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

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,...

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.

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