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A method for extracting lithium from lithium-containing brine

A technology for extracting lithium and brine, which is applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of high cost and complex lithium extraction process, and achieve the effects of low cost, no need for repeated enrichment, and short process

Active Publication Date: 2017-12-08
李震祺 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method for extracting lithium from lithium-containing brine, aiming to solve the problems of complex and high-cost lithium extraction process from lithium-containing brine

Method used

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  • A method for extracting lithium from lithium-containing brine
  • A method for extracting lithium from lithium-containing brine
  • A method for extracting lithium from lithium-containing brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 10g of MnO with lithium intercalation activity 2 After being acidified with 0.01mol / L hydrochloric acid for 0.5h, it was loaded into the adsorption column, and 1L of lithium-containing salt lake brine was added. The composition of the lithium-containing salt lake brine is shown in Table 1. + Concentration dropped to 104mg / L, Mg 2+ Concentration dropped to 15983.7mg / L, lithium intercalation active MnO 2 to Li + The adsorption capacity is 59.6 mg / g, for Mg 2+ The adsorption capacity is 1.63 mg / g, and then the lithium-absorbed Li X mn 2 o 4 (X=0.74), after washing and drying at 120°C, heat treatment in a muffle furnace at 500°C for 3 hours;

[0045] Table 1. Lithium-containing salt lake brine composition list

[0046]

[0047] The heat-treated Li X mn 2 o 4 (X=0.74), conductive carbon black, and CMC are mixed according to the mass ratio of 94:1:5, stirred in deionized water to form a slurry, and then sprayed on a perforated aluminum strip to make a flexible el...

Embodiment 2

[0049] 5 g of FePO with lithium intercalation activity 4 After being acidified with 1mol / L sulfuric acid for 0.1h, it was loaded into the adsorption column, and 1L of lithium-containing salt lake brine was added. The composition of the lithium-containing salt lake brine is shown in Table 2. + Concentration dropped to 52mg / L, Mg 2+ The concentration is reduced to 1297.3mg / L, and lithium-intercalation active FePO 4 to Li + The adsorption capacity is 33.6 mg / g, for Mg 2+ The adsorption capacity is 0.54 mg / g, and then the lithium-absorbed Li X FePO 4 (X=0.727), after washing and drying at 80℃, in N 2 Heat treatment at 400°C for 6 hours in a muffle furnace under atmosphere;

[0050] Table 2. Lithium-containing salt lake brine composition list

[0051]

[0052] The heat-treated Li X FePO 4 (X=0.727), carbon fiber, and CMC are mixed according to the mass ratio of 80:5:15, stirred in deionized water to form a slurry, and then sprayed on foamed aluminum to make a flexible e...

Embodiment 3

[0054] 30g of TiO with lithium intercalation activity 2 After being acidified with 0.5mol / L nitric acid for 0.3h, it was loaded into the adsorption column, and 1L of lithium-containing salt lake brine was added. The composition of the lithium-containing salt lake brine is shown in Table 3 below. + Concentration dropped to 252mg / L, Mg 2+ Concentration dropped to 18927.7mg / L, lithium intercalation active MnO 2 to Li + The adsorption capacity is 41.6mg / g, for Mg 2+ The adsorption capacity is 2.41mg / g, and then the lithium-absorbing Li 4- X Ti 5 o 12 (X=1.63), after washing and drying at 100°C, heat treatment in a muffle furnace at 600°C for 2 hours;

[0055] Table 3. Lithium-containing salt lake brine composition list

[0056]

[0057] The heat-treated Li 4- X Ti 5 o 12 (X=1.63), carbon nanotubes, and PVDF are mixed according to the mass ratio of 94.5:0.1:5.4, stirred in NMP solvent to form a slurry, and then sprayed on foamed nickel to make a flexible electrolytic...

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Abstract

The invention discloses a method for extracting lithium from lithium-containing brine. The method comprises the steps that a host material with lithium-insertion activity is used for adsorbing lithium ions in the lithium-containing brine, and according to the lithium ion battery charging principle, lithium is separated out from a cathode of an electrolytic tank under the specific voltage range so as to extract lithium from the lithium-containing brine. By means of the method, a high-purity-grade lithium product can be directly manufactured through the lithium-containing brine, and thus the international competitiveness of domestic lithium products is improved. The extracting method is suitable for purification of lithium in seawater lithium brine, underground lithium brine, salt lake lithium brine and other lithium-containing brine with different components, and the lithium extracting effect of the method is obviously superior to that of traditional technologies for high magnesium-lithium-ratio lithium-containing brine difficult to separate. In addition, the method is short in process, and the main consumable item, namely, the adsorbent of the host material with lithium-insertion activity can be used in a regeneration cycle mode, so that article losses are reduced, and cost is lower.

Description

technical field [0001] The invention relates to the technical field of metal extraction, in particular to a method for extracting lithium from lithium-containing brine. Background technique [0002] Lithium metal and lithium salt products are widely used in modern industry, especially in high-tech fields. In recent years, with the rapid development of lithium-ion batteries, the application demand for lithium resources has been increasing year by year, and the development and utilization of lithium resources has a broader development prospect. . [0003] my country's lithium resources mainly come from ore lithium resources and brine lithium resources. The cost of extracting lithium from ore is relatively high, so lithium resource developers have begun to focus on the development of brine lithium resources. my country's brine lithium resources include seawater lithium brine, underground lithium brine, salt lake lithium brine, etc. Among them, salt lake lithium brine is mainly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B26/12C25C1/02
CPCC22B26/12C25C1/02Y02P10/20
Inventor 李震祺刘立君宋翠环
Owner 李震祺
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