Method for lithium salts from high-magnesium lithium-containing brine

A technology for extracting lithium and brine, applied in the direction of lithium sulfate/sulfite, lithium halide, lithium nitrate, etc., can solve the problems of unstable process products, complex control process, unstable regeneration and extraction performance, etc., and achieve simple control process. Effective, stable process and stable product purity

Inactive Publication Date: 2016-06-08
上海颐润科技有限公司 +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for extracting lithium salt from high-magnesium lithium-containing brine to solve the technical problems of complex control process, unstable regeneration and extraction performance, and unstable process products in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of tributyl phosphate extraction system: the mixed solution of tributyl phosphate and diluent is mixed with the hydrochloric acid solution of ferric chloride, and the organic phase and the water phase are obtained at rest, and the separation of the organic phase is the tributyl phosphate extraction system; The resulting tributyl phosphate extraction system was subjected to a first extraction step. In the mixed solution of tributyl phosphate and diluent, the volume concentration of tributyl phosphate is 50%, and the diluent is sulfonated kerosene; in the hydrochloric acid solution of ferric chloride, the concentration of ferric chloride is 2mol / L, phosphoric acid The volume ratio of the mixed solution of tributyl ester and diluent to the hydrochloric acid solution of ferric chloride is 4, and the mixing time is 10 minutes.

[0028] Extraction step: use a separatory funnel to add high-magnesium lithium-containing brine (Mg / Li=15 molar ratio, the concentration ...

Embodiment 2

[0034] The preparation of tributyl phosphate extraction system: the mixed solution of tributyl phosphate and diluent is mixed with the hydrochloric acid solution of ferric chloride, the organic phase and the water phase are obtained at rest, and the separation of the organic phase is the tributyl phosphate extraction system; the obtained phosphoric acid The tributyl ester extraction system was subjected to the first extraction step. In the mixed solution of tributyl phosphate and diluent, the volume concentration of tributyl phosphate is 80%, and the diluent is sulfonated kerosene; in the hydrochloric acid solution of ferric chloride, the concentration of ferric chloride is 2.2mol / L, The volume ratio of the mixed solution of tributyl phosphate and diluent to the hydrochloric acid solution of ferric chloride is 4, and the mixing time is 3 minutes.

[0035] Extraction step: use a separatory funnel to add high-magnesium lithium-containing brine (Mg / Li=15 molar ratio, the concentr...

Embodiment 3

[0041] Preparation of the extraction system: Mix the mixed solution of tributyl phosphate and diluent with the hydrochloric acid solution of ferric chloride, stand still to obtain the organic phase and the water phase, and separate the organic phase to form the tributyl phosphate extraction system; the obtained tributyl phosphate extraction The system undergoes the first extraction step. In the mixed solution of tributyl phosphate and diluent, the volume concentration of tributyl phosphate is 50%, and the diluent is sulfonated kerosene; in the hydrochloric acid solution of ferric chloride, the concentration of ferric chloride is 2mol / L, phosphoric acid The mixing ratio of tributyl ester and diluent mixed solution to the hydrochloric acid solution of ferric chloride is 4, and the mixing time is 10min.

[0042] Extraction step: adopt the mixing and settling tank process, add a high-magnesium lithium-containing brine (Mg / Li=12 molar ratio, the concentration of hydrogen ions is 0....

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Abstract

The invention discloses a method for lithium salts from high-magnesium lithium-containing brine. The method comprises the following steps: extraction: mixing a tributyl phosphate extraction system with high-magnesium lithium-containing brine and an alkaline solution, and carrying out lithium extraction to obtain a lithium-carried extraction system and an extracted water phase; exchange: mixing a lithium salt water solution with the lithium-carried extraction system to remove impurities in the lithium-carried extraction system, thereby obtaining a high-purity-lithium-carried extraction system and an exchanged water phase: and back extraction: carrying out back extraction on the high-purity-lithium-carried extraction system with an acid solution to obtain a lithium-salt-containing water phase, and drying the water phase by distillation to obtain the lithium salts. The alkaline solution can be mixed with the extraction phase in the back extraction step and the extracted water phase in the extraction step, and the obtained regenerated extraction system can be recycled. The alkali solution is added in the extraction technique, thereby solving the problem of uncontrollable extraction process and unstable regeneration of the extraction system in the prior art.

Description

technical field [0001] The invention belongs to the technical field of chemical separation, and in particular relates to a method for extracting lithium salt from high-magnesium lithium-containing brine. Background technique [0002] The pollution of the environment and the reduction of oil reserves, and the energy crisis have increasingly threatened the stable and sustainable development of society. Lithium, as a high-energy-density electric energy carrier, has become a strategic metal for reducing environmental pollution and changing the energy structure. Energy Metals in the Eleventh Century", industrial monosodium glutamate, has a significant strategic position. At present, the application of high-purity lithium salt in high-tech fields such as new electronic materials and new energy continues to expand. It is widely used in lithium batteries, medicine and other industries. The rise of lithium-powered vehicles makes the demand for pure lithium salt more urgent. Salt lak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/04C01D15/06C01D15/10
CPCC01D15/04C01D15/06C01D15/10C01P2006/80
Inventor 何涛宋健峰张冉邢利欣王周为殷勇赵宝龙李雪梅田苗苗刘仁啸陈颖肖婷婷窦鹏佳金桐辉黄涛
Owner 上海颐润科技有限公司
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