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Magnetic microporous lithium adsorbent and its preparation method and application

A lithium adsorption and microporous technology, which is applied in chemical instruments and methods, lithium compounds, and other chemical processes, can solve the problems of insignificant advantages in the adsorption capacity of adsorbents, insignificant advantages in specific surface area of ​​adsorbents, poor fluidity and permeability, etc. Problems, to achieve significant static adsorption capacity and dynamic working adsorption capacity, which is conducive to concentration and enrichment and subsequent utilization processing, and the effect of long cycle life

Active Publication Date: 2021-02-23
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

The disadvantage of this method in the application of the salt lake brine system is that if the adsorbent is not regenerated, the adsorption performance of the aluminum salt lithium adsorbent will decrease significantly after long-term operation. 3 After impregnation with lithium-containing solution, the advantage of imprinting effect is not obvious, and the static adsorption capacity and dynamic working adsorption capacity of the adsorbent synthesized by this method are quite different, and the advantage of dynamic adsorption is not obvious
[0007] The technical route of most of the adsorbent preparation methods in the prior art is: firstly synthesize and prepare Al(OH) 3 , and then impregnated with a lithium-containing solution to achieve the effect of template imprinting. The imprinting rate of this method is not complete, and the advantage of the adsorption capacity of the prepared adsorbent is not obvious. The preparation steps are many and the process is relatively complicated.
And the advantages of the adsorbent in terms of specific surface area and pore size are not obvious
At the same time, the adsorbent is in the form of powder, which has poor fluidity and permeability during the adsorption process. If it is to be used in production, it is first necessary to granulate the powder adsorbent, and the organic binder will block the pores of the adsorbent during the granulation process. The adsorption capacity of the adsorbent is greatly reduced

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  • Magnetic microporous lithium adsorbent and its preparation method and application
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  • Magnetic microporous lithium adsorbent and its preparation method and application

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preparation example Construction

[0025] As an aspect of the technical solution of the present invention, it relates to a preparation method of a magnetic microporous lithium adsorbent, comprising:

[0026] Using a surface modifier to modify the surface of the magnetic material to obtain a surface-modified magnetic material;

[0027] The soluble lithium salt, soluble aluminum salt and alkali are added to the alcohol dispersion of the surface-modified magnetic material for reaction, thereby preparing the magnetic microporous lithium adsorbent.

[0028] see figure 1 , is a schematic diagram of the synthesis process of the magnetic microporous lithium adsorbent, and in some embodiments, specifically includes:

[0029] The magnetic material is evenly dispersed in the alcohol solution containing the electrostatic stabilizer, and the surface modification agent is added for reaction, so as to obtain the magnetic material after the surface modification.

[0030] Further, the reaction temperature is 20-50°C.

[0031...

Embodiment 1

[0070] 5.0 g of magnetic Fe prepared by co-precipitation method 3 o 4 The particles were evenly dispersed into 80mL of ethanol solution containing 0.5% sodium acetate, and at 20°C, slowly added 0.58mL of 3-aminopropyltriethoxysilane and refluxed for 12h to obtain the surface-modified magnetic Fe 3 o 4 particle. Magnetic Fe 3 o 4 The particles were washed three times alternately with ethanol and deionized water. It was dispersed into 60 mL of ethanol solution containing sodium acetate. Lithium chloride and aluminum chloride solution were mixed uniformly according to the ratio of the amount of substances 0.6:1 and ultrasonically dispersed, then added dropwise at the speed of 200mL / h to the magnetic Fe 3 o 4 Particles in sodium acetate ethanol solution, wherein the ratio of the amount of sodium hydroxide to aluminum chloride is 3:1. During the dropwise addition process, mechanical stirring was performed at a stirring intensity of 250 rpm, and the dropwise addition was sto...

Embodiment 2

[0072] 5.0 g of magnetic CoFe prepared by co-precipitation method 2 o 4 The particles were evenly dispersed into 90 mL of ethanol solution containing 0.8% sodium acetate, and at 50 °C, 1.28 mL of Tween-80 was slowly added and then refluxed for 12 hours to obtain the surface-modified magnetic CoFe 2 o 4 particle. Magnetic CoFe 2 o 4 The particles were washed three times alternately with ethanol and deionized water. It was dispersed into 100 mL of ethanol solution containing sodium acetate. Lithium chloride and aluminum chloride solution were mixed uniformly according to the ratio of the amount of substances 0.85:1 and dispersed ultrasonically, then added dropwise to the magnetic CoFe at a rate of 300mL / h at the same time 2 o 4 The sodium acetate ethanol solution of the particles, wherein the ratio of the amount of sodium hydroxide to aluminum chloride is 3:1.03. During the dropwise addition, mechanically stir at a stirring intensity of 300 rpm, and stop the dropwise add...

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Abstract

The invention discloses a preparation method of a magnetic microporous lithium adsorbent, which comprises: modifying the surface of a magnetic material with a surface modifier to obtain a surface-modified magnetic material; The alcohol dispersion liquid of the modified magnetic material is reacted to prepare the magnetic microporous lithium adsorbent. The present invention can better control the specific surface area and pore size distribution of the adsorbent by controlling the drop rate of the soluble lithium salt and the pH of the reaction end point to obtain a microporous lithium adsorbent; after modifying the surface of the magnetic material, the lithium adsorbent can be stabilized grafted on the surface of the magnetic material to obtain a microporous magnetic lithium adsorbent. The adsorbent has magnetic properties, is convenient for solid-liquid separation in the adsorption-desorption process, does not require granulation, is loose and porous, has a large specific surface area, and has obvious advantages in static adsorption capacity and dynamic working adsorption capacity.

Description

technical field [0001] The invention relates to the technical field of selective separation of inorganic metal ions, in particular to a magnetic microporous lithium adsorbent and a preparation method and application thereof. Background technique [0002] Lithium is the lightest silver-white alkali metal with the smallest radius known so far. Lithium and its compounds have many unique and excellent properties and are widely used. They have been widely used in glass, ceramics, lubrication, electronics, metallurgy, medicine, refrigeration, aerospace and other industries and fields, and are known as "new energy in the 21st century". [0003] Lithium resources in nature mainly occur in seawater, salt lake brine, granite pegmatite deposits and geothermal water, among which brine lithium resources account for more than 80% of the total lithium resources. At the beginning of the 20th century, the production of refined lithium ore through pegmatite ores such as spodumene and lepidol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/04B01J20/28B01J20/30C01D15/00
CPCB01J20/0248B01J20/04B01J20/28009B01J20/3085C01D15/00
Inventor 郭敏吴志坚李权刘忠葛飞
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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