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Preparation method of magnetic aluminum salt lithium adsorbent

A lithium adsorption and aluminum salt technology, applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problem that powder adsorbents cannot be directly applied to large-scale continuous industrial production and liquid fluidity And problems such as poor permeability and immature molding technology, to achieve the effect of simple and reasonable preparation method, mild overall conditions and easy control

Inactive Publication Date: 2020-01-03
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

However, if the powder aluminum salt lithium adsorbent is filled in the adsorption bed without treatment, the liquid fluidity and permeability will be poor, and the solid-liquid separation will be difficult. Therefore, the powder adsorbent cannot be directly applied to large-scale continuous industrial production.
In order to solve this problem, organic binders are generally used to shape and granulate the powder, but a large number of experimental results show that the adsorption capacity of the adsorbent after granulation drops sharply, only 2-3mg / g, and the molding technology is not yet mature. , there is still a slight loss during the adsorption-desorption process

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  • Preparation method of magnetic aluminum salt lithium adsorbent
  • Preparation method of magnetic aluminum salt lithium adsorbent
  • Preparation method of magnetic aluminum salt lithium adsorbent

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preparation example Construction

[0026] like figure 1 As shown, the invention discloses a preparation method of a magnetic aluminum salt lithium adsorbent, comprising the following steps:

[0027] Step 1, dissolving soluble lithium salt and aluminum salt in deionized water to prepare lithium-aluminum mixed solution;

[0028] Step 2, adding magnetic nanoparticles to deionized water to obtain a magnetic nucleus suspension;

[0029] Step 3, under stirring conditions, add alkali solution and lithium-aluminum mixed solution to the magnetic nucleus suspension, control the end point pH value to 3-12, preferably the end point pH value is 4.5;

[0030] Step 4, stop stirring, and then obtain the precursor solution after aging and hydrothermal reaction in sequence;

[0031] In step 5, the solid product is separated from the precursor solution, and the solid product is washed with an organic solvent, dried, ground, washed with deionized water, and dried in order to finally obtain a magnetic aluminum salt lithium adsorb...

Embodiment 1

[0047] Weigh 19.57g AlCl respectively 3 ·6H 2 O and 1.86g LiCl·H 2 O was dissolved in 80mL of deionized water, ultrasonically treated at 60°C for 60 minutes and mixed evenly to prepare a lithium-aluminum mixed solution with Li / Al=0.8 / 2, in which the lithium ion concentration was 0.4mol / L and the aluminum ion concentration was 1.0mol / L. 1.20g Fe prepared by co-precipitation method 3 o 4 Add the solid powder into 100mL deionized water, and ultrasonically disperse at 50°C for 60min. to Fe 3 o 4 20mL NaOH solution with a concentration of 8mol / L was added to the suspension, and the lithium-aluminum mixed solution was added dropwise into the reaction kettle at a dropping rate of 5mL / min. The pH at the end of the addition was 4.5. After the reaction was completed, it was aged at 45°C for 2 hours. After the aging, the reaction system was transferred to a polytetrafluoroethylene hydrothermal kettle, and the hydrothermal reaction was carried out at 160°C for 24 hours. The obtai...

Embodiment 2

[0049] Weigh 19.57g AlCl respectively 3 ·6H 2 O and 1.86g LiCl·H 2 O was dissolved in 80mL of deionized water, ultrasonically treated at 60°C for 60 minutes and mixed evenly to prepare a lithium-aluminum mixed solution with Li / Al=0.8 / 2, in which the lithium ion concentration was 0.4mol / L and the aluminum ion concentration was 1.0mol / L. 2.40g Fe prepared by co-precipitation method 3 o 4 Add the solid powder into 100mL deionized water, and ultrasonically disperse at 50°C for 60min. to Fe 3 o 4 20mL NaOH solution with a concentration of 8mol / L was added to the suspension, and the lithium-aluminum mixed solution was added dropwise into the reaction kettle at a dropping rate of 5mL / min. The pH at the end of the addition was 4.5. After the reaction was completed, it was aged at 45°C for 2 hours. After the aging, the reaction system was transferred to a polytetrafluoroethylene hydrothermal kettle, and the hydrothermal reaction was carried out at 160°C for 24 hours. The obtai...

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Abstract

The invention discloses a preparation method of a magnetic aluminum salt lithium adsorbent, which comprises the following steps of: preparing a lithium-aluminum mixed solution; preparing a magnetic core suspension; adding alkali solution and lithium-aluminum mixed solution to the magnetic core suspension to obtain a precursor solution; successively subjecting the solid products in the precursor solution to washing by organic solvent, drying, grinding, washing by deionized water and drying to finally obtain the magnetic aluminum salt lithium adsorbent. The preparation method of the magnetic aluminum salt lithium adsorbent is simple, the time consumption is short, the cost is low, the obtained magnetic aluminum salt lithium adsorbent retains the adsorption capacity of the lithium aluminum layered double hydroxide namely the aluminum salt lithium adsorbent. The invention can be applied to extract lithium resources from lithium-containing solutions with high magnesium-lithium ratio and lowlithium concentration, and has good magnetism, can be quickly separated from the solution under the action of an external magnetic field, is convenient for recovery and recycling, and avoids the problems of difficult separation and recovery of powder adsorbent in the application process, sharp decline in adsorption performance caused by molding and granulation, etc.

Description

technical field [0001] The invention relates to a method for preparing an adsorbent, in particular to a method for preparing a magnetic aluminum salt lithium adsorbent, and belongs to the technical field of inorganic adsorbent preparation. Background technique [0002] Lithium, as one of the important rare metal elements, has been widely used in many industries and fields such as batteries, ceramics, glass, grease, metallurgy, and atomic energy thermonuclear fusion. [0003] In nature, lithium resources mainly occur in granite pegmatite lithium deposits and salt lake brine. At present, only a few countries have solid lithium mines with commercial development value, while lithium ore extraction in my country is limited by low average ore grade, small resource reserves, high mining costs, relatively backward mining and dressing technology, and serious environmental pollution. Relying only on mining Ore production and processing of lithium products can no longer meet the needs ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/28B01J20/30
CPCB01J20/02B01J20/046B01J20/06B01J20/08B01J20/28009B01J2220/42
Inventor 林森陈君宋兴福于建国
Owner EAST CHINA UNIV OF SCI & TECH
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