode is made in coating on a current collector;
(2)By absorbent charcoal material YP-50, binding agent, conductive black according to mass ratio 8:1:1 ratio uniform mixing, adds N, N- dimethyl acetamides, are made slurry, and activated carbon electrodes are made in coating on a current collector;And added on activated carbon electrodes it is cloudy from Proton exchange, is made the activated carbon electrodes with anion-exchange membrane;
(3)Assemble capacitor module:The activated carbon electrodes with anionic membrane and manganese oxide electrode are fixed on organic glass respectively On glass dividing plate, remain for the duct of liquid turnover in advance on poly (methyl methacrylate) plate upper left side and lower right, in two pieces of lucite spacers Centre places the silica gel pad for preventing two electrode contacts and reserves liquid communication space, will be fixed after two pieces of glass plate alignment;
(4)Bittern is passed through in the module, and using hydridization capacitance principle, the selectivity to lithium ion is realized by applying negative voltage Absorption;After the completion of absorption, deionized water is passed through in the module, while by applying the lithium ion that positive voltage makes absorption on electrode It is desorbed in deionized water and forms lithium-containing solution, then the lithium-containing solution is concentrated, evaporative crystallization is so as to obtain pure lithium salts;It is described Negative voltage is to apply negative voltage -0.8V~-4.5V relative to activated carbon electrodes to manganese oxide electrode;Positive voltage is to manganese oxygen Compound electrode applies positive voltage 0.8V~4.5V relative to activated carbon electrodes;
The Mn oxide LiMn2O4For LiMn2O412 hours are soaked through 0.5M HCl, filtered and dried product.
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CN109078360B (en) * 2018-09-11 2021-04-02 中国科学院青海盐湖研究所 Sectioning type adsorption and desorption device and application thereof
CN109179589A (en) * 2018-09-20 2019-01-11 同济大学 The preparation method of carbon coating vanadium phosphate sodium electrode material and its application in hydridization capacitive deionization technology
CN109607711A (en) * 2019-01-30 2019-04-12 东莞理工学院 A kind of hydridization capacitive deionization desalination module and desalination process
CN113293285B (en) * 2021-05-21 2022-04-08 江苏中南锂业有限公司 Preparation method of modified lithium extraction electrode with fast ion conductor
CN113293289B (en) * 2021-05-21 2022-04-12 江苏中南锂业有限公司 Preparation method of hydrophilic lithium extraction electrode
CN113401944A (en) * 2021-06-18 2021-09-17 华中师范大学 λ-MnO2Nanorod electrode, preparation method and application of nanorod electrode in extraction of lithium in brine
CN115522071B (en) * 2022-10-13 2023-09-26 华东理工大学 Apparatus and method for activating electrodes

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CN102382984B (en) * 2011-07-04 2013-03-13 中南大学 Method for separating magnesium and lithium and enriching lithium from salt lake brine
CN103031568B (en) * 2011-10-08 2016-04-20 中国科学院青岛生物能源与过程研究所 A kind of method of electrolytic preparation metallic lithium
CN103272559A (en) * 2013-05-21 2013-09-04 北京化工大学 Application of porous carbon electrode material in electrosorb technology
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