Extraction composition, extraction system and application thereof

A composition and extraction technology, applied in the directions of lithium compounds, solvent extraction, alkali metal compounds, etc., can solve the problems of complicated operation, strong equipment corrosion, insufficient extraction rate and back-extraction performance, etc., and achieve cost saving and back-extraction performance. improved effect

Active Publication Date: 2017-12-08
SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the existing extraction systems and processes for extracting lithium salts from lithium-containing brines, such as lengthy process...

Method used

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  • Extraction composition, extraction system and application thereof
  • Extraction composition, extraction system and application thereof
  • Extraction composition, extraction system and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～ Embodiment 5

[0065] Organic phase: extractant + neutral phosphorus oxide compound + diluent

[0066] Aqueous phase: Lithium-containing brine

[0067] Phase (O:A) represents the volume ratio of organic phase to aqueous phase.

[0068] The specific operation is as follows:

[0069] A certain amount of FeCl 3 (Co-extraction agent) is added in lithium-containing brine, after shaking to dissolve it, add the organic phase, shake to extract, after the shaking is finished, leave to stand for stratification (obtain the organic phase and aqueous phase containing lithium ions after equilibrium). Determination of Li in the equilibrium aqueous phase and organic phase, respectively + 、Na + 、K + and Mg 2+ Concentration, from which to calculate the extraction rate of Li, Li + , Mg 2+ 、Na + and K + The distribution ratio of Li / Mg, Li / Na, and Li / K separation coefficients.

[0070] The experimental operation of Comparative Examples 1-3 is the same as that of Example 1.

Embodiment 6

[0072] Organic phase: extractant + neutral phosphorus oxide + diluent;

[0073] Water phase: Lithium-containing brine;

[0074] Compared (O: A): refers to the volume ratio of organic phase and aqueous phase;

[0075] The specific operation is as follows:

[0076] A certain amount of FeCl 3 (Co-extraction agent) is added to the organic phase, then the water phase is added, the balance is oscillated, and the layers are left to stand to obtain a balanced water phase and an organic phase containing lithium ions. Determination of Li in the equilibrium aqueous phase and organic phase, respectively + 、Na + 、K + and Mg 2+ Concentration, from which to calculate the extraction rate of Li, Li + , Mg 2+ 、Na + and K + The distribution ratio of Li / Mg, Li / Na, and Li / K separation coefficients.

[0077] The lithium-containing brine parameters of Examples 1-6 and Comparative Examples 1-3 are shown in Table 1:

[0078] Table 1. The content of each ion in lithium-containing brin...

Embodiment 7

[0088] Embodiment 7 Stripping

[0089] An effective extraction system requires not only excellent extraction performance, but also good stripping performance.

[0090]

[0091] A certain amount of FeCl 3 (Co-extraction agent) was added in 60 parts (volume) of lithium-containing brine (FeCl 3 See the examples 2, 4, and 5 for each component and content in the lithium-containing brine. After shaking to dissolve it, add 30 parts (volume) of the organic phase in examples 2, 4, and 5, and shake for 10 minutes , and extract to obtain an organic phase loaded with lithium ions. Mix 30 parts (volume) of the organic phase loaded with lithium ions with 1 part (volume) of a 6mol / L aqueous hydrochloric acid solution, shake at 24°C for 10 minutes, carry out back extraction, stand and separate the layers, and measure the Li in the two phases in the equilibrium two phases of the back extraction. + concentration. The specific parameters are shown in Table 4 below.

[0092] Table 4. St...

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Abstract

The invention discloses an extraction composition, an extraction system and application thereof. The extraction composition disclosed by the invention comprises an extraction agent and a neutral phosphorus oxide compound of formula A as shown in the description, wherein the extraction agent comprises N,N-di(2-ethylhexyl) acetamide and N,N-dihexyl butyramide. As a mixture of amide compounds and the neutral phosphorus oxide compound of specific structures is adopted as the extraction agent, the extraction rate for Li of lithium-containing brine is 86% or greater, and can be up to 93.58% at most; the lithium-magnesium allocation coefficient is as high as 500 or greater, and can be up to 773 at most; when lithium is reextracted with HCl, the reextraction rate is 86% or greater, the extraction and reextraction properties for extracting lithium from the lithium-containing brine are greatly improved, the cost is reduced, and industrial production can be relatively well met.

Description

technical field [0001] The invention relates to an extraction composition, an extraction system and applications thereof. Background technique [0002] Lithium not only has important applications in the defense industry, but its importance in the national economy is also becoming increasingly evident, especially in the energy field: 6 Li and 7 Li is an important material for the fuel of future nuclear fusion reactors and for nuclear fission reactions, respectively: it is also in increasing demand as a battery material. Therefore, lithium is known as "the energy metal of the 21st century". The demand for lithium continues to grow at home and abroad, so the research, development and utilization of lithium resources are imminent. [0003] Salt lake brine is an important resource of lithium. my country is rich in salt lake brine lithium resources, and its reserves rank among the top in the world. However, since brine contains a variety of metal ions, its comprehensive utili...

Claims

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Application Information

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IPC IPC(8): B01D11/04C02F1/26C01D15/00
CPCB01D11/04B01D11/0492C01D15/00C02F1/26
Inventor 袁承业李晋锋
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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