US-12616952-B2 - Aluminum base lithium ion adsorbent, method for preparing same by liquid-phase precipitation

US12616952B2US 12616952 B2US12616952 B2US 12616952B2US-12616952-B2

Abstract

A lithium ion adsorbent includes a material having a chemical formula of LiCl·2Al(OH) 3 ·nH 2 O. n is an integer from 1 to 3, a specific surface area of the lithium ion adsorbent is 20-36 m 2 /g, an average pore diameter of the lithium ion adsorbent is 20-35 nm, a total pore volume of the lithium ion adsorbent is 0.15-0.32 mL/g, a D10 of the lithium ion adsorbent is 3-12 μm, a D50 of the lithium ion adsorbent is 12-22 μm, and a D90 of the lithium ion adsorbent is 20-40 μm.

Inventors

Minghao Wang
Junlan Lian
Hongye LIN

Assignees

BYD COMPANY LIMITED

Dates

Publication Date: 20260505
Application Date: 20220309
Priority Date: 20210918

Claims (4)

1 . A lithium ion adsorbent, comprising: a material having a chemical formula of LiCl·2Al(OH) 3 ·nH 2 O, wherein: n is an integer from 1 to 3; a specific surface area of the lithium ion adsorbent is 20-36 m 2 /g; an average pore diameter of the lithium ion adsorbent is 20-35 nm; a total pore volume of the lithium ion adsorbent is 0.15-0.32 mL/g; a D10 of the lithium ion adsorbent is 3-12 μm; a D50 of the lithium ion adsorbent is 12-22 μm; and a D90 of the lithium ion adsorbent is 20-40 μm.
2 . The lithium ion adsorbent of claim 1 , wherein: the specific surface area of the lithium ion adsorbent is 33-36 m 2 /g; the average pore diameter of the lithium ion adsorbent is 22-24 nm; the total pore volume of the lithium ion adsorbent is 0.28-0.32 mL/g; the D10 of the lithium ion adsorbent is 3-6 μm; the D50 of the lithium ion adsorbent is 12-16 μm; and the D90 of the lithium ion adsorbent is 20-29 μm.
3 . The lithium ion adsorbent of claim 1 , wherein: a lithium ion adsorption capacity of the lithium ion adsorbent is 3-10 mg/g; a lithium ion desorption rate of the lithium ion adsorbent is 95-100%; when the lithium ion adsorbent is used for adsorbing lithium ions in a brine including magnesium and lithium, a ratio of a mass ratio of magnesium to lithium in the brine to a mass ratio of magnesium to lithium in a desorption solution is 18-68:1; a content of the material having the chemical formula of LiCl·2Al(OH) 3 ·nH 2 O in the lithium ion adsorbent is 95-100% by weight.
4 . A lithium ion adsorbent, comprising: a material having a chemical formula of LiCl·2Al (OH) 3 ·nH 2 O, wherein: n is an integer from 1 to 3: a specific surface area of the lithium ion adsorbent is 20-36 m/g; an average pore diameter of the lithium ion adsorbent is 20-35 nm; a total pore volume of the lithium ion adsorbent is 0.15-0.32 mL/g; a D10 of the lithium ion adsorbent is 3-12 μm; a D50 of the lithium ion adsorbent is 12-22 μm; and a D90 of the lithium ion adsorbent is 20-40 μm, wherein; a lithium ion adsorption capacity of the lithium ion adsorbent is 3-10 mg/g; a lithium ion desorption rate of the lithium ion adsorbent is 95-100%; when the lithium ion adsorbent is used for adsorbing lithium ions in a brine including magnesium and lithium, a ratio of a mass ratio of magnesium to lithium in the brine to a mass ratio of magnesium to lithium in a desorption solution is 18-68:1; a content of the material having the chemical formula of LiCl·2Al(OH) 3 ·nH 2 O in the lithium ion adsorbent is 95-100% by weight, and wherein: the lithium ion adsorption capacity of the lithium ion adsorbent is 8-10 mg/g; the lithium ion desorption rate of the lithium ion adsorbent is 98-99%.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202111101864.9, entitled “ALUMINUM BASE LITHIUM ION ADSORBENT, METHOD FOR PREPARING THE SAME BY LIQUID-PHASE PRECIPITATION” filed with the China National Intellectual Property Administration on Sep. 18, 2021, which is incorporated by reference in its entirety. FIELD The disclosure relates to the field of chemistry, and in particular, to an aluminum base lithium ion adsorbent and a method for preparing the same by liquid phase precipitation. BACKGROUND At present, there are mainly three methods for preparing an aluminum base lithium ion adsorbent. In a first method, a mixture of AlCl3 and LiCl solutions is slowly added into a NaOH solution and reacted