Preparation method of nano oxide coated long-life lithium ion sieve adsorbent

Abstract

The invention discloses a preparation method of a nano oxide coated long-life lithium ion sieve adsorbent. The method comprises the steps of: 1. dissolving a nano oxide and crushed lithium ion sieve adsorbent powder respectively in a same solvent according to a mass ratio of 1-10:100, and conducting ultrasonic dispersion for 0.5-3h to obtain two solutions; 2. mixing the two solutions uniformly, adjusting the PH to 8-10 with ammonia water, evaporating the solvent to dryness under stirring, and grinding the material obtained by evaporation to obtain nano oxide coated adsorbent powder; and 3. blending the nano oxide coated adsorbent powder with a polymer containing organic solution, conducting stirring for 2-4h, then adding the obtained suspension into deionized water drop by drop, thus obtaining the uniform spherical granular adsorbent with a particle size of 1-5mm. The preparation method of the nano oxide coated long-life lithium ion sieve adsorbent provided by the invention can improve the service life of the lithium ion sieve adsorbent.

Description

technical field [0001] The invention relates to a lithium resource recovery technology in the field of energy saving and emission reduction, in particular to a preparation method of a long-life lithium ion sieve adsorbent coated with nano oxides. Background technique [0002] With the continuous development and expanded application of power and energy storage new energy technology industries, the demand for lithium in the international market has maintained a rapid and continuous growth. At present, my country's lithium raw materials mainly come from the extraction of land ore, which accounts for only 12% of my country's total lithium reserves. Its mining costs are high and pollution is serious, and it has been unable to meet the needs of the growing new energy field. From my country's total lithium reserves, more than 86% Extracting and recycling lithium from salt lakes is the only way to develop new energy strategic industries. [0003] my country's lithium carbonate produ...

AI Technical Summary

Problems solved by technology

Qinghai Lithium Industry, Tibet Mining Industry and Qinghai CITIC Guoan have started to extract lithium from salt lake brine to produce lithium carbonate. However, due to technical problems that have not been resolved, the output has been very small: (1) Qinghai Lithium Industry adopts lithium ion membrane The separation method is a relatively successful lithium extraction process in China, but there are still Li + The disadvantage of low extraction efficiency (less than 70%); (2) Qinghai CITIC Guoan adopts the calcination method. Due to the proven shortcomings of high energy consumption, high pollution, and high cost, it is already in a state of semi-stop production; (3) Blu-ray Lithium Industry The aluminate adsorption process is still in the pilot stage due to the difficulty of the process, high loss rate of adsorbent, low direct yield, and high cost.

In general, several technological routes for extracting lithium from brine that have been put into practical use in my country all have common problems such as poor adsorption capacity, low recovery rate, and low product purity of the adsorbent, which not only raises higher requirements for the process and equipment characteristics of the upstream and downstream industrial chains. requirements, and because of the waste of resources due to the high lithium content in the tail liquid, it is difficult to commercialize and expand production capacity

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