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Granular lithium ion sieve

A lithium ion, granular technology, applied in the field of granular lithium ion sieves, can solve the problems of poor adsorption performance of granular lithium ion sieves, difficult solid-liquid separation, etc.

Inactive Publication Date: 2011-01-26
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a granular lithium ion sieve with fast adsorption rate, large adsorption capacity and stability in aqueous solution, which overcomes the difficulty of solid-liquid separation and the existing particle size of ultrafine powder lithium ion sieves in practical applications. Poor adsorption performance of lithium-ion sieve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Equipped with reflux condenser, stirring device, N 2 Add 200ml cyclohexane (oil phase) and 0.50g starch (dispersant) in the four-necked flask of conduit, 35 ℃, N 2 Pre-mixed evenly under the atmosphere;

[0041] Dissolve 7.00g of acrylamide (monomer) and 0.14g of N,N-methylenebisacrylamide (crosslinker) in 20ml of deionized water, and add 7.00g of Li 4 mn 5 o 12 Powder, after stirring evenly, add 0.27g initiator ammonium persulfate, and quickly transfer it to the above-mentioned four-necked flask, stir vigorously, heat up to 65°C, N 2 Polymerize under atmosphere for 4 hours, cool to room temperature, wash the obtained particles with deionized water, and dry to obtain a granular ion sieve precursor (abbreviated as LMO-a). Use 1.0mol·l -1 HCl (H / Li=2, molar ratio) solution delithiates LMO-a, washes, and dries to obtain the target object (modified lithium ion sieve, abbreviated as SMO-a), with an average particle size of 1 mm to 2 mm. SEM image see figure 1 .

Embodiment 2

[0043] Weigh 0.2g of SMO-a respectively, and measure 0.010mol·1 -1 LiCl NH 3 ·H 2 O-NH 4 Cl buffer solution (pH value 9-11), mix the two and put them into a constant temperature oscillator for adsorption experiments. The adsorption temperature is 30°C and the rotation speed is 150r min -1 , respectively measure the concentration of lithium ions in the solution at different times, the results are shown in figure 2 .

[0044] Depend on figure 2 It can be seen that after SMO-a is adsorbed for 15 minutes, the adsorption amount is 0.54mmol g -1 , after 1.04 hours, the adsorption capacity exceeded 2mmol·g -1 , the saturated adsorption capacity is about 4.10mmol·g -1 . The adsorption rate constant k of the formed granular ion sieve SMO-a ads is 1.286×10 -4 the s -1 , in the same order of magnitude as the powdered ion sieve (the adsorption rate k of the powdered ion sieve ads 3.290×10 -4 the s -1 ). And the saturated adsorption capacity is equivalent to that of powder...

Embodiment 3

[0046] Equipped with reflux condenser, stirring device, N 2 Add 200ml hexanaphthene (oil phase) and 0.50gspan-80 (dispersant) in the four-neck flask of conduit, 20 ℃, N 2 Pre-mixed evenly under the atmosphere;

[0047] Dissolve 7.00g of acrylamide (monomer) and 0.14g of N,N-methylenebisacrylamide (crosslinker) in 10ml of deionized water, and add 14.00g of Li 4 mn 5 o 12 Powder, after stirring evenly, add 0.27g initiator potassium persulfate, and quickly transfer it to the above-mentioned four-necked flask, stir vigorously, and heat up to 70°C, N 2 Under the atmosphere, polymerize for 10 hours, cool to room temperature, and wash the obtained particles with deionized water completely, and dry to obtain a granular ion sieve precursor (abbreviated as LMO-b). -1 HCl solution delithiates LMO-b, washes, and dries to obtain the target object (abbreviated as SMO-b), whose average particle size is 1mm-2mm, and its SEM image is shown in image 3 .

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Abstract

The invention relates to a granular lithium ion sieve, which is used for extracting lithium from (metal) lithium-containing solution such as salt lake brine, seawater, well brine or geothermal water and the like. The granular lithium ion sieve is prepared by cladding lithium ion sieve powder into a polymer in the process of forming a cross-linked polymer through the reversed phase suspension polymerization of an acrylate monomer. The granular lithium ion sieve has the advantages of high mechanical strength, high selectivity, high adsorbance, high adsorption rate (the adsorbance is 2 mmol*g<-1> in one hour) and high stability. The foundation is provided for extracting the lithium from the salt lake brine by an ion sieve adsorption method.

Description

technical field [0001] The invention relates to a lithium ion sieve, in particular to a granular lithium ion sieve for extracting lithium from (metal) lithium-containing solutions such as salt lake brine, sea water, well brine or geothermal water. Background technique [0002] Lithium resources in nature mainly occur in granite pegmatite deposits, salt lake brine, sea water and geothermal water. Most of the early lithium was extracted from lithium-containing ores. However, as the total reserves of lithium in ores are on the verge of depletion and the continuous discovery of lithium-containing salt lakes, people gradually turn their attention to extracting lithium from salt lakes. [0003] Lithium in brine often coexists with a large amount of alkali metal and alkaline earth metal ions in trace amounts. Due to their very similar chemical properties, it is very difficult to separate and extract lithium from it, especially the high content and high charge Mg 2+ The presence o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00
Inventor 张钦辉肖国萍童柯锋于建国
Owner EAST CHINA UNIV OF SCI & TECH
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