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Method and device for extracting lithium from salt lake brine with high magnesium-lithium ratio

A technology of salt lake brine and high ratio of magnesium to lithium, applied in lithium halide and other directions, can solve the problems of consumption of fresh water, low quality of lithium carbonate products, and large dissolution loss of adsorbents, and achieve the effect of saving energy consumption

Pending Publication Date: 2017-11-28
JIANGSU JIUWU HITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the calcination and leaching method can solve the problem of separation of magnesium and lithium in salt lake brine with high magnesium-lithium ratio, it consumes a lot of energy and the economic benefits are not ideal.
The adsorption method can be applied to salt lake brine with low magnesium-lithium ratio and high magnesium-lithium ratio respectively, but the adsorption method has problems such as large solvent loss of the adsorbent, large amount of fresh water consumption, and low quality of lithium carbonate produced.
The nanofiltration method can directly extract lithium from salt lake brine, but because the total ion concentration in the brine is too high, the pressure required for the old brine to enter the nanofiltration directly is too large, which exceeds the carrying range of the nanofiltration membrane, so before entering the membrane system Need to use a lot of fresh water to dilute the old brine, consume a lot of fresh water

Method used

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  • Method and device for extracting lithium from salt lake brine with high magnesium-lithium ratio
  • Method and device for extracting lithium from salt lake brine with high magnesium-lithium ratio

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Experimental program
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Effect test

Embodiment 1

[0066] (1) After the brine is concentrated by natural evaporation, the Mg 2+ The concentration is 123.4g / L, Li + The concentration is 2.40g / L, Na + The concentration is 2.20g / L, B + The concentration is 1.60g / L, SO 4 2- The concentration is 32.6g / L, and the COD is 187.7mg / L. After adding sulfuric acid to acidify, boron is extracted to obtain boron-removing brine. B in the brine + The concentration is 50mg / L;

[0067] (2) Mix the boron-removing brine with the concentrated water produced by the nanofiltration process in the later stage, and then enter the fresh water side of the electrodialysis equipment with ion selection function, and mix the pure water with the clear liquid produced by the reverse osmosis and high-pressure reverse osmosis process As the starting solution of concentrated water, under the action of electric field force, monovalent ions pass through the ion selective membrane from the fresh water side to the concentrated water side, while most of the divale...

Embodiment 2

[0073] (1) After the brine is concentrated by natural evaporation, the Mg 2+ The concentration is 112.5g / L, Li + The concentration is 3.0g / L, Na + The concentration is 2.8g / L, B + The concentration is 2.0g / L, SO 4 2- The concentration is 28.4g / L, and the COD is 189.9mg / L. After adding sulfuric acid to acidify, boron is extracted to obtain boron-removing brine. B in the brine + The concentration is 48mg / L;

[0074] (2) Mix the boron-removing brine with the concentrated water produced by the nanofiltration process in the later stage, and then enter the fresh water side of the electrodialysis equipment with ion selection function, and mix the pure water with the clear liquid produced by the reverse osmosis and high-pressure reverse osmosis process As the starting solution of concentrated water, under the action of electric field force, monovalent ions pass through the ion selective membrane from the fresh water side to the concentrated water side, while most of the divalent ...

Embodiment 3

[0080] (1) After the brine is concentrated by natural evaporation, the Mg 2+ The concentration is 132.1g / L, Li+ The concentration is 2.3g / L, Na + The concentration is 2.2g / L, B + The concentration is 2.3g / L, SO 4 2- The concentration is 33.1g / L, and the COD is 190.9mg / L. Add sulfuric acid and acidify to extract boron to obtain boron-removing brine. B in the brine + The concentration is 48mg / L;

[0081] (2) Mix the boron-removing brine with the concentrated water produced by the nanofiltration process in the later stage, and then enter the fresh water side of the electrodialysis equipment with ion selection function, and mix the pure water with the clear liquid produced by the reverse osmosis and high-pressure reverse osmosis process As the starting solution of concentrated water, under the action of electric field force, monovalent ions pass through the ion selective membrane from the fresh water side to the concentrated water side, while most of the divalent ions are trap...

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Abstract

The invention provides a method and a device for extracting lithium from salt lake brine with a high magnesium-lithium ratio. The method comprises the following process steps: (1) removing boron from naturally evaporated and concentrated brine; (2) performing selective electrodialysis treatment on the boron-removed brine so as to obtain brine with a low magnesium-lithium ratio; (3) filtering the brine with low magnesium-lithium ratio by using a nanofiltration membrane so as to obtain brine with a low lithium-magnesium ratio; (4) performing deep decontamination on the brine with the low lithium-magnesium ratio by using an ion exchange resin so as to obtain lithium brine; (5) concentrating the lithium brine by using a reverse osmosis membrane so as to obtain a primary concentrated lithium liquid; and (6) filtering the primary concentrated lithium liquid by using a high-pressure osmosis membrane, thereby obtaining a final concentrated lithium liquid. The method is good in operability, the overall energy consumption is reduced, and the lithium extraction efficiency is improved.

Description

technical field [0001] The invention belongs to the field of inorganic salt chemical industry. Specifically, the invention relates to a method and a device for extracting lithium from salt lake brine with a high magnesium-lithium ratio. Background technique [0002] As the lightest metal in nature, lithium is a very important energy metal. Lithium and its compounds are widely used in glass, ceramics, batteries and nuclear industries because of their many important properties. In recent years, with the rapid development of information technology, lithium-ion lithium batteries have become one of the fastest growing fields. Moreover, due to the concern of countries all over the world on the shortage of mineral energy, detailed clean energy, especially the development strategy of electric vehicles has been proposed at home and abroad. Therefore, lithium has become an energy material in the 21st century and is known as an important element that drives the world forward. [00...

Claims

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Application Information

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IPC IPC(8): C01D15/04
CPCC01D15/04
Inventor 曹恒霞王肖虎杨积衡熊福军杨文银项娟彭文博范克银
Owner JIANGSU JIUWU HITECH
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