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Spherical manganese dioxide type lithium ionic sieve

A manganese dioxide type, lithium ion technology, applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of difficult post-processing, difficult application, and easy bed collapse.

Inactive Publication Date: 2010-12-01
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, existing lithium-ion sieves have defects such as poor fluidity and permeability, and high exchange rate of dissolution loss (more than 0.5%), resulting in difficulties in its practical application [such as: in the existing nano-scale powder When the lithium ion sieve is packed into a fixed bed for adsorption-desorption, the bed resistance is huge, and the bed is easy to collapse so that the fluid is completely blocked
In addition, post-processing (solid-liquid separation) is very difficult]

Method used

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  • Spherical manganese dioxide type lithium ionic sieve
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  • Spherical manganese dioxide type lithium ionic sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Under the conditions of 5℃~50℃ and normal pressure (1atm), weigh 4.00g of polyvinyl chloride (polymerization degree: 1000±20) and dissolve it in 66ml of NMP. After the dissolution is uniform, add 20.00g of LiMn 2 o 4 Ultrafine powder, after stirring evenly, drop into 400ml deionized water with a dropper with a diameter of 3mm, wash, and dry at 40-180°C for 10-30 hours to obtain spherical LiMn 2 o 4 type ion sieve precursor. The resulting spherical LiMn 2 o 4 placed in 0.5mol·l -1 Soak in hydrochloric acid (H / Li=1.5, molar ratio) for 24 hours, wash with deionized water, and dry at 40-180°C for 10-30 hours to obtain spherical λ-MnO 2 (LiMn 2 o 4 The H type) is recorded as SMO-a, and the specific surface area (BET) of SMO-a is: 13.02m 2 g -1 , SEM images of the outer surface and cross-section of SMO-a are shown in figure 1 .

Embodiment 2

[0036]Weigh a series of quantitative SMO-a granular lithium ion sieves prepared in Example 1 and the corresponding powder ion sieve SMO-p1 respectively, and measure 0.010mol l -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 adsorption capacity of SMO-a is 2.19mmol·g -1 , corresponding to the existing ultrafine powder ion sieve (marked as SMO-p1), the adsorption capacity of SMO-p1 is 1.99mmol·g -1 . The experimental results show that the performance of the spherical ion sieve SMO-a is better than that of the powder SMO-p1. The results show that the use of PVC bonded molding has little effect on the lithium adsorption performance of ion sieves.

[0037] see results figure 2 .

Embodiment 3

[0039] Under the conditions of 5℃~50℃ and normal pressure (1atm), weigh 6.00g of polyvinyl chloride (polymerization degree: 800±10) and dissolve it in 66ml of NMP, and add 20.00g of Li 4 mn 5 o 12 Super powder, after stirring evenly, use a dropper with a diameter of 3mm to drop into a mixed solution of 400ml deionized water and ethanol, wash, and dry at 40-180°C for 10-30 hours to obtain spherical Li4Mn 5 o 12 type ion sieve precursor. The resulting spherical Li 4 mn 5 o 12 Put in 1.0mol·l -1 Soak in hydrochloric acid (H / Li=4, molar ratio) for 24 hours, wash with deionized water, and dry at 40-180°C for 10-30 hours to obtain spherical MnO 2 Ion sieve (Li 4 mn 5 o 12 Type H) is denoted as SMO-b. The specific surface area (BET) of SMO-b is: 36.32m 2 g -1 , whose SEM images are shown in image 3 .

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Abstract

The invention relates to a spherical manganese dioxide type lithium ionic sieve used for adsorbing lithium in the lithium solutions such as salt lake brine, seawater, well brine and geothermal water. The preparation method of the spherical lithium ionic sieve is that the solubility difference of polyvinyl chloride in organic solvent and water and the characteristic that spheres are formed naturally under the action of different surface tensions are utilized, and shaping and granulation are performed to powder ionic sieve to obtain the spherical lithium ionic sieve, wherein the average diameter of the ionic sieve is 2.0mm-350mm. The adsorption performance of the millimeter-scale spherical manganese dioxide type lithium ionic sieve prepared by the invention is similar to that of the existing nanoscale ultrafine powder manganese dioxide type lithium ionic sieve, thus the lithium ionic sieve of the invention lays a foundation for the commercial application of the manganese dioxide type lithium ionic sieve.

Description

technical field [0001] The invention relates to a spherical lithium ion sieve, in particular to a spherical manganese dioxide lithium ion sieve for absorbing lithium in (metal) lithium-containing solutions such as salt lake brine, seawater, well brine or geothermal water. Background technique [0002] Lithium metal (Li) has extremely strong electrochemical activity, and its simple substance or / and compounds have been successfully applied in many fields such as lithium-ion batteries, nuclear fusion power generation, aerospace, glass ceramics, petrochemical and metallurgy, and are important components of the national economy and national defense. It is an important strategic resource in construction and is known as "the energy metal that promotes the progress of the world". [0003] Lithium resources mainly exist in granite-pegmatite deposits, salt lake brine, seawater and geothermal water. Nearly 80% of the world's lithium salts are extracted from brine. Comprehensive develop...

Claims

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Application Information

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IPC IPC(8): B01J20/06B01J20/04B01J20/30
Inventor 肖国萍童柯锋张钦辉于建国
Owner EAST CHINA UNIV OF SCI & TECH
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