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Iron phosphate ion sieve for selectively extracting Li and application thereof

A technology of ion sieve and iron phosphate, applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of large dissolution loss, short adsorbent life, unfavorable industrial application, etc., and achieve low production cost, low price, and easy industrialization The effect of production

Active Publication Date: 2011-05-11
江苏中南锂业有限公司
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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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  • Iron phosphate ion sieve for selectively extracting Li and application thereof
  • Iron phosphate ion sieve for selectively extracting Li and application thereof
  • Iron phosphate ion sieve for selectively extracting Li and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 100gFePO 4 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:

[0019]

[0020]

[0021] will be mixed with 100g FePO 4 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 FePO 4 In the ion sieve, the solid phase is LiFePO 4 , Li in solution + The concentration is reduced to 1.08g / L, FePO 4 The adsorption capacity of ion sieve to Li is about 35 mg / g; the filtered LiFePO 4 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 for 1 hour and then filter, LiFePO 4 Li in + Into the NaCl solution, the solid phase is transformed into FePO 4 Ion sieve, Li in delith...

Embodiment 2

[0023] 200g Al 0.02 Fe 0.98 PO 4 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 about 75min, the ion-exchange column leaks through; after washing the ion-exchange column with distilled water, use 2L of a solution containing 30g / LNaCl and 6g / L hydrogen peroxide to 100mL / min speed through the ion exchange column, oxidative desorption to obtain Li + 1L of solution with a concentration of 8.16g / L, Al 0.02 Fe 0.98 PO 4 The Li adsorption capacity of the ion sieve is about 40.8 mg / g.

Embodiment 3

[0025] 15gMn 0.02 Fe 0.98 PO 4 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:

[0026]

[0027]

[0028] 15g LiNi 0.02 Fe 0.98 PO 4 Place the lithium salt chamber in the electrodialysis device, add 100mL of 30g / L NaCl solution; separate the brine chamber and the lithium salt chamber with an anion exchange membrane, and use LiNi 0.02 Fe 0.98 PO 4 as the anode, Mn 0.02 Fe 0.98 PO 4 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 286mg / L, Mg 2+ The concentration is about 17993mg / L, Mn 0.02 Fe 0.98 PO 4 to Li + The adsorption capacity is about 28.5mg / g, for Mg 2+ The adsorption capacity is about 0.93mg / g; Li + The concentration is about 4.28g / L.

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Abstract

The invention relates to an iron phosphate ion sieve for selectively extracting Li and an application thereof. The iron phosphate ion sieve is one or a mixture of FePO4 and MexFeyPO4; Me is one of Mg, Al, Ti, Ni, Co, Mn, Mo and Nb or a mixture of several of Mg, Al, Ti, Ni, Co, Mn, Mo and Nb; and x is higher than 0 and lower than 1, and y is higher than 0 and lower than 1. The iron phosphate ion sieve is particularly suitable for the separation of Mg and Li in brine with a high Mg / Li ratio and has good Li<+> embedding and disembedding performances. Materials for preparing the iron phosphate ion sieve described by the invention are cheap, and easy to obtain, and the iron phosphate ion sieve has high selectivity and higher adsorption capacity for Li<+>, and can be used for more than 2000 times; and when being used for the separation between Mg and Li and the extraction of Li, the iron phosphate ion sieve has short process flow and low production cost, and is simple in operation and convenient for industrial application.

Description

technical field [0001] The invention belongs to the field of extraction metallurgy, and specifically relates to an iron phosphate ion sieve for separating magnesium and lithium in a lithium-containing solution or 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, ion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08C22B3/24C22B26/12
Inventor 赵中伟刘旭恒司秀芬陈爱良
Owner 江苏中南锂业有限公司
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