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Method for extracting lithium hydroxide by salt lake brine

A lithium hydroxide, salt lake brine technology, applied in chemical instruments and methods, energy wastewater treatment, water/sewage multi-stage treatment, etc., can solve problems such as unreported

Active Publication Date: 2014-06-18
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the use of bipolar membrane electrodialysis in the production of lithium hydroxide has not been reported

Method used

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  • Method for extracting lithium hydroxide by salt lake brine
  • Method for extracting lithium hydroxide by salt lake brine
  • Method for extracting lithium hydroxide by salt lake brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] a. Add 2500ml of salt lake brine into the beaker (see Table 1 for specific ingredients), and place it on the first stirring device 1, add 5ml of saturated sodium carbonate solution into the salt lake brine and stir for 4 hours to remove magnesium ions and Calcium ions to obtain low-magnesium-lithium ratio brine, and import the low-magnesium-lithium ratio brine into the low-magnesium-lithium ratio brine storage tank 2;

[0069] b. Concentrate the low-magnesium-lithium-ratio brine using an ordinary electrodialysis membrane stack to obtain lithium-ion concentrated brine;

[0070] The specific process is:

[0071] Firstly, the low-magnesium-lithium ratio brine is introduced into the desalinated liquid storage tank 3c and the concentrated liquid storage tank 4c by the low-magnesium-lithium ratio brine storage tank 2 respectively through the desalinated liquid storage tank conduit 2a and the concentrated liquid storage tank conduit 2b, respectively as the desalinated liquid (...

Embodiment 2

[0091] Adopt the same method of step a, b, c, d, e in embodiment 1 to prepare lithium carbonate solution, and utilize electrolysis-bipolar membrane electrodialysis system to carry out the electrolysis and dissociation of water to obtain hydrogen by the lithium carbonate solution obtained lithium oxide. The specific process is:

[0092] First, add 200ml of lithium hydroxide solution with a concentration of 0.1mol / L in the lye tank 10; mol / L lithium nitrate solution 200ml;

[0093] Then, control the lithium hydroxide solution between the lye tank and the first alkali chamber and between the lye tank and the second alkali chamber, carbonic acid by the alkali chamber drive pump 10a, the material chamber drive pump 9a and the anode chamber drive pump 11a respectively The lithium solution is circulated between the liquid tank and the first liquid chamber and between the liquid tank and the second liquid chamber, and the lithium nitrate solution is circulated between the electrolyte ...

Embodiment 3

[0099] Adopt the same method of step a, b, c, d, e in embodiment 1 to prepare lithium carbonate solution, and utilize electrolysis-bipolar membrane electrodialysis system to carry out the electrolysis and dissociation of water to obtain hydrogen by the lithium carbonate solution obtained lithium oxide. The specific process is:

[0100] First, add 200ml of lithium hydroxide solution with a concentration of 0.1mol / L in the lye tank 10; mol / L lithium nitrate solution 200ml;

[0101] Then, control the lithium hydroxide solution between the lye tank and the first alkali chamber and between the lye tank and the second alkali chamber, carbonic acid by the alkali chamber drive pump 10a, the material chamber drive pump 9a and the anode chamber drive pump 11a respectively The lithium solution is circulated between the liquid tank and the first liquid chamber and between the liquid tank and the second liquid chamber, and the lithium nitrate solution is circulated between the electrolyt...

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Abstract

The invention discloses a method for extracting lithium hydroxide by salt lake brine. The method is characterized by comprising the following steps: firstly, removing calcium and magnesium ions in salt lake brine by adding sodium carbonate; concentrating the obtained brine with low lithium-magnesium ratio through ordinary electrodialysis to obtained concentrated brine; adding sodium carbonate to the concentrated brine and removing the calcium and magnesium ions again; adding sodium carbonate to obtain lithium carbonate through a multi-step crystallization method; preparing the lithium hydroxide by an electrolysis-bipolar membrane electrodialysis system after dissolving the lithium carbonate again. The traditional distillation process is replaced by ordinary electrodialysis, so that energy consumption is reduced, and the method is friendly to environment. In addition, the lithium hydroxide is produced by using an electrolysis-bipolar membrane electrodialysis technology, the defects of high energy consumption and low purity in the traditional lime method and electrolytic process are avoided, the capacity of the lithium hydroxide is improved, no waste residue is generated in the process, and the method is friendly to environment. Taken together, the method is simple to operate, low in energy consumption, friendly to environment, and expanded production is easy to achieve.

Description

technical field [0001] The invention relates to a new method for extracting lithium resources from a salt lake, in particular to a method for preparing high-purity lithium hydroxide from salt lake brine. Background technique [0002] Lithium-based compounds are widely used in industry, such as for the production of glass, ceramics, air-conditioning refrigerants, and lithium batteries. Especially with the continuous development of China's industry, lithium batteries for storing electrical energy are developing rapidly, and The demand for high-purity lithium hydroxide necessary for lithium batteries is also increasing. At the same time, my country is also a country with a large amount of lithium resources, but the lithium extraction process is relatively backward, and there are mainly problems such as high energy consumption, unfriendly environment, and low purity of lithium hydroxide obtained. Therefore, a new, environmentally friendly production process that can produce hig...

Claims

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Application Information

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IPC IPC(8): C02F9/06C25B1/16
CPCY02W10/37
Inventor 徐铜文蒋晨啸汪耀明冯红艳
Owner UNIV OF SCI & TECH OF CHINA
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