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Method for extracting lithium from salt lake brine by adsorption method

A salt lake brine and adsorption technology, applied in the field of lithium extraction, can solve the problems of low lithium ion adsorption efficiency and high production cost, and achieve the effects of simple preparation method, low price and improved adsorption capacity

Active Publication Date: 2012-12-12
SUNRESIN NEW METERIALS CO LTD XIAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lithium ion adsorption efficiency of this method is low, so the production cost is high

Method used

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  • Method for extracting lithium from salt lake brine by adsorption method
  • Method for extracting lithium from salt lake brine by adsorption method
  • Method for extracting lithium from salt lake brine by adsorption method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The preparation method of aluminum-containing salt type adsorption resin is as follows:

[0041] (1) Insert LiCl into Al(OH) 3 The reaction produces the insertion formula LiCl·2Al(OH) 3 ·nH 2 O compound;

[0042](2) Use the fluororesin high molecular polymer as the binder, dissolve it in the volatile organic solvent toluene at a weight ratio of 1:3, and then add the plug-in LiCl 2Al(OH ) 3 ·nH 2 O compound, then pelletized and the solvent removed to produce an aluminum salt-type adsorption resin.

[0043] Adsorbent filling: take 500ml of the above-mentioned aluminum-containing salt-type adsorbent resin and put it into the measuring cylinder 3 (denoted as 1BV), and then put the measuring cylinder 3 into the stainless steel column 4 with a jacket of Φ30*1000mm;

[0044] Adsorbent pretreatment: take 10BV deionized water, wash with 4BV / H until the conductance of the water out of the detection outlet is between 20-30us.

[0045] The method of extracting lithium from s...

Embodiment 2

[0060] The preparation method of aluminum-containing salt type adsorption resin is as follows:

[0061] (1) Insert LiCl into Al(OH) 3 The reaction produces the insertion formula LiCl·2Al(OH) 3 ·nH 2 O compound;

[0062] (2) Polyvinyl chloride macromolecular polymer is used as binder, and is dissolved in easily volatile organic solvent benzene by weight ratio 1: 15, then adds plug-in type LiCl 2Al ( Oh) 3 ·nH 2 O compound, then pelletized and the solvent removed to produce an aluminum salt-type adsorption resin.

[0063] The temperature control in the loading of adsorbent, adsorbent pretreatment and adsorption process is the same as embodiment 1;

[0064] The brine for adsorption contains Li: 250-300mg / l, Mg: 200-300g / l, density 1.13g / l, Baume degree 33-35, PH: 6.8.

[0065] (1) Adsorb lithium ions in salt lake brine with adsorption resin

[0066] Temperature control: The feed liquid is heated by a water bath to maintain a constant temperature, and the jacket uses a sel...

Embodiment 3-10

[0078] Except that temperature conditions and flow rates are different, all the other steps and conditions are the same as in Example 2. The specific temperature, flow rates and yields are shown in Table 1.

[0079] Table 1

[0080] Example serial number

temperature(℃)

Velocity(BV / H)

Adsorption capacity

Lithium yield

Example 2

20

5

1.98

59.3％

[0081] Example 3

30

5

2.53

61.7％

Example 4

40

5

3.02

73.6％

Example 5

50

5

3.11

74.9％

Example 6

60

5

3.87

78.7％

Example 7

70

5

4.02

90.1％

Example 8

80

5

4.48

91.9％

Example 9

90

5

4.53

95.8％

Example 10

100

5

4.71

98.7％

[0082] The temperature-adsorption capacity curve of embodiment 2-embodiment 10 sees figure 2 ,Depend on...

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Abstract

The invention discloses a method for extracting lithium from salt lake brine by an adsorption method. The method comprises the following steps of: (1) making the salt lake brine pass through aluminum salt-containing adsorption resin at a speed of between 5 and 10 BV / H at the temperature of between 20 and 100 DEG C to ensure that the lithium ions in the salt lake brine are adsorbed on the adsorption resin; (2) making lithium ion eluant pass through the aluminum salt-containing adsorption resin at a speed of between 5 and 10 BV / H at the temperature of between 20 and 100 DEG C to ensure that thelithium ions adsorbed on the aluminum salt-containing adsorption resin are eluted and desorbed into the eluant solution so as to obtain desorption liquid; and (3) making the desorption liquid pass through common sodium cation exchange resin at a speed of between 5 and 10 BV / H to remove magnesium from the desorption liquid, and then concentrating to obtain a lithium salt. The method has the advantages of low consumption of chemical materials, simple process, easy operation and no pollution.

Description

technical field [0001] The invention relates to a method for extracting lithium from salt lake brine, in particular to a method for extracting lithium carbonate from lithium-containing salt lake brine with a high magnesium-lithium ratio (500<Mg / Li<1800) and concentrated lithium-containing old brine in salt fields . Background technique [0002] Lithium metal and its compounds have great application prospects in energy and new materials. Lithium extraction from salt lake brine will become the main direction of lithium salt production in the 21st century. Lithium resources in nature mainly occur in granite pegmatite deposits, salt lake brine, sea water and geothermal water. According to statistics, the reserves of lithium resources in salt lake brine account for about 70-80% of the total amount of lithium resources. Therefore, the extraction of lithium from salt lake brine will become the main way of lithium salt production. The lithium salt products (calculated as lith...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/24C22B26/12
CPCY02P10/20
Inventor 寇晓康王刚刘金华
Owner SUNRESIN NEW METERIALS CO LTD XIAN
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