Extraction composition and application thereof

A composition and extraction technology, applied in the chemical industry, can solve the problems of low selectivity and low extraction efficiency of lithium ions

Active Publication Date: 2018-12-21
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

[0004] The technical problem actually solved by the present invention is to overcome the defects of low extraction efficiency of lithium ions in the existing methods for extracting lithium from lithium-containing solutions, especially the low selectivity, and provide an extraction composition and its application

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  • Extraction composition and application thereof
  • Extraction composition and application thereof
  • Extraction composition and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Prepare the extraction organic phase system, extractant: 0.60mol / L Modifier: 0.60mol / L dioctylmethylsulfonium chloride; diluent: sulfonated kerosene. In the lithium-containing aqueous phase, the concentration of lithium ions is 0.05mol / L.

[0069] Extraction method: Add a certain amount of NaOH to the lithium-containing aqueous phase to adjust the pH value to 13-14. The organic phase system is compared with the aqueous phase at a ratio of 1:1, and fully exposed to single-stage extraction. After phase separation, 2mol / L hydrochloric acid was used as the stripping liquid, and the organic phase system was recovered and recycled after stripping to obtain the stripped lithium product, and the single-stage extraction rate of lithium was 88%.

Embodiment 2

[0071] Prepare the extraction organic phase system, extractant: 0.80mol / L Modifier: 0.60mol / L trioctylmethylammonium chloride; diluent: xylene. The lithium-containing aqueous phase is lithium hydroxide aqueous solution, and the concentration of lithium ions is 0.20 mol / L.

[0072] Extraction method: Extract the organic phase system and the water phase according to the ratio of 1:1, fully contact with single-stage extraction, and stand to separate the phases. The obtained organic phase uses 2mol / L sulfuric acid as the stripping solution, and the organic phase system is recycled after stripping to obtain the stripped lithium product, and the single-stage extraction rate of lithium is 75%.

Embodiment 3

[0074] Prepare the extraction organic phase system, extractant: 0.80mol / L Modifier: 0.80mol / L trioctyl ammonium methylsulfate; diluent: 2-octanone. The lithium ion concentration in the lithium-containing aqueous phase is 0.15mol / L, the sodium ion concentration is 0.25mol / L, and the potassium ion concentration is 0.32mol / L. The lithium-containing aqueous phase in this example is a simulated aqueous phase prepared according to the composition of industrial wastewater.

[0075] Extraction method: add a certain amount of ammonia water to the lithium-containing aqueous phase, adjust the pH value to 12-13, extract the organic phase system and the aqueous phase according to the ratio of 1:1, fully contact with single-stage extraction, and stand still for phase separation. For the obtained organic phase, 2mol / L hydrochloric acid was used as the back-extraction solution. After the back-extraction, the organic phase system was recovered and recycled, and the back-extracted lithium pro...

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Abstract

The invention discloses an extraction composition and an application thereof. The composition comprises a compound and a modifier as shown in the formula (I), and the molar ratio of the compound to the modifier is 1:0.2-1:6. When the composition contains a diluent, the application preferably comprises the following steps that the composition and a water phase whose pH value is larger than 10 and which contain lithium ions are subjected to extraction to obtain an organic phase loaded with the lithium ions. The synthesis method of the compound shown in the formula (i) is simple and convenient, and low in costs, and has the characteristics of excellent oil solubility and low water solubility. The lithium-extracted composition and the diluent have the advantages of being good in oil solubility, low in water solubility, easy in phase separation, and large in loading quantity of the lithium ions in the organic phase, possessing excellent lithium-sodium and lithium-potassium separation effect, and being capable of extracting and separating with high selectivity the lithium ions from a complex alkali metal mixed solution. (Please see the formula (I) in the specification).

Description

technical field [0001] The invention belongs to the field of chemical industry. Specifically, the present invention relates to an extraction composition and its application. Background technique [0002] Lithium has the smallest atomic radius and is currently the lightest metal known. It has chemical and physical properties different from many other metal elements, so it has a wide range of 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". As an important raw material for lithium batteries, the global demand for lithium is rapidly increasing at a rate of 8-10% per year. Therefore, the comprehensive development and utilization of lithium resources, especially the production and recovery of lithium by extraction methods, has very important social and economic benefits. [0003] At present, lithium resources at home an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/26C22B3/36C22B26/12
CPCC22B26/12C22B3/26C22B3/362Y02P10/20
Inventor 张伟顾洪熙徐永昌胡金波
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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