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Method for efficiently extracting lithium from salt lake brine

A salt lake brine and extraction technology, applied in the direction of improving process efficiency, etc., can solve the problems of no practical industrial application significance, the price of diisobutyl ketone dissolution loss, and the inability to apply industrialization, etc., and achieve good recyclability, low price, and raw materials rich effect

Active Publication Date: 2014-04-09
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0005] 1. A method for extracting lithium chloride from lithium-containing brine (CN87103431), which proposes to use TBP-FeCl 3 -200 # An extraction system composed of solvent kerosene, the brine is extracted, pickled, back-extracted (6-9mol / L), impurity-removed, roasted, etc. to finally obtain anhydrous lithium chloride, but due to the The corrosion problem is serious and cannot be applied to industrialization
[0006] 2. The American Lithium Industry Company proposed a method of extracting lithium from brine with a high magnesium-lithium ratio using an extraction system consisting of 80% diisobutyl ketone (DIBK)-20% tributyl phosphate (TBP) (US3537813), after seven stages of extraction , the total recovery rate of lithium is more than 80%, but the dissolution loss of diisobutyl ketone in water is serious and the price is expensive, which has no practical industrial application significance
[0010] After careful analysis and comparison, the existing technology still has shortcomings such as low extraction efficiency, high acidity of stripping, serious equipment corrosion, and high production cost. The above five patents have not fundamentally solved the problems existing in the existing technology. Lithium technology still needs improvement

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  • Method for efficiently extracting lithium from salt lake brine

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Embodiment 1

[0031] A method for extracting lithium from salt lake brine extraction method, the steps are as follows:

[0032] (1) Extraction: Take 24mL of TIP (triisopropyl phosphate), 3mL of kerosene and 3mL of 1-butyl-3-methylimidazolium hexafluorophosphate in a separatory funnel and mix evenly, then add lithium-containing 15mL of 2.2g / L salt lake brine, no need to adjust the pH value of the brine, after shaking for 10min, separate the aqueous phase and the organic phase, and perform a tertiary extraction on the aqueous phase.

[0033] (2) Stripping: the organic phase is stripped with 1mol / L HCl solution, the single stripping time is 2-10min, the stripping ratio is 3, the aqueous phase is collected to be an aqueous solution containing lithium ions, and the organic phase is stripped with 1mol / LNaOH solution After washing and regeneration, it can be recycled repeatedly, which greatly reduces the production cost, avoids environmental pollution, and produces no three wastes.

[0034] (3) A...

Embodiment 2

[0036] A method for extracting lithium from salt lake brine extraction method, the steps are as follows:

[0037] (1) Extraction: First take 24mL of TIP, 3mL of kerosene and 3mL of 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt and mix them evenly in a separatory funnel, then add lithium containing 2.2g / L salt lake brine 20mL, no need to adjust the pH value of the brine, after shaking for 10 minutes, separate the aqueous phase and the organic phase, and carry out the tertiary extraction of the aqueous phase.

[0038] (2) Back extraction: the organic phase is back extracted with 1mol / L HCl solution, the back extraction ratio is 2, the water phase is collected to be an aqueous solution containing lithium ions, and the organic phase can be reused after being washed and regenerated with 1mol / L NaOH solution, greatly improving The production cost is reduced, environmental pollution is avoided, and no three wastes are generated.

[0039] (3) Analysis: ICP-OES ...

Embodiment 3

[0041] A method for extracting lithium from salt lake brine extraction method, the steps are as follows:

[0042](1) Extraction: First take TIP21mL, kerosene 4.5mL and N-methyl, propylpiperidine bis(trifluoromethanesulfonyl)imide salt 4.5mL and mix them evenly in a separatory funnel, then add lithium containing 2.2 g / L salt lake brine 20mL, no need to adjust the pH value of the brine, after shaking for 10 minutes, separate the aqueous phase and the organic phase, and carry out the three-stage extraction of the aqueous phase.

[0043] (2) Stripping: the organic phase is back-extracted with 1mol / L HCl solution, and the aqueous phase is collected to be an aqueous solution containing lithium ions. The organic phase can be reused after being washed and regenerated with 1mol / LNaOH solution, which greatly reduces production costs and avoids the Environmental pollution, no three wastes produced.

[0044] (3) Analysis: ICP-OES is used to analyze and measure the content of each ion. Af...

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Abstract

The invention relates to a method for efficiently extracting lithium from salt lake brine. The method comprises the following steps: (1) forming an extraction organic phase by an extraction agent, a co-extraction agent and a diluent, and then mixing the extraction organic phase with salt lake brine according to the volume ratio of (3-4):2 for three-stage extraction with single extraction time being 2-10 minutes to obtain an organic phase; and (2) mixing the organic phase obtained in step (1) with a reverse extraction acid solution (0-1 mol / L) for three-stage reverse extraction with single reverse extraction time being 2-10 minutes, and collecting an aqueous phase which is an aqueous solution containing lithium ions. The co-extraction agent of an extraction system of the method is hydrophobic ionic liquid, compared with conventional synergist ferric trichloride, the interference caused by iron ions is avoided, the reverse extraction acidity is greatly reduced, more importantly the lithium-magnesium separation factor is significantly improved, and the elution step of magnesium ions is reduced; in addition, the method provided by the invention is easy in process, easy to control, high in operation reliability, and good in recyclability of the organic phase, and greatly reduces the production cost for extracting the lithium from the salt lake brine.

Description

technical field [0001] The invention belongs to the field of inorganic chemical industry and relates to a process for extracting lithium, in particular to a method for efficiently extracting lithium from salt lake brine. Background technique [0002] Lithium is an important rare element that promotes the development of related industries such as modernization and science and technology. It is one of the most promising new energy and strategic resources. It is widely used in high-energy lithium batteries, rubber industry, aerospace, ceramics, laser, Many fields such as medicine, welding, explosives, cement, smelting and new energy are known as "energy metals in the 21st century". Especially in the field of new energy, the energy released by 1g of lithium through thermonuclear reaction is equivalent to the energy produced by the combustion of more than 20,000 tons of high-quality coal. Lithium-ion batteries and nuclear fusion power generation are the hot research directions no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/12C22B3/26
CPCY02P10/20
Inventor 邓天龙高道林余晓平郭亚飞王士强刘明明张会宗
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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