Method for extracting lithium from salt lake brine with high magnesium-lithium ratio

A technology of salt lake brine and high magnesium-lithium ratio, which is applied in chemical instruments and methods, lithium carbonate; Inapplicable and other problems, to achieve the effect of solving the problem of magnesium damage, less entrainment loss, and simple operation

Pending Publication Date: 2020-08-04
QUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of a large amount of magnesium makes it more difficult to extract lithium. The lithium extraction methods that have been industrialized abroad are obviously not suitable for the lithium industry in Qinghai Salt Lake.
[0005] At present, the utilization of magnesium resources is mainly concentrated in primary magnesium compounds (magnesium hydroxide, magnesium oxide, magnesium carbonate, etc.), magnesium building materials, magnesium refractory materials, magnesium and magnesium alloys, etc., and the added value is not high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 8.98g AlCl 3 ·6H 2 O dissolved in 100ml of brine (determined Mg 2+ Concentration is 0.76mol / L, Li + Concentration is 0.036mol / L), weigh 9.05g NaOH, 1.98g NaOH 2 CO 3 , dissolved in 50ml of pure water to prepare a precipitant. The brine and precipitating agent added with aluminum salt were quickly mixed under high-speed shear stirring within 1~15min, adjusted to pH=10, crystallized at 65°C for 12h, filtered and washed to obtain Mg 2 Al-LDHs. Mg in the obtained filtrate was determined 2+ The residual rate is 0.00001%, Li + The retention rate was 94.14%. The above filtrate was evaporated and concentrated to 1 / 20, and then carbon dioxide was introduced to obtain 0.125 g of lithium carbonate precipitate.

Embodiment 2

[0031] Weigh 6.12g AlCl 3 ·6H 2 O dissolved in 100ml of brine (determined Mg 2+ Concentration is 0.76mol / L, Li + Concentration is 0.036mol / L), weigh 8.10g NaOH and dissolve in 40ml of pure water to make precipitant. The brine and precipitating agent added with aluminum salt were quickly mixed under high-speed shear stirring within 1~15min, adjusted to pH=11, crystallized at 100°C for 6h, filtered and washed to obtain Mg 3 Al-LDHs. Mg in the obtained filtrate was determined 2+ The residual rate is 0.00096%, Li + The retention rate is 96.67%. The above filtrate was evaporated and concentrated to 1 / 20, and then carbon dioxide was introduced to obtain 0.13 g of lithium carbonate precipitate.

Embodiment 3

[0033] Weigh 5.99g Al(NO 3 )·9H 2 O dissolved in 100ml of brine (determined Mg 2+ Concentration is 0.76mol / L, Li + Concentration is 0.036mol / L), weigh 7.6g NaOH, 0.34g NaOH 2 CO 3 , dissolved in 50ml of pure water to prepare a precipitant. The brine and precipitating agent added with aluminum salt are quickly mixed under high-speed shear stirring within 1-15 minutes, adjusted to pH=10, crystallized at 25°C for 4 hours, filtered and washed to obtain Mg 4 Al-LDHs. Mg in the obtained filtrate was determined 2+ The residual rate is 0.00144%, Li + The retention rate was 94.15%. Add 1g of lithium-ion imprinted polymer to the above filtrate, fully stir and adsorb and filter, Li in the filtrate + Almost undetectable. Then, the imprinted polymer after absorbing lithium ions was separated into lithium chloride by bipolar membrane electrodialysis, and sodium carbonate was added to obtain 0.12 g of lithium carbonate precipitate.

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Abstract

The invention belongs to the technical field of salt lake brine resource utilization. The invention provides a method for extracting lithium from salt lake brine with a high magnesium-lithium ratio. The method mainly comprises the steps: by taking magnesium in brine as a raw material, adding an aluminum source and a precipitant, precipitating magnesium and aluminum into layered double hydroxides (MgAl-LDHs), filtering and separating, reserving lithium ions in filtrate, concentrating or performing ion selective adsorption to enrich lithium, precipitating lithium with carbonate ions, and thus obtaining lithium carbonate. The chemical general formula of the obtained layered double hydroxides (MgAl-LDHs) is Mg[1-x]Al[x](OH)[2](A<n->[x/n]).yH[2]O, and the ratio of Mg<2+> to Al<3+>of LDHs can beadjusted within a certain range according to application requirements, so that the chemical composition of LDHs is changed, and the chemical properties and the charge density of laminates are furthermodulated to adapt to new applications. The method has the advantages that the obtained LDHs are magnesium-based functional materials while lithium extraction of the salt lake brine with the high magnesium-lithium ratio is achieved, the method is widely applied to the aspects of flame retardance, wastewater treatment, soil remediation and the like, and comprehensive utilization of brine resourcescan be achieved. The method is short in technological process, easy to operate and good in magnesium-lithium separation effect, magnesium resources can be fully utilized while lithium is extracted, and the magnesium damage problem of the salt lake can be well solved.

Description

technical field [0001] The invention belongs to the technical field of utilization of salt lake brine resources, and in particular provides a method for extracting lithium from salt lake brine with a high magnesium-to-lithium ratio. Background technique [0002] Salt lake brine is rich in potassium, lithium, magnesium and other resources. The utilization of potassium resources in my country has reached a considerable scale, but resources such as lithium and magnesium in the old brine after potassium extraction have not been fully utilized. How to realize efficient separation of lithium, magnesium and other resources in salt lake brine and comprehensive utilization of resources has always been one of the goals of salt lake workers. [0003] Lithium has an important strategic position in the development of energy storage materials and clean nuclear energy. It is widely used in high-energy batteries, aerospace, nuclear power generation and other fields. Lithium is the main neg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/00C01D15/08C01D15/02
CPCC01F7/00C01D15/08C01D15/02C01F7/785
Inventor 吕亮李建光王玉林曾惠明吴越超禄婷李林琪谢作法
Owner QUZHOU UNIV
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