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Method for preparing lithium chloride by using four-compartment replacement reaction electrodialysis

A replacement reaction and electrodialysis technology, applied in electrodialysis, chemical instruments and methods, lithium halide, etc., can solve the problem of consuming a large amount of hydrochloric acid, and achieve the effect of simplifying the pretreatment process, reducing the degree of dependence, and reducing the difficulty

Pending Publication Date: 2019-11-01
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem solved by the present invention is to provide a method for preparing lithium chloride by four-compartment replacement reaction electrodialysis, which solves the problem of consuming a large amount of hydrochloric acid in the existing method for preparing lithium chloride

Method used

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  • Method for preparing lithium chloride by using four-compartment replacement reaction electrodialysis

Examples

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Embodiment 1

[0030] A method for preparing lithium chloride, specifically comprising the following steps:

[0031] (1) Pulverizing and ball milling the lithium illuminite, and then calcining at 1000°C;

[0032] (2), ball milling the product of step (1) again, adding excess concentrated sulfuric acid, and carrying out sulfuric acid acidification under the condition of 250°C;

[0033] (3), the product of step (2) is dissolved, and an appropriate amount of Ca(OH) is added 2 , filter to remove impurities such as calcium ions, magnesium ions, iron ions, aluminum ions, etc., and the filtrate is mainly lithium sulfate;

[0034] (4), the filtrate of step (3) is passed into the feed compartment II of the four-compartment displacement reaction electrodialysis device, and the sodium chloride solution is passed into the feed compartment IV, and under the action of the electric field force, the feed compartment Lithium ions in compartment II and chloride ions in feed compartment IV pass through the c...

Embodiment 2

[0036] A method for preparing lithium chloride, specifically comprising the following steps:

[0037] (1), first evaporate and concentrate the salt lake brine in the evaporation pond;

[0038] (2), step (1) is concentrated to a certain rate of solution, and calcium hydroxide is added, filtered, and impurities such as calcium and magnesium ions are removed;

[0039] (3), sodium carbonate is added in the filtrate of step (2) again, and reaction generates lithium carbonate and precipitates out, and some soluble impurities in the solution can be removed in the process;

[0040] (4), lithium carbonate that step (3) is obtained is dissolved, then pass into the feeding compartment II of the four-compartment displacement reaction electrodialysis device, and the sodium chloride solution is passed into the feeding compartment IV, under the force of the electric field Under the action, the lithium ions in the feed compartment II and the chloride ions in the feed compartment IV pass thro...

Embodiment 3

[0042] A kind of method for preparing lithium chloride in this embodiment, steps (1)-(3) are identical with embodiment 2, and different steps are specifically:

[0043] (4), the Lithium Retard that step (3) is obtained is added in water, feeds carbon dioxide gas, and Lithium Retard is carbonized and generates Lithium Carbonate; Then feeds into the feeding compartment II of the four-compartment displacement reaction electrodialysis device, sodium chloride The solution passes into the feed compartment IV, and under the action of the electric field force, the lithium ions in the feed compartment II and the chloride ions in the feed compartment IV pass through the cation exchange membrane and the anion exchange membrane respectively, and enter the product compartment Lithium chloride solution is obtained in III, bicarbonate ions in feed compartment II and sodium ions in feed compartment IV pass through anion exchange membrane and cation exchange membrane respectively, and sodium bi...

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Abstract

The invention discloses a method for preparing lithium chloride by using four-compartment replacement reaction electrodialysis. A lithium salt solution, such as lithium sulfate, lithium carbonate or lithium bicarbonate, and a sodium chloride solution are fed into a feeding compartment II and a feeding compartment IV of a four-compartment replacement reaction electrodialysis device, so that under the action of electric field force, lithium ions in the feeding compartment II and chloride ions in the feeding compartment IV respectively pass through the cation exchange membrane and the anion exchange membrane, and a lithium chloride solution is obtained in the product compartment III; in addition, anions in the feeding compartment II and sodium ions in the feeding compartment IV pass through acation exchange membrane and an anion exchange membrane respectively, and a sodium salt solution is obtained in the product compartment I. According to the process, the pretreatment process of the raw materials is simplified, a large amount of hydrochloric acid does not need to be consumed, some impurity ions in the raw materials are removed while lithium carbonate is prepared, the purity of lithium chloride is improved, the difficulty of the aftertreatment process is reduced, and the method is a low-consumption, environment-friendly and recyclable lithium chloride preparation method.

Description

technical field [0001] The invention belongs to the technical field of lithium chloride preparation, and in particular relates to a method for preparing lithium chloride by four-compartment replacement reaction electrodialysis. Background technique [0002] Lithium chloride is an important lithium salt product. Lithium chloride and its derivatives are widely used in controlled nuclear fusion reactions, aluminum-lithium alloys, lithium-ion batteries, nonlinear optical materials in optical communications, and other fields. Especially in the field of lithium-ion battery technology, electrolysis of lithium chloride is currently the only industrial method for producing metal lithium. With the sharp increase in demand for lithium-ion batteries in industries such as electric vehicles, mobile phones, and notebooks, the demand for raw material lithium chloride has increased. Demand, and this trend is becoming more and more obvious, so that the production of lithium chloride shows un...

Claims

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Application Information

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IPC IPC(8): C01D15/04C01D15/06C01D15/08B01D61/48
CPCB01D61/485C01D15/04C01D15/06C01D15/08
Inventor 马准冯军军李宁王小濛徐冬梅高军李梦华
Owner SHANDONG UNIV OF SCI & TECH
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