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Method for extracting lithium in seawater by utilizing Si-based mesoporous material

A silicon-based mesoporous material and seawater technology, applied in the field of lithium extraction, can solve the problems of time-consuming, labor-intensive, unsuitable for industrial production, etc., and achieve the effects of high efficiency, strong selectivity and strong controllability

Inactive Publication Date: 2017-05-31
DONGGUAN JIAQIAN NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solvent extraction method is more suitable for aqueous solutions with high lithium concentration. The lithium concentration in seawater is low. When performing solvent extraction, it needs to be concentrated in the early stage, which is time-consuming and laborious, so it is not suitable for industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for extracting lithium in seawater by using a silicon-based mesoporous material, comprising the following steps:

[0023] (1) Mix 15g of the SBA-15 type silicon-based mesoporous material with 60g of the catalyst, then grind and pulverize it, add it to 1L DMF dissolved with 10g of crown ether, mix well, add 10mL of triethylamine to it, Ultrasonic vibration was used to mix evenly, and then the reaction was continued for 12 hours at 70°C under the protection of an inert gas, and then filtered, washed repeatedly with absolute ethanol until neutral, and dried in vacuum to obtain a silicon-based mesoporous material grafted with crown ether. i.e. adsorbent;

[0024] (2) First filter 10L of seawater, heat it to 40°C in the reaction tank, add 8g of the adsorbent prepared in the previous step, stir and react for 6h, filter, collect the mesoporous material, and desorb.

[0025] The catalyst is a mixture of sodium carbonate and sodium iodide, the mass ratio is 2:5, and th...

Embodiment 2

[0027] A method for extracting lithium in seawater by using a silicon-based mesoporous material, comprising the following steps:

[0028] (1) Mix 15g of SBA-15 silicon-based mesoporous material with 90g of catalyst, grind and pulverize it, add it to 1.5L DMSO dissolved with 10g of crown ether, mix well, add 10mL of triethylamine to it , ultrasonically oscillated and mixed evenly, and then reacted continuously for 16 hours under the condition of 80°C under the protection of an inert gas, then filtered, washed repeatedly with absolute ethanol until neutral, and dried in vacuum to obtain a crown ether grafted silicon-based mesoporous material , that is, the adsorbent;

[0029] (2) First filter 10L of seawater, heat it to 50°C in the reaction tank, add 4g of the adsorbent prepared in the previous step, stir and react for 4h, filter, collect the mesoporous material, and desorb.

[0030] The catalyst is a mixture of sodium carbonate and sodium iodide, the mass ratio is 2:9, and the...

Embodiment 3

[0032] A method for extracting lithium in seawater by using a silicon-based mesoporous material, comprising the following steps:

[0033] (1) Mix 15g of SBA-15 silicon-based mesoporous material with 60g of catalyst, grind and pulverize it, add it to 1.5L THF dissolved with 10g of crown ether, mix well, add 15mL of triethylamine to it , ultrasonically oscillated and mixed evenly, and then reacted continuously for 16 hours at 70°C under the protection of an inert gas, then filtered, washed repeatedly with absolute ethanol until neutral, and dried in vacuum to obtain a crown ether grafted silicon-based mesoporous material , that is, the adsorbent;

[0034] (2) First filter 10L of seawater, heat it to 40°C in the reaction tank, add 8g of the adsorbent prepared in the previous step, stir and react for 4h, filter, collect the mesoporous material, and desorb.

[0035] The catalyst is a mixture of sodium carbonate and sodium iodide, the mass ratio is 2:9, and the crown ether is 4-ami...

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PUM

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Abstract

The invention discloses a method for extracting lithium in seawater by utilizing a Si-based mesoporous material. The method comprises the following steps: the seawater is filtered, the filtered seawater is heated to 40-50 degrees in a reaction tank, a prepared adsorbent is added, reaction under stirring is carried out for 4-6h, filtering is carried out, and the Si-based mesoporous material is collected and is subjected to desorption. The method is simple to operate, processing procedures are short, the lithium separation efficiency and the extraction speed are high, and the method is very suitable for large-scale industrialized production.

Description

technical field [0001] The invention relates to the field of lithium extraction, in particular to a method for extracting lithium in seawater by using a silicon-based mesoporous material. Background technique [0002] Lithium is the lightest metal in nature. It has high electrochemical potential and can form ionic bonds and covalent bonds. It is widely used in medicine, lubricants, refrigerants, ceramics, glass, battery industry, and aluminum smelting industry. Emerging fields such as industry and photoelectric industry have high practical value. With the continuous advancement of science and technology, the application of lithium and its compounds is becoming more and more extensive, and the demand for lithium in people's lives is also increasing year by year. [0003] The abundance of lithium is relatively large, ranking 27th in nature, and lithium only exists in nature in the form of compounds. Lithium resources in nature are mainly stored in granite pegmatite deposits,...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B3/24
CPCC22B3/24C22B26/12Y02P10/20
Inventor 王海燕
Owner DONGGUAN JIAQIAN NEW MATERIAL TECH CO LTD
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