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Ionic liquid extraction phase and extraction method for extracting lithium from lithium-containing brine

An ionic liquid and a technology for extracting lithium, which is applied in the fields of chemical industry and extraction chemistry, can solve the problems of large dissolution loss of hydrophilic ionic liquids, increase economic costs, and low extraction efficiency, and achieve high-efficiency extraction, simple operation, and optimized extraction process Effect

Inactive Publication Date: 2021-03-19
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, a variety of ionic liquids have been developed for extracting lithium from salt lake brine, but there are common problems: the extraction efficiency of hydrophobic ionic liquids is low, but the dissolution loss of hydrophilic ionic liquids is large, which not only increases economic costs , and pollute the environment

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  • Ionic liquid extraction phase and extraction method for extracting lithium from lithium-containing brine
  • Ionic liquid extraction phase and extraction method for extracting lithium from lithium-containing brine
  • Ionic liquid extraction phase and extraction method for extracting lithium from lithium-containing brine

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Embodiment 1

[0034] In this embodiment, the composition of the extraction phase is as follows: the ionic liquid is used as the extractant, and dichloromethane is used as the diluent. In lithium-containing brine, the lithium content is 0.5g / L, the magnesium content is 4.0g / L, the sodium content is 6.0g / L, and the potassium content is 2.5g / L.

[0035] Using ionic liquid extraction phase and lithium-containing brine as raw materials, lithium is extracted through the following steps:

[0036] (1) Mix the extraction phase with the lithium-containing brine at a ratio of 2:1, the content of the extractant is 30%, and stir at 25°C for 10 minutes to perform the extraction operation.

[0037] (2) After the extraction is completed, add hydrochloric acid to adjust the water phase H + The concentration is 0.2mol / L, and the phase separation is allowed to stand, and the single-stage extraction rate of lithium is 70.6%. The extraction rates of Mg, Na and K were 0.7%, 0.9% and 0.3%, respectively.

[003...

Embodiment 2

[0040] In this embodiment, the composition of the extraction phase is as follows: the ionic liquid is used as the extractant, and dichloromethane is used as the diluent. In lithium-containing brine, the lithium content is 1.0g / L, the magnesium content is 8.0g / L, the sodium content is 12.0g / L, and the potassium content is 5.0g / L.

[0041] Using ionic liquid extraction phase and lithium-containing brine as raw materials, lithium is extracted through the following steps:

[0042] (1) Mix the extraction phase with the lithium-containing brine at a ratio of 3:1, the content of the extractant is 40%, stir at 30°C for 20min, and perform the extraction operation.

[0043] (2) After the extraction, add hydrochloric acid to adjust the water phase H + The concentration is 0.6mol / L, and the phase separation is allowed to stand, and the single-stage extraction rate of lithium is 72.1%. The extraction rates of Mg, Na and K were 0.8%, 1.0% and 0.4%, respectively.

[0044] (3) The loaded o...

Embodiment 3

[0046] In this embodiment, the composition of the extraction phase is as follows: the ionic liquid is used as the extractant, and dichloromethane is used as the diluent. In lithium-containing brine, the lithium content is 0.5g / L, the magnesium content is 4.0g / L, the sodium content is 6.0g / L, and the potassium content is 2.5g / L.

[0047] Using ionic liquid extraction phase and lithium-containing brine as raw materials, lithium is extracted through the following steps:

[0048] (1) Mix the extraction phase with the lithium-containing brine at a ratio of 3:1, the content of the extractant is 30%, and stir at 25°C for 10 minutes to perform the extraction operation.

[0049] (2) After the extraction is completed, add hydrochloric acid to adjust the water phase H + The concentration is 0.2mol / L, and the phase separation is allowed to stand still, and the single-stage extraction rate of lithium is 80.6%. The extraction rates of Mg, Na and K were 1.8%, 1.7% and 0.8%, respectively.

...

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Abstract

The invention discloses an ionic liquid extraction phase and extraction method for extracting lithium from lithium-containing brine, and belongs to the technical field of extraction chemistry and chemical engineering. The extraction phase comprises 10%-40% of an extraction agent and the balance a diluent, wherein the extraction agent is phosphate ionic liquid, the percentage is the percentage accounting for the total volume of the extraction phase, and the ionic liquid can be transferred from a water phase to an organic phase under the regulation and control of acid. The extraction method is characterized in that the ionic liquid extraction phase can be mutually dissolved with the lithium-containing brine in an extraction section, so that the ionic liquid and lithium ions are fully complexed; and a low-concentration acid solution is added in a phase separation section to enable the lithium-loaded ionic liquid to be subjected to phase transfer so as to realize separation of the extraction phase and the brine, and then backwashing is conducted by using high-concentration acid to finally obtain lithium salt. According to the extraction phase and the extraction method, a synergistic extraction agent is not needed, and no third phase is generated in an extraction process.

Description

technical field [0001] The invention belongs to the technical fields of extraction chemistry and chemical industry, and in particular relates to an ionic liquid extraction phase and an extraction method for extracting lithium from lithium-containing brine. Background technique [0002] Lithium and its compounds are widely used in electronics, manufacturing, aerospace and other fields. In recent years, with the increasing demand for lithium in lithium-powered batteries, the demand for lithium in the international market has grown rapidly, and the price of lithium products has doubled. As the main type of lithium resources, salt lake brine lithium resources account for 91% of the world's total lithium resources. Because the extraction of lithium from salt lake brine has the advantages of simpler process, lower cost, and strong market competitiveness than traditional solid lithium ore, it has become the main way to develop and produce lithium salts in the lithium industry at h...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B3/38
CPCC22B26/12Y02P10/20
Inventor 康锦卫丽娜阴彩霞李恩泽李虎程芳琴
Owner SHANXI UNIV
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