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Ion sieve for selectively extracting lithium and application thereof

A technology for ion sieving and lithium extraction, applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of large dissolution loss, short life of adsorbent, unfavorable industrial application, etc., achieve low production cost, solve the separation of magnesium and lithium, Ease of industrial production

Active Publication Date: 2012-08-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is well known that ion sieve oxides have a large dissolution loss in the process of acid elution, resulting in short life of the adsorbent, which is not conducive to large-scale industrial applications.

Method used

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  • Ion sieve for selectively extracting lithium and application thereof
  • Ion sieve for selectively extracting lithium and application thereof
  • Ion sieve for selectively extracting lithium and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 100g Li 4 Ti 5 o 12 The ion sieve is placed in 50L of a salt lake brine. The main components and contents of the brine are shown in the following table:

[0016]

[0017] will be mixed with 100gLi 4 Ti 5 o 12 The 50L salt lake brine of the ion sieve was heated and stirred, and the temperature of the solution was controlled at 80°C; 50mL of 10% hydrazine aqueous solution was slowly added dropwise, stirred and reacted for 1h, and then filtered, the Li in the brine + Enter Li 4 Ti 5 o 12 In the ion sieve, the solid phase is gradually transformed into Li 7 Ti 5 o 12 , Li in solution + The concentration of Li was reduced to 1.09g / L, Li 4 Ti 5 o 12 The adsorption capacity of ion sieve to Li is about 30mg / g; 7 Ti 5 o 12 Place in 1L of 10% NaCl solution for heating and stirring, control the temperature of the solution at 40°C, slowly add 25mL of 25% hydrogen peroxide dropwise, stir and react for 1h and then filter, Li 7 Ti 5 o 12 Li in + Into the NaCl so...

Embodiment 2

[0019] 200g Li 4 Ti 4.98 Zr 0.02 o 12 The ion sieve material was loaded into an ion exchange column, and a mixed solution was prepared with 90 mL of 10% hydrazine aqueous solution and 20 L of salt lake brine. The main components and contents of the salt lake brine were the same as in Example 1. Pass the mixed solution through the ion-exchange column at a speed of 100mL / min; after the ion-exchange column leaks through, wash the ion-exchange column with distilled water, and then use 2L of a solution containing 30g / LNaCl and 6g / L hydrogen peroxide at a rate of 100mL / min Speed ​​through the ion exchange column, oxidative desorption to obtain Li + Concentration is 6.46g / L solution 1L, Li 4 Ti 4.98 Zr 0.02 o 12 The Li adsorption capacity of the ion sieve is about 32.3 mg / g.

Embodiment 3

[0021] 20gLi 3.95 Nb 0.01 Ti 5 o 12 The ion sieve is placed in the brine chamber of the electrodialysis device, and 2L of a certain salt lake brine is added. The composition and content of the salt lake brine are shown in the following table:

[0022]

[0023] Add 100mL of 30g / L NaCl solution into the lithium salt chamber in the electrodialysis device, and the brine chamber and the lithium salt chamber are separated by an anion exchange membrane; with graphite as the anode, Li 3.95 Nb 0.01 Ti 5 o 12 As the cathode, a voltage of 0.8V is applied across the electrodes, and after maintaining for 15h, the Li in the brine chamber + Concentration decreased to 259mg / L, Mg 2+ The concentration is about 17993.8mg / L, Li 3.95 Nb 0.01 Ti 5 o 12 to Li + The adsorption capacity is about 24.1mg / g, for Mg 2+ The adsorption capacity is about 0.62mg / g.

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Abstract

The invention relates to an ion sieve for selectively extracting lithium and the application thereof. The ion sieve adopts one or the compound of more than one of the following components: Li4Ti5O12, LixMeyTi5O12, and Li4MemTinO12, wherein Me is one or the compound of more than one of the following components: V, Fe, Co, Mn, Al, Ba, Ag, Zr, and Nb, x is greater than 3 and smaller than 4, y is greater than 0 and smaller than 1, m is greater than 0 and smaller than 1, and n is greater than 4 and smaller than 5. The ion sieve is particularly applicable to magnesium and lithium separation in brine with a high magnesium / lithium ratio, and has favorable intercalation and deintercalation performances to Li ions. The material for the titanic acid lithium ion sieve provided by the invention is easy to get and low in cost, the ion sieve has high selectivity and higher adsorptive capacity to the Li ions, as well as long circulating life. The process adopting the titanic acid lithium ion sieve toperform magnesium and lithium separation has the advantages of short procedure, simplicity in operation, low manufacturing cost, and easiness in industrial application.

Description

technical field [0001] The invention belongs to the field of extraction metallurgy, and specifically relates to a lithium titanate ion sieve for separating magnesium and lithium in a lithium-containing solution or a salt lake brine and efficiently extracting lithium and an application thereof. Background technique [0002] Lithium metal is the lightest metal discovered so far, and it is widely used in energy, chemical industry, metallurgy and other fields. With the increasingly prominent energy issues, lithium-ion batteries have developed rapidly, and lithium and its compounds occupy an irreplaceable position. There are very rich lithium resources in brines, such as salt lakes and underground brines, which contain a large amount of lithium resources. At present, lithium in brines in the world is mostly extracted in the form of lithium carbonate or lithium chloride, and the methods used mainly include solvents. Extraction method, precipitation method, carbonization method, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/08C22B3/24C22B26/12
Inventor 赵中伟刘旭恒司秀芬陈爱良
Owner CENT SOUTH UNIV
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