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Method for preparing lithium hydroxide by industrial-grade soluble lithium salt

A lithium hydroxide, soluble technology, applied in the direction of lithium oxide;/hydroxide, etc., can solve the problems of inability to obtain battery-grade lithium hydroxide, high production cost, and generation of calcium carbonate solid waste.

Active Publication Date: 2019-04-26
BEIJING TINGRUN MEMBRANE TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process has high energy consumption, large material circulation and high production cost
[0005] Disadvantages: The product quality is average, and a large amount of calcium carbonate solid waste is generated
This method is currently used in domestic production, but lithium sulfate must be pure in this method, otherwise battery-grade lithium hydroxide cannot be obtained

Method used

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  • Method for preparing lithium hydroxide by industrial-grade soluble lithium salt
  • Method for preparing lithium hydroxide by industrial-grade soluble lithium salt
  • Method for preparing lithium hydroxide by industrial-grade soluble lithium salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045]The industrial-grade lithium chloride solution is successively adjusted to pH 13 by lithium hydroxide, plate and frame filtration (the pressure of plate and frame filtration is 1.6 MPa, and the aperture of the filter frame is 5 microns), multi-media filtration (activated carbon, quartz sand and porous ceramics), ultrafiltration (pore size is 0.02 micron) and chelating resin adsorption, to obtain the pre-electrolyte;

[0046] The pre-electrolyte is carried out by bipolar membrane electrolysis (bipolar membrane cation exchange layer (N-type membrane), interfacial hydrophilic layer (catalyst layer) and anion-exchange layer (P-type membrane) are compounded and made, and the voltage of electrolysis is every pair The membrane is 1.5V, and the current density of electrolysis is 300A / m 2 , Lithium hydroxide was obtained by evaporation and crystallization once.

Embodiment 2

[0048] The industrial-grade lithium sulfate solution is successively adjusted to pH 13 by lithium hydroxide, plate and frame filtration (the pressure of the plate and frame filtration is 3 MPa, and the aperture of the filter frame is 8 microns), multi-media filtration (activated carbon, quartz sand and porous ceramics etc.), after ultrafiltration (pore size is 0.02 micron) and chelating resin adsorption, obtain pre-electrolyte;

[0049] The pre-electrolyte is carried out by bipolar membrane electrolysis (bipolar membrane cation exchange layer (N-type membrane), interfacial hydrophilic layer (catalyst layer) and anion-exchange layer (P-type membrane) are compounded and made, and the voltage of electrolysis is every pair The membrane is 2V, the current density of the electrolysis is 500A / m 2 , Lithium hydroxide was obtained by evaporation and crystallization once.

Embodiment 3

[0051] Adjust the pH value of industrial-grade lithium sulfate to 13 through lithium hydroxide, plate and frame filtration (the pressure of plate and frame filtration is 0.6 MPa, and the pore size of the filter frame is 10 microns), multimedia filtration (activated carbon, quartz sand, porous ceramics, etc.) etc.), after ultrafiltration (pore size is 0.02 micron) and chelating resin adsorption, obtain pre-electrolyte;

[0052] The pre-electrolyte is carried out by bipolar membrane electrolysis (bipolar membrane cation exchange layer (N-type membrane), interfacial hydrophilic layer (catalyst layer) and anion-exchange layer (P-type membrane) are combined to make, and the voltage of electrolysis is every The membrane is 2.5V, the current density of the electrolysis is 800A / m 2 , Lithium hydroxide was obtained by evaporation and crystallization once.

[0053] The liquid before and after the adsorption of embodiments 1-2 chelating resin is analyzed, and the results are shown in ta...

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Abstract

The invention provides a method for preparing lithium hydroxide by industrial-grade soluble lithium salt and belongs to the field of preparation of lithium hydroxide. The lithium hydroxide is preparedby taking the industrial-grade soluble lithium salt as a raw material; impurities, calcium, magnesium, aluminum, iron and other ions in the industrial-grade soluble lithium salt are removed through pH value regulation, plate and frame filtration, multi-medium filtration, ultra-filtration and chelate resin adsorption treatment; the plate and frame filtration can separate solid from liquid; the multi-medium filtration is used for removing suspended matters, colloids, organic matters and the like; the ultra-filtration can further reduce the contents of residual COD, the suspended matters and macromolecular dissolved matters to realize the purification and the separation of the liquid; chelate resin enables the content of high-valent ions in the liquid to meet the bipolar membrane water ingress requirements; anions in a pre-electrolyte migrates to an acid chamber and are combined with hydrogen ions decomposed by the surface of a bipolar membrane to form dilute acids; lithium ions in the pre-electrolyte migrate to an alkaline chamber and are combined with hydroxyl ions decomposed by the surface of the bipolar membrane to generate the lithium hydroxide.

Description

technical field [0001] The invention belongs to the technical field of lithium hydroxide preparation, in particular to a method for preparing lithium hydroxide from an industrial-grade soluble lithium salt. Background technique [0002] In the traditional process, the methods for preparing lithium hydroxide mainly include the following: [0003] 1) Limestone roasting process [0004] The lithium-containing ore (spodumene or lepidolite) is mixed with lime powder or limestone according to a certain mass ratio and finely ground. Then the ground slurry is sent to the rotary kiln for calcination, and the sintered block is decomposed with water to obtain lithium hydroxide. The process has high energy consumption, large material flow rate and high production cost. [0005] Disadvantages: The product quality is average, and a large amount of calcium carbonate solid waste is produced. [0006] 2) Lithium carbonate causticization process [0007] Refined milk of lime Ca(OH) 2 Mi...

Claims

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Application Information

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IPC IPC(8): C01D15/02
CPCC01D15/02
Inventor 郭铭潇张丽丽李辉谭渊清
Owner BEIJING TINGRUN MEMBRANE TECH DEV
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