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A kind of extraction composition, extraction system, extraction method and stripping method

A composition and extraction technology, applied in the direction of improving process efficiency, can solve problems such as low single-stage extraction rate, equipment corrosion, and large solvent loss of extractant

Active Publication Date: 2020-08-07
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 problem to be solved by the present invention is that, in order to overcome the shortcomings of the existing extractant for extracting lithium from lithium-containing brine, such as severe corrosion of equipment, large extraction agent dissolution loss, low single-stage extraction rate and low yield, and long product purification process, and Provide an extraction composition, extraction system, extraction method and stripping method

Method used

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  • A kind of extraction composition, extraction system, extraction method and stripping method
  • A kind of extraction composition, extraction system, extraction method and stripping method
  • A kind of extraction composition, extraction system, extraction method and stripping method

Examples

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Effect test

Embodiment 1

[0070] The composition of lithium-containing brine is:

[0071]

[0072]

[0073] Organic phase: Using kerosene as a diluent, the contents of the compounds N,N-bis(2-ethylhexyl)acetamide, N,N-dihexylacetamide and TBP in the kerosene solution are 25%, 5%, and 30, respectively. % (The percentage of each component in the total volume of the organic phase);

[0074] Take 1 part of lithium-containing brine and add FeC1 3 As a co-extractant, make Fe in the water phase 3+ / Li + The molar ratio is 1.3, which is fully dissolved. Add 2 parts of the above-mentioned organic phase (extraction comparison, organic phase / aqueous phase, ie O / A=2:1), and mix the two phases thoroughly at 25° C. for extraction. After mixing, leave it to stand for layering, the phase separation effect is good, the water phase is colorless, and the two-phase interface is clear. Measure Li in equilibrium water phase and organic phase respectively + , Na + , K + , Mg 2+ Concentration, the extraction rate of Li is 83.75%...

Embodiment 2

[0076] The composition of lithium-containing brine is:

[0077]

[0078] Organic phase: using kerosene as a diluent, the contents of the compounds N,N-bis(2-ethylhexyl)acetamide, N,N-dihexylacetamide, and TBP in the kerosene solution are 25%, 25%, 30, respectively % (The percentage of each component in the total volume of the organic phase);

[0079] Add 1 part of lithium-containing brine into a separatory funnel, add FeC1 3 As a co-extractant, the Fe in the water phase 3+ / Li + The molar ratio is 1.1, 1 part of the above-mentioned organic phase (compared to O / A=1 / 1) is added, and the two phases are thoroughly mixed at 25°C for extraction. After mixing, leave it to stand for layering, the phase separation effect is good, the water phase is colorless, and the two-phase interface is clear. Measure Li in equilibrium water phase and organic phase respectively + , Na + , K + And Mg 2+ , It is calculated that the extraction rate of Li is 86.44%. + , Na + , K + And Mg 2+ The distribution...

Embodiment 3

[0081] The composition of lithium-containing brine is:

[0082]

[0083] Organic phase: Using kerosene as a diluent, the contents of the compounds N,N-bis(2-ethylhexyl)acetamide, N,N-dihexylacetamide, and TBP in the kerosene solution are 5%, 5%, 80, respectively % (The percentage of each component in the total volume of the organic phase);

[0084] Add 1 part of lithium-containing brine into a separatory funnel, add FeC1 3 As a co-extractant, the Fe in the water phase 3+ / Li + The molar ratio is 1.75, and 5 parts of the above organic phase are added as an extraction composition (compared to O / A=5 / 1), and the two phases are thoroughly mixed at 40°C for extraction. After mixing, leave it to stand for layering, the phase separation effect is good, the water phase is colorless, and the two-phase interface is clear. Measure Li in equilibrium water phase and organic phase respectively + , Na + , K + And Mg 2+ , It is calculated that the extraction rate of Li is 91.25%. + , Na + , K + An...

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Abstract

The invention discloses an extraction composition, an extraction system, an extraction method and a stripping method. The extraction composition of the present invention comprises: an extractant and a neutral phosphorus-oxygen compound; the extractant includes N,N-di(2-ethylhexyl)acetamide and N,N-dihexylacetamide. The extraction composition of the invention has good acid-base stability, low solubility in water phase, low density and viscosity, no complicated extraction operation, low corrosion to equipment, and is suitable for industrial operation requirements.

Description

Technical field [0001] The invention relates to an extraction composition, an extraction system, an extraction method and a back extraction method. Background technique [0002] Lithium not only has important applications in the national defense industry, but its importance in the national economy is also increasingly evident, especially in the energy field: 6 Li and 7 Li is the fuel for future nuclear fusion reactors and an important material for nuclear fission reactions, respectively; its demand as a battery material is also increasing. Therefore, lithium is called "the energy metal of the 21st century". The demand for lithium at home and abroad continues to grow, so the research, development and utilization of lithium resources appear urgent. [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, because brine contains a variety of metal ions, its compre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/28C22B26/12
CPCC22B26/12C22B3/28Y02P10/20
Inventor 袁承业李晋锋
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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