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Method of integrating selective electrodialysis and selective bipolar membrane electrodialysis to treat salt lake brine to prepare lithium hydroxide

A technology of bipolar membrane electrodialysis and salt lake brine, applied in the direction of chemical instruments and methods, lithium oxide;/hydroxide, chloride preparation, etc., to achieve low cost, reduce production cost, and reduce calcium and magnesium ion content Effect

Active Publication Date: 2019-07-30
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has not been reported for the production of lithium hydroxide

Method used

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  • Method of integrating selective electrodialysis and selective bipolar membrane electrodialysis to treat salt lake brine to prepare lithium hydroxide
  • Method of integrating selective electrodialysis and selective bipolar membrane electrodialysis to treat salt lake brine to prepare lithium hydroxide
  • Method of integrating selective electrodialysis and selective bipolar membrane electrodialysis to treat salt lake brine to prepare lithium hydroxide

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Experimental program
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Embodiment 1

[0034] (1) The magnesium ion concentration in the Chaerhan Salt Lake brine used in the present invention is 72500mg / L, the calcium ion concentration is 8910mg / L, and the lithium ion concentration is 159mg / L. The monovalent selective electrodialysis device is attached as figure 2 As shown, the membrane stack is composed of 5 unit electrodialysis cells connected in series, and the assembly sequence of each unit electrodialysis cell from the anode to the cathode is monovalent selective cation exchange membrane, monovalent selective anion exchange membrane, monovalent selective cation exchange membrane, and monovalent selective cation exchange membrane. Membrane to form a concentrating chamber and a desalination chamber, and two adjacent membranes are separated by a separator; the cathode of the monovalent selective electrodialysis device is connected to the negative pole of the DC power supply, and the anode is connected to the positive pole of the DC power supply connected. Th...

Embodiment 2

[0042] With reference to Example 1, step 1) get the film stack that CIMS / ACS / CIMS forms, adjust current density 8,10,12mA / cm 2 Experiment below. It was found that when the current density was 12mA / cm 2 Precipitation occurs in the compartment close to the anode liquid side, which is analyzed to be that the hydroxide ions generated by the electrode solution under high current density leak into the desalination chamber and combine with magnesium ions to produce precipitation. Therefore, it is more reasonable to conduct experiments at low current density.

Embodiment 3

[0044] With reference to embodiment 1, step 1) take the membrane stack that CIMS / ACS / CIMS forms to carry out experiment, adjust current density to be 4mA / cm 2 , reacted for 90 minutes, and the lithium ion yield in the concentration chamber was 65.28%.

[0045] Other steps are with embodiment 1, the alkali chamber of final monovalent selective bipolar membrane electrodialysis device obtains lithium hydroxide, detection concentration is 0.161mol / L, and purity is more than 99%, and acid chamber obtains the hydrogen chloride solution of 0.158mol / L, The current efficiency is 53.77%, and the energy consumption is 5.72kWh / kg.

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Abstract

The invention discloses a method of integrating selective electrodialysis and selective bipolar membrane electrodialysis to treat salt lake brine to prepare lithium hydroxide. The method comprises thefollowing steps of (1), introducing the salt lake brine with high calcium magnesium content into a univalent selective electrodialysis device to treat the salt lake brine; (2), adding oxalic acid into the brine obtained in step (1) to treat the brine; (3), treating a mother liquor obtained in step (2) with weak acid cation chelating resin; (4), introducing the brine obtained in step (3) into theunivalent selective electrodialysis device to concentrate lithium ions and meanwhile to further reduce the content of magnesium ions; (5), vaporizing the lithium-containing brine obtained in step (4)to obtain lithium chloride solids; (6), preparing the lithium chloride solids obtained in step (5) into a lithium chloride aqueous solution, and adding the lithium chloride aqueous solution into a univalent selective bipolar membrane electrodialysis device to prepare lithium hydroxide and a hydrochloric acid solution. The method and technology are easy to operate, the production cost, pollution tothe environment and energy consumption are greatly reduced, and the purity of produced lithium hydroxide is high.

Description

technical field [0001] The invention belongs to the technical field of inorganic salt preparation, and in particular relates to a method for preparing lithium hydroxide by extracting lithium resources from salt lake brine. Background technique [0002] my country is a country with abundant lithium resources, and lithium and its compounds are important commodities used in metallurgy, nuclear reaction and chemical industry. Especially in recent years, with the rapid development of the lithium battery industry, our demand for lithium has greatly increased. Lithium hydroxide has become a widely used material in current industrial applications, such as additives for the preparation of lithium salts and lithium-based greases, carbon dioxide purification systems for spacecraft, and battery electrolytes. Therefore, the extraction of lithium resources and the production of lithium hydroxide are of great value. However, today's extraction technology for lithium resources is relative...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02C01B7/03
CPCC01D15/02C01B7/035C01P2006/80
Inventor 沈江南裘洋波唐聪姚露
Owner ZHEJIANG UNIV OF TECH
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