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Method for preparing lithium hydroxide by using bipolar membrane

A lithium hydroxide and bipolar membrane technology, which can be used in diaphragms, electrolysis processes, electrolysis components, etc., can solve the problems of low current utilization efficiency of bipolar membranes and high production cost of lithium hydroxide

Pending Publication Date: 2021-07-06
安徽南都华铂新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current utilization efficiency of the bipolar membrane used in the existing electrolyzer is low, so that the production cost of lithium hydroxide is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The lithium sulfate solution having a concentration of 35 wt% is added to the anode chamber of the bipolar membrane electrolysis slot, and the lithium hydroxide solution having a concentration of 3% by weight is added to the cathode chamber of the bipolar membrane electrolysis slot, and the electrolysis tank is heated to 54 ° C. ;

[0028] Add 1 L 1 mol / L of dilute sulfuric acid to a mixture of 1 mol / L in the anode chamber of the bipolar membrane electrolytic cell to regulate the pH of the solution in the anode chamber to 2.0; then directly, the bipolar membrane electrolysis channel, and regulate the bipolar film The tank voltage of the electrolytic cell is between 6V, the current density of the regulatory electrolysis tank is 1.5 kA / m. 2 Then start electrolysis, and the lithium ion in the anode chamber gradually moves in the direction of the ion exchange membrane and passes through the ion exchange membrane under the action of electric field power, and is migrated fr...

Embodiment 2

[0031] The concentration of 50 wt% of the lithium sulfate solution was added to the anode chamber of the bipolar membrane electrolysis slot, and the lithium hydroxide solution having a concentration of 4 wt% was added to the cathode chamber of the bipolar membrane electrolysis slot, and the electrolytic tank was heated to 54 ° C. ;

[0032] Add 1 L 1 mol / L of dilute sulfuric acid to a mixture of 1 mol / L in the anode chamber of the bipolar membrane electrolytic cell to regulate the pH of the solution in the anode chamber to 2.0; then directly, the bipolar membrane electrolysis channel, and regulate the bipolar film The tank voltage of the electrolytic cell is between 6V, and the current density of the regulatory electrolytic cell is 1.8kA / m. 2 Then start electrolysis, and the lithium ion in the anode chamber gradually moves in the direction of the ion exchange membrane and passes through the ion exchange membrane under the action of electric field power, and is migrated from ...

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PUM

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Abstract

The invention discloses a method for preparing lithium hydroxide by using a bipolar membrane. The method comprises the following steps: adding a lithium sulfate solution with a concentration of 30-50 wt% into an anode chamber of a bipolar membrane electrolytic bath, and adding a lithium hydroxide solution with a concentration of 3-5 wt% into a cathode chamber of the bipolar membrane electrolytic bath; adding a mixture of dilute sulphuric acid and an organic reagent into the anode chamber of the bipolar membrane electrolytic bath, and regulating the pH value of the solution in the anode chamber to 2.0-3.0; then supplying direct current to the bipolar membrane electrolytic bath, and then starting electrolysis; and allowing the lithium hydroxide solution to flow out of a liquid outlet of the cathode chamber, subjecting the lithium hydroxide solution flowing out of the cathode chamber to freezing sodium separation treatment and conducting post-treatment so as to obtain a battery-grade lithium hydroxide product. By means of the method, defects in the prior art are overcome, current utilization efficiency in an electrolysis process is improved, and production cost is reduced.

Description

Technical field [0001] The present invention relates to the preparation of lithium hydroxide, and is specifically a method of preparing lithium hydroxide using a bipolar membrane. Background technique [0002] Lithium hydroxide is an important chemical raw material is widely used in the production of glass / ceramics, air refrigeration systems, lithium batteries and nuclear power generation and lithium ions or lithium polymer reservoirs. Lithium hydroxide is generally required. purity. However, lithium resources are generally extracted from lithium ore or brine, and since the lithium concentration in these resources is low, and generally contain a large amount of calcium magnesium ions, this makes it more difficult to extract lithium of high purity. The preparation method of currently commonly used lithium hydroxide is a precipitation method and an electrolyzed method, wherein the electrolytic method is a new type of lithium hydroxide, and is high purity by lithium chloride, lith...

Claims

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Application Information

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IPC IPC(8): C25B1/16C25B13/04
CPCC25B1/16C25B13/04
Inventor 朱建楠朱昊天吴国庆
Owner 安徽南都华铂新材料科技有限公司