to form Al(OH)3, where Li+ is embedded in the interlayer of Al(OH)3 to form LiCl·2Al(OH)3·nH2O. Although the adsorption capacity of the adsorbent prepared by this method is acceptable, three raw materials are needed for synthesis, and NaOH is a strong base, which leads to high difficulty in controlling the Al(OH)3 formation process and imposes high requirements on the control of the pH value, resulting in complex operations and making it difficult to achieve large-scale industrial production. In a second method, a mixture of AlCl3 and LiCl solutions is added to a bicarbonate solution, and through the hydrolysis of bicarbonate and aluminum ions, an aluminum ion adsorbent is generated in one step, which is reacted by heating to obtain a suspension containing LiCl·2Al(OH)3·nH2O. Then solid-liquid separation is performed to obtain the adsorbent. This method also requires three raw materials for synthesis, and a large amount of CO2 is emitted during the synthesis process, leading to high carbon emission. In a third method, Al(OH)3 particles are placed in a LiOH solution, so that LiOH infiltrates into the gaps of the Al(OH)3 particles. Then HCl is added to adjust the pH value of the solution. Finally, LiCl·2Al(OH)3·nH2O is formed after aging treatment. The adsorbent prepared by this method has low adsorption capacity and low desorption efficiency, and requires higher temperature and longer time for desorption. Therefore, the lithium ion adsorption capacities of the adsorbents obtained by the above methods are still low. SUMMARY An objective of the disclosure is to provide a lithium ion adsorbent and a method for preparing the same. This method can overcome the problem of low lithium ion adsorption capacity in the related art. The inventors of the disclosure found that the adsorbent precursor can be synthesized by a one-step method of liquid phase precipitation and the synthesis process is simple and suitable for industrial production, and thus obtained the disclosure. In order to achieve the above objective, a first aspect of the disclosure provides a lithium ion adsorbent, which includes a material having a chemical formula of LiCl·2Al(OH)3·nH2O, where n is an integer from 1 to 3. A specific surface area of the lithium ion adsorbent is 20-36 m2/g. An average pore diameter of the lithium ion adsorbent is 20-35 nm. A total pore volume of the lithium ion adsorbent is 0.15-0.32 mL/g. A D10 of the lithium ion adsorbent is 3-12 μm. A D50 of the lithium ion adsorbent is 12-22 μm. A D90 of lithium ion adsorbent is 20-40 μm. According to some embodiments of the disclosure, the specific surface area of the lithium ion adsorbent is 33-36 m2/g. According to some embodiments of the disclosure, the average pore diameter of the lithium ion adsorbent is 22-24 nm. According to some embodiments of the disclosure, the total pore volume of the lithium ion adsorbent is 0.28-0.32 mL/g. According to some embodiments of the disclosure, the D10 of the lithium ion adsorbent is 3-6 μm. According to some embodiments of the disclosure, the D50 of the lithium ion adsorbent is 12-16 μm. According to some embodiments of the disclosure, the D90 of the lithium ion adsorbent is 20-29 μm. According to some embodiments of the disclosure, a lithium ion adsorption capacity of the lithium ion adsorbent is 3-10 mg/g; a lithium ion desorption rate of the lithium ion adsorbent is 95-100%. According to some embodiments of the disclosure, the lithium ion adsorption capacity of the lithium ion adsorbent is 8-10 mg/g. According to some embodiments of the disclosure, the lithium ion desorption rate of the lithium ion adsorbent is 98-99%. When the lithium ion adsorbent is used for adsorbing lithium ions in a brine including magnesium and lithium, a ratio of a mass ratio of magnesium to lithium in the brine to a mass ratio of magnesium to lithium in a desorption solution is 18-68:1; a content of the material having the chemical formula of LiCl·2Al(OH)3·nH2O in the lithium ion adsorbent is 95-100% by weight. A second aspect of the disclosure provides a method for preparing a lithium ion adsorbent, including the following steps: S1, adding a lithium salt solution to a metaaluminate solution or adding the metaalu