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Preparation method of aluminum adsorbent particles for liquid lithium resource extraction

An adsorbent and particle technology, which is applied in the field of preparation of aluminum-based adsorbent particles, can solve the problems of poor water permeability of adsorbent particles and slow adsorption process.

Active Publication Date: 2021-10-19
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 3. Adsorbent particles prepared by granulation with materials such as polyvinyl chloride or polyvinylidene fluoride have poor water permeability and the adsorption process is relatively slow

Method used

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  • Preparation method of aluminum adsorbent particles for liquid lithium resource extraction
  • Preparation method of aluminum adsorbent particles for liquid lithium resource extraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] An aluminum-based adsorbent particle for extraction of liquid lithium resources is carried out in the following manner:

[0075] In the first step, the lithium aluminum hydrotalcite adsorbent is dried at 80°C, and crushed by a high-speed pulverizer to a particle size of 800-1000 mesh to obtain aluminum-based adsorbent powder.

[0076] Step 2, dissolving polyvinyl alcohol with an alcoholysis degree of 85% in water to prepare a 10 wt% polyvinyl alcohol aqueous solution.

[0077] Step 3: Mix polyvinyl alcohol aqueous solution and aluminum-based adsorbent powder at a mass ratio of 5:1, and mix evenly with a three-roll mill.

[0078] Step 4: Add a certain amount of first crosslinking agent aqueous solution to the mixture obtained in step 3, wherein the mass ratio of the mixture to the first crosslinking agent solution is 1:2, and the composition of the first crosslinking agent aqueous solution is 3wt% boric acid, 1wt% borax, 1wt% aluminum chloride, 1wt% calcium chloride, afte...

Embodiment 2

[0085] An aluminum-based adsorbent particle for extraction of liquid lithium resources is carried out in the following manner:

[0086] Step 1, drying the lithium aluminum hydrotalcite adsorbent at 80°C, and crushing it to a particle size of 800-1000 mesh by a high-speed pulverizer to obtain aluminum-based adsorbent powder;

[0087] Step 2, dissolving polyvinyl alcohol with a degree of alcoholysis of 85% in water to prepare a 10wt% solution

[0088] Step 3, dissolving polyacrylic acid with an average molecular weight of 1.25 million in water to prepare a solution with a concentration of 2 wt%.

[0089] Step 4: Mix the polymer aqueous solutions prepared in Step 2 and Step 3 at a mass ratio of 10:1, and use a high-viscosity stirring paddle to mix evenly to obtain a high-viscosity polymer mixed solution. Two types of polymers of the first type can be added, and the second type and the third type can be omitted.

[0090] Step 5. Add the aluminum-based adsorbent powder in step 1 ...

Embodiment 3

[0096] An aluminum-based adsorbent particle for extraction of liquid lithium resources is carried out in the following manner:

[0097] Step 1, drying the lithium aluminum hydrotalcite adsorbent at 80°C, and crushing it to a particle size of 800-1000 mesh by a high-speed pulverizer to obtain aluminum-based adsorbent powder;

[0098] Step 2, dissolving polyvinyl alcohol with a degree of alcoholysis of 85% in water to prepare an 8wt% solution

[0099] Step 3, dissolving sodium polyacrylate with an average molecular weight of 1.25 million in water to prepare a solution with a concentration of 2 wt%.

[0100] Step 4, dissolving sodium alginate in water to prepare a 3wt% solution

[0101] Step 5: Mix the polymer aqueous solution prepared in Step 2, Step 3, and Step 4 in a mass ratio of 10:1:1, and use a high-viscosity stirring paddle to mix evenly to obtain a high-viscosity polymer mixed solution.

[0102] Step 6: Add the adsorbent powder in step 1 to the high-viscosity polymer m...

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Abstract

The invention relates to a preparation method of aluminum adsorbent particles suitable for extracting lithium from original brine and old brine of a salt lake. The adsorbent particles are prepared by taking a water-absorbing polymer as a carrier, adding aluminum adsorbents such as lithium aluminum hydrotalcite, magnesium aluminum hydrotalcite and aluminum hydroxide with high loading capacity and carrying out secondary cross-linking. The preparation process is simple and suitable for industrial production. The prepared aluminum adsorbent particles have the characteristics of high elasticity, porosity, high water absorption, good permeability and the like. A resin matrix is resistant to strong acid and strong alkali, a polyhydroxy structure on the surface of the matrix can effectively adsorb adsorbent particles, and the solution loss rate is effectively reduced. The method can be applied to extraction of lithium elements in salt lake raw brine, old brine, seawater and underground water resources, and meanwhile the high-strength particles are suitable for an industrial adsorption column process.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, and in particular relates to a method for preparing aluminum-based adsorbent particles used for extracting liquid lithium resources. Background technique [0002] With the rapid development of lithium batteries, lithium alloys, lubricants and other industries, the market demand for lithium is increasing. Lithium resources in my country are mostly stored in salt lakes, groundwater, and seawater. These liquid lithium resources are low in content and coexist with a large amount of magnesium and calcium ions. They need to be enriched and purified before they can be used. At present, the technologies for extracting lithium from liquid lithium resources such as salt lakes mainly include solvent extraction, precipitation and adsorption. The precipitation method is only suitable for systems with high lithium content such as old brine. The lithium after precipitation needs to be dissolved and ...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C22B3/24C22B26/12
CPCB01J20/267B01J20/08B01J20/28016C22B26/12C22B3/24Y02P10/20
Inventor 董明哲李军郭敏刘忠李权张慧芳吴志坚
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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