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Porous doped titanium-based lithium adsorbent and preparation method thereof

A technology of lithium adsorption and titanium series, which is applied in the field of positive electrode material preparation, can solve the problems of slow adsorption and desorption rate, influence on practical application, and low efficiency of industrial lithium recovery, and achieve the effect of simple and convenient operation, reduced cost and excellent performance

Active Publication Date: 2021-04-27
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the slow adsorption and desorption rate, the efficiency of industrial lithium recovery is not high, which affects its practical application.

Method used

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  • Porous doped titanium-based lithium adsorbent and preparation method thereof
  • Porous doped titanium-based lithium adsorbent and preparation method thereof
  • Porous doped titanium-based lithium adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] In this example, the porous doped titanium-based lithium adsorbent was prepared by the following steps:

[0051] (1) Take the M salt and lithium source press with a molar ratio of 1:0.04, add it to absolute ethanol and grind to form a suspension; wherein M n+ for Zn 2+ , the M salt is zinc acetate, and the lithium source is lithium acetate;

[0052] 2) Put the suspension obtained in step (1) into an oven and heat at 60°C for 0.5h to obtain a mixture of molten lithium acetate and zinc acetate;

[0053] 3) in step (2) gained molten state liquid press titanium source mole fraction and M n+ The sum of mole fractions is 1 and the mass ratio of nitrogen-containing surfactant and lithium source: 1:0.4 Add metatitanic acid (hydrated titanium dioxide) and nitrogen-containing surfactant, grind evenly and then dry, the nitrogen-containing surfactant is Dodecyltrimethylammonium bromide;

[0054] 4) Sintering at a temperature of 700° C. for 4 hours in an air environment to obtai...

Embodiment 2

[0057] This embodiment is basically the same as Embodiment 1, except that in step 1, the molar ratio of the M salt to the lithium source is different, and the rest are the same settings.

[0058] In this example, the porous doped titanium-based lithium adsorbent was prepared by the following steps:

[0059] (1) Take the M salt and lithium source press with a molar ratio of 1:0.02, add it to absolute ethanol and grind to form a suspension, the M n+ for Zn 2+ , the M salt is zinc acetate, and the lithium source is lithium acetate;

[0060] (2) Put the suspension obtained in step (1) into an oven and heat at 60°C for 0.5h to obtain a mixture of molten lithium acetate and zinc acetate;

[0061] (3) in step (2) gained molten state liquid press titanium source molar fraction and M n+ The sum of mole fractions is 1 and the mass ratio of nitrogen-containing surfactant and lithium source is 1:0.4. Add metatitanic acid (hydrated titanium dioxide) and nitrogen-containing surfactant, g...

Embodiment 3

[0065] This embodiment is basically the same as Embodiment 1, except that in step 1, the molar ratio of the M salt to the lithium source is different, and the rest are the same settings.

[0066] In this example, the porous doped titanium-based lithium adsorbent was prepared by the following steps:

[0067] (1) Take the M salt and lithium source press with a molar ratio of 1:0.1, add it to absolute ethanol and grind to form a suspension, the M n+ for Zn 2+ , the M salt is zinc acetate, and the lithium source is lithium acetate;

[0068] (2) Put the suspension obtained in step (1) into an oven and heat at 60°C for 0.5h to obtain a mixture of molten lithium acetate and zinc acetate;

[0069] (3) in step (2) gained molten state liquid press titanium source molar fraction and M n+ The sum of mole fractions is 1 and the mass ratio of nitrogen-containing surfactant and lithium source is 1:0.4. Add metatitanic acid (hydrated titanium dioxide) and nitrogen-containing surfactant, gr...

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Abstract

The invention discloses a porous doped titanium-based lithium adsorbent and a preparation method thereof, and relates to the technical field of preparation of lithium adsorbents. According to the porous doped titanium-based lithium adsorbent, a rapid and efficient lithium adsorption effect is achieved by regulating and controlling the types and the amount of substances of a lithium source, a nitrogen-containing surfactant and doped elements. According to the invention, through the modification method, raw materials can be fully and uniformly mixed, an adsorption effect is enhanced, a titanium-based lithium adsorbent precursor can be obtained through high-temperature sintering, and the lithium ions in the titanium-based lithium adsorbent precursor are removed through acid pickling so as to obtain the porous doped titanium-based lithium adsorbent; and the macropores of the porous doped titanium-based lithium adsorbent can effectively improve the wettability of the material, N doping provides rich nitrogen functional groups for the adsorbent, the adsorption effect of the adsorbent is improved, metal ion doping facilitates expansion of an internal lithium ion diffusion channel, the internal and external diffusion rate of the adsorbent is increased, and the adsorption capacity of the adsorbent is improved, so that the adsorption capacity and dynamic characteristics of the adsorbent are enhanced.

Description

technical field [0001] The invention relates to the field of positive electrode material preparation, in particular to a porous doped titanium series lithium adsorbent and a preparation method thereof. Background technique [0002] Lithium, as the lightest alkali metal, plays an increasingly important role in ceramics, man-made glass, thermonuclear fusion, grease, refrigerant, and especially rechargeable batteries. However, due to the recent depletion of lithium mineral ores, lithium extraction from brine and seawater has received increasing attention. [0003] Currently, some techniques for recovering lithium from brine have been developed, such as solar evaporation, co-precipitation, electrochemical techniques, solvent extraction, ion exchange adsorption. However, most of them have their own limitations and have complicated preparation procedures. Lithium adsorbents have been extensively studied due to their high lithium selectivity and high recovery. However, due to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/04B01J20/30
CPCB01J20/04
Inventor 张云王倩吴昊蒲星宏
Owner SICHUAN UNIV
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