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Extractive organic phase and application thereof

An organic phase and extraction technology, applied in the direction of improving process efficiency, etc., can solve the problems of low selectivity and low efficiency

Active Publication Date: 2018-11-06
SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem actually solved by the present invention is to overcome the defects of low efficiency and low selectivity in the existing method for recovering lithium, and provide a kind of extraction organic phase and its application, through the extraction agent and the aqueous phase lithium ion Extraction and back extraction can realize high-efficiency and high-selectivity extraction of lithium ions, and have high economic benefits

Method used

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  • Extractive organic phase and application thereof
  • Extractive organic phase and application thereof

Examples

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Embodiment 1

[0070] Preparation of extraction organic phase, compound: The concentration is 0.11mol / L; modifier: trioctylmethylammonium chloride, the concentration is 0.11mol / L; diluent: chloroform. In the lithium-containing aqueous phase, the concentration of lithium ions is 0.05 mol / L, and the concentration of chloride ions is 0.05 mol / L.

[0071] Extraction method: Add a certain amount of NaOH to the lithium-containing aqueous phase to adjust the pH value to 12-13. The organic phase of the extractant is compared with the aqueous phase at a ratio of 1:1, and fully exposed to single-stage extraction. After static phase separation, 2mol / L hydrochloric acid was used as the stripping solution, and the organic phase system was recycled after stripping to obtain the stripped lithium product. The lithium ion concentration in the extracted organic phase was measured to be 0.042mol / L, and the single-stage extraction rate of lithium was 84%.

Embodiment 2

[0073] Preparation of extraction organic phase, compound: The concentration is 0.50mol / L; modifier: trioctyl ammonium methyl sulfate, the concentration is 0.30mol / L; diluent: 2-octanone. In the lithium-containing aqueous phase, the concentration of lithium ions is 0.20 mol / L, and the concentration of sulfate ions is 0.10 mol / L.

[0074] Extraction method: Add a certain amount of NaOH to the lithium-containing aqueous phase to adjust the pH value to 13-14, and the organic phase of the extractant is compared with the aqueous phase at a ratio of 1:1, fully exposed to single-stage extraction. After static phase separation, 2mol / L hydrochloric acid was used as the stripping solution, and the organic phase system was recycled after stripping to obtain the stripped lithium product. The lithium ion concentration in the extracted organic phase was measured to be 0.17mol / L, and the single-stage extraction rate of lithium was 85%.

Embodiment 3

[0076] Preparation of extraction organic phase, compound: The concentration is 0.60mol / L; modifier: butyl phosphonate dibutyl ester, the concentration is 0.60mol / L; diluent: sulfonated kerosene. In the lithium-containing aqueous phase, the concentration of lithium ions is 0.15 mol / L, the concentration of sulfate ions is 0.05 mol / L, and the concentration of hydroxide ions is 0.05 mol / L.

[0077] Extraction method: Add a certain amount of NaOH to the lithium-containing aqueous phase to adjust the pH value to 14. The organic phase of the extractant is compared with the aqueous phase at a ratio of 1:1, and fully exposed to single-stage extraction. After standing still for phase separation, 2mol / L sulfuric acid was used as the stripping solution, and the organic phase system was recovered and recycled after stripping to obtain the stripped lithium product. The lithium ion concentration in the organic phase of the extractant was measured to be 0.096mol / L, and the single-stage extr...

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Abstract

The invention discloses an extractive organic phase and application thereof. The extractive organic phase comprises a diluting agent, a modifying agent and a compound expressed as a formula (I); the concentration of the compound expressed as the formula (I) (as described in the description) in the extractive organic phase is 0.05-2 mol / L; and the concentration of the modifying agent in the extractive organic phase is 0.05-2 mol / L. The application can comprise the following steps: the extractive organic phase is used for extracting water phase extractives containing lithium ions; and the layering is performed to collect organic phases. The extractive organic phase and the extracting method for extracting lithium have the advantages of high extracting efficiency of the lithium ions, easy phase separation and convenient operation method, meanwhile, achieve excellent lithium-sodium and lithium-potassium separation coefficients, and can realize high-selectivity separation of lithium from other alkali metal.

Description

technical field [0001] The invention relates to an extraction organic phase and its application. Background technique [0002] Lithium is the metal element with the smallest density in nature and has the smallest atomic radius. Its simple metal and its compounds have different chemical and physical properties from many other metal elements, and it has a wide range of industrial uses. The application of lithium and its compounds involves glass, ceramics, medicine, smelting, refrigeration and other fields. Especially in the field of new energy, lithium is known as an "energy element" and is an important raw material for lithium batteries. The global demand is rapidly increasing at a rate of 8-10% per year. On the other hand, the two stable isotopes of lithium, lithium-6 and lithium-7, have important uses in the field of nuclear energy. Lithium-6 is an essential raw material in nuclear fusion reactors, and lithium-7 is a regulator in fission reactors. agent and coolant. Ther...

Claims

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Application Information

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IPC IPC(8): C22B3/40C22B26/12
CPCC22B26/12C22B3/409Y02P10/20
Inventor 张伟徐永昌张丽君胡金波
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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