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Microporous aluminum salt lithium adsorbent and preparation method thereof, filler and method for enriching lithium ions

A lithium adsorption and aluminum salt technology, applied in chemical instruments and methods, other chemical processes, alkali metal carbonates, etc., can solve the problems of insignificant imprinting effect, incomplete imprinting rate, complicated process, etc., and achieve selectivity Obvious advantages, long cycle life, simple preparation method

Active Publication Date: 2019-06-18
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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
[0009] The technical route of most of the above adsorbent preparation methods is to first 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
There are many preparation steps and the process is relatively complicated; and the adsorbent cannot meet the demand in terms of specific surface area and pore size

Method used

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  • Microporous aluminum salt lithium adsorbent and preparation method thereof, filler and method for enriching lithium ions
  • Microporous aluminum salt lithium adsorbent and preparation method thereof, filler and method for enriching lithium ions
  • Microporous aluminum salt lithium adsorbent and preparation method thereof, filler and method for enriching lithium ions

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Experimental program
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Effect test

Embodiment 1

[0045] At normal temperature, 3mol / L lithium hydroxide solution was added dropwise to 1mol / L aluminum chloride solution at a rate of 200mL / h, and the ratio of the two in the system was 3:1, and the stirring speed during the reaction was 500rpm, control the pH of the reaction end point to stop dripping at 6 o'clock, and continue to stir for 30 minutes to stop the experiment, after aging for 24 hours, the solid-liquid separation, the liquid continues to be used for the synthesis of subsequent adsorbents, and after the solid is re-slurried for 3 times, the re-slurry Pulp washing is well-known to those skilled in the art after beating with water; then drying at 50°C, grinding and sieving, and the obtained adsorbent LiCl 2Al(OH) 3 ·H 2 The average pore diameter of O is 1.7 nm. figure 1 with figure 2 It is the SEM image of the microporous aluminum salt lithium adsorbent and the adsorbent and LiCl 2Al(OH) 3 ·H 2 Standard XRD comparison chart of O.

[0046] The adsorbent is mixe...

Embodiment 2

[0048] At room temperature, add 2mol / L lithium hydroxide solution dropwise to 2mol / L aluminum sulfate solution at a rate of 200mL / h, so that the ratio of the two in the system is 3:1.02, and the stirring speed during the reaction is 800rpm , control the pH of the reaction end point to stop dropping at 7 o'clock, and continue to stir for 30 minutes before stopping the experiment. After aging for 24 hours, the solid-liquid separation, the liquid continues to be used for the synthesis of subsequent adsorbents, and the solid is re-slurried and washed for 3 times, and then dried at 50 ° C. , powdered and sieved, the obtained adsorbent LiCl·2Al(OH) 3 1.1H 2 The average pore diameter of O is 2 nanometers, and the adsorbent is mixed with the binder and compressed into tablets for granulation. After crushing and sieving, the adsorbent with a particle size of 0.9mm≤Dp≤2mm was packed into a column for dynamic adsorption experiments (length-to-diameter ratio: 1.82) for adsorption experim...

Embodiment 3

[0050] At room temperature, drop 3mol / L lithium hydroxide solution into 1.02mol / L aluminum nitrate solution at a rate of 200mL / h, and make the ratio of the two in the system 3:1.03, and the stirring speed during the reaction is 700rpm, control the pH of the reaction end point to stop dropping at 6 o'clock, and continue to stir for 30 minutes before stopping the experiment. After aging for 24 hours, the solid and liquid are separated, and the liquid continues to be used for the synthesis of subsequent adsorbents. dry, powdered and sieved, the obtained adsorbent LiCl 2Al(OH) 3 0.9H 2 The pore diameter of O is 1.8 nanometers, and the adsorbent is mixed with the binder and compressed into tablets for granulation. After crushing and sieving, the adsorbent with a particle size of 0.9mm≤Dp≤2mm was packed into a column for dynamic adsorption experiments (length-to-diameter ratio: 2.16) for adsorption experiments. The concentrated brine containing lithium 3g / L of the adsorbent is use...

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Abstract

The invention discloses a microporous aluminum-salt lithium adsorbent, a preparation method therefor, filler containing the microporous aluminum-salt lithium adsorbent and a lithium ion enriching method. The microporous aluminum-salt lithium adsorbent disclosed by the invention has the molecular formula of LiCl.aAl(OH)3.bH2O and has micropores, of which the average pore size is smaller than 2nm, wherein a is greater than 1 and smaller than 3, and b is greater than 0.5 and smaller than 2. The preparation method disclosed by the invention is simple, and the obtained adsorbent is large in lithium ion adsorption capacity, high in selectivity, simple in eluting regeneration and long in cycle life and can be applied to the separation and extraction of lithium from lithium-containing saline lake brine, salt-field concentrated lithium-containing senescent brine, lithium-containing medicinal wastewater and a lithium-containing solution with the mineralization degree lower than 50g / L.

Description

technical field [0001] The invention relates to the technical field of selective separation of inorganic metal ions, in particular to a microporous aluminum salt lithium adsorbent and a preparation method thereof, a filler containing the microporous aluminum salt lithium adsorbent and a method for enriching lithium ions. 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 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 productio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/04B01J20/28B01J20/30C01D3/04C01D7/22
CPCB01J20/0248B01J20/04B01J20/28054B01J20/28057B01J2220/4806C01D3/04C01D7/22
Inventor 郭敏吴志坚周园李权封志芳张慧芳
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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