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Carbon-based adsorbent particle for liquid lithium resource extraction, preparation method and preparation device

An adsorbent and lithium adsorption technology, applied in chemical instruments and methods, improvement of process efficiency, alkali metal oxides/hydroxides, etc., can solve the problems of poor water permeability of resin, difficult processing and molding, poor permeability of resin matrix, etc.

Active Publication Date: 2021-12-28
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

At present, widely used bonding materials include polyvinyl chloride (PVC), polyvinylidene fluoride (PVDF), and polyacrylonitrile (PAN). The resin is dissolved by solvent and mixed with adsorbent powder, and then passed through an extruder or The high pressure of the tablet press prepares flake or granular adsorbent particles. The particles prepared by this method have a large loading capacity, good mechanical strength, and low swelling rate, but PVC, PVDF, and PAN resins have poor water permeability, which leads to adsorption of the adsorbent particles. Severe capacity loss, only the surface layer has adsorption properties
The second type is derived from natural organic polysaccharide materials, such as sodium alginate, chitosan, and cellulose. These compounds are cross-linked by ions or alkalis, and have problems such as hydrolysis and poor strength.
The third type, such as polyacrylamide and other polymers, has a long polymerization time and poor strength, and subsequent processing and molding are difficult
[0004] Judging from the above-mentioned prior art, the current adsorbent granulation used to extract lithium from brine has defects such as poor permeability of the resin matrix, easy degradation and deterioration, or difficulty in processing and molding, which seriously affects the large-scale application of lithium extraction in industry.

Method used

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  • Carbon-based adsorbent particle for liquid lithium resource extraction, preparation method and preparation device
  • Carbon-based adsorbent particle for liquid lithium resource extraction, preparation method and preparation device
  • Carbon-based adsorbent particle for liquid lithium resource extraction, preparation method and preparation device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] A kind of loose carbon-based lithium adsorbent particles used for liquid lithium resource extraction is carried out in the following manner:

[0113] 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.

[0114] Step 2, dissolving polyvinyl alcohol with an alcoholysis degree of 85% in water to prepare a 10 wt% polyvinyl alcohol aqueous solution.

[0115] Step 3: Mix 90 g of 10 wt % polyvinyl alcohol aqueous solution with 32 g of aluminum-based adsorbent powder to obtain the first mixture, and pass through a 500-mesh filter to remove impurities and large particles.

[0116] In the 4th step, the first mixture obtained in the 3rd step is injected into an underwater granulator, and granulated in the first crosslinking agent aqueous solution, the composition of the first crosslinking agent aqueous solution is 3wt% boric acid, 1wt% ...

Embodiment 2

[0121] A preparation method of dense carbon-based adsorbent particles is carried out in the following manner:

[0122] Step 1, add Li 2 TiO 3 The titanium-based ion sieve adsorbent is dried at 80°C and crushed by a high-speed pulverizer to a particle size of 800-1000 mesh.

[0123] Step 2, dissolving polyvinyl alcohol with an alcoholysis degree of 85% in water to prepare a 10 wt% polyvinyl alcohol aqueous solution.

[0124] Step 3: Mix 90g of 10wt% polyvinyl alcohol aqueous solution with 25g of titanium-based ion sieve adsorbent powder to obtain the first mixture and pass through a 500-mesh filter to remove impurities and large particles, and evaporate the water to 20wt%.

[0125] In step 4, the evaporated first mixture obtained in step 3 is granulated using a granulator to obtain the first granules, and the first granules are immersed in the first aqueous solution of the crosslinking agent, the first crosslinking agent The composition of the aqueous solution is 3wt% boric ...

Embodiment 3

[0129] A dense carbon-based adsorbent particle for liquid lithium resource extraction is carried out in the following manner:

[0130] Step 1, add Li 1.6 mn 1.6 o 4 The manganese-based lithium ion sieve-type lithium adsorbent is dried at 80°C and crushed by a high-speed pulverizer to a particle size of 800-1000 mesh to obtain the manganese-based lithium-ion sieve-type lithium adsorbent powder.

[0131] Step 2, dissolving polyvinyl alcohol with an alcoholysis degree of 85% in water to prepare a 10 wt% polyvinyl alcohol aqueous solution.

[0132]Step 3: Mix 90 g of 10 wt % polyvinyl alcohol aqueous solution with 25 g of manganese-based lithium ion sieve-type lithium adsorbent powder to obtain the first mixture and pass through a 500-mesh filter to remove impurities and large particles.

[0133] In the 4th step, the first mixture obtained in the 3rd step is injected into an underwater granulator, and granulated in the first crosslinking agent aqueous solution, the composition ...

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Abstract

The invention discloses a carbon-based lithium adsorbent particle for liquid lithium resource extraction. No adhesive needs to be added in the forming process of the adsorbent particles, and carbon has a fixing effect on adsorbent powder; the size is stable, and swelling is avoided in long-term use in strong acid, strong alkali and water; strong acid resistance and strong alkali resistance are achieved, and lithium adsorption under the alkaline condition and desorption operation under the acidic condition can be met; the carbon-based particles have pore structures and can exchange with a solution in the adsorption and desorption process, so that the efficiency is improved. Another purpose of the invention is to provide a preparation method of carbon-based adsorbent particles extracted from liquid lithium resources, and the preparation method comprises the following steps: carrying out extrusion granulation on water-absorbent resin, preparing high-strength water-absorbent particles by using a secondary cross-linking process, and carbonizing the high-strength water-absorbent particles to prepare carbon-based adsorbent particles; the invention also aims to provide a preparation device of the carbon-based adsorbent particles for extracting the liquid lithium resource. The preparation device has the advantages that one set of equipment can be used for producing various products, continuous production can be realized, and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical materials, and in particular relates to a carbon-based adsorbent particle used for extracting liquid lithium resources, a preparation method and a preparation device. Background technique [0002] my country has huge reserves of lithium resources, ranking second in the world. Salt lakes in Qinghai and Tibet are rich in lithium resources. The salt lakes in Tibet are mainly carbonate-type salt lakes. The brine has a small magnesium-lithium ratio and is easy to mine. Qinghai salt lakes are mainly chloride and sulfate types, and the magnesium and lithium are relatively high, so mining is difficult. At present, the domestic development of salt lakes and lithium resources is usually done by drying salt in salt fields and extracting after concentration. This method is relatively low in cost, but there are problems such as long construction period of salt fields, low recovery rate of lithium extraction,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C22B7/00C22B26/12
CPCB01J20/20B01J20/28016C22B26/12C22B7/006Y02P10/20
Inventor 董明哲李军叶秀深刘忠火焱钱志强聂国亮吴志坚
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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