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Method for preparing battery-grade lithium salt through recovering lithium bromide waste liquor

A lithium bromide, battery-grade technology is applied in the field of recovering lithium bromide waste liquid to prepare battery-grade lithium salt, which can solve problems such as waste of lithium elements, and achieve the effects of low cost, simple process and considerable economic benefits.

Active Publication Date: 2017-02-15
山东泰普锂业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This lithium bromide regeneration treatment method needs to supplement lithium carbonate and lithium hydroxide, resulting in waste of lithium elements

Method used

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  • Method for preparing battery-grade lithium salt through recovering lithium bromide waste liquor
  • Method for preparing battery-grade lithium salt through recovering lithium bromide waste liquor

Examples

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Effect test

Embodiment 1

[0031] The invention provides a method for preparing battery-grade lithium salt by reclaiming lithium bromide waste liquid. The method is carried out according to the following steps:

[0032] S101: Sodium phosphate lithium precipitation: add 5% sodium phosphate, 362.9g, which is 5% more than the amount of lithium bromide to 1000g of lithium bromide waste liquid with a concentration of 55%, stir for lithium precipitation, and filter after lithium precipitation for 3 hours to obtain lithium phosphate residue ;

[0033] S102: Slurry calcification: Add the lithium phosphate slag to water, control the liquid-solid ratio of water and lithium phosphate slag to 3:1 and start stirring, then add 233.9g of calcium hydroxide, react for 2 hours and filter to obtain Lithium solution;

[0034] S103: Purification and removal of impurities: in the lithium hydroxide solution according to the volume of lithium hydroxide solution 2kg / m 3 Adding soda ash to purify and remove impurities, filter ...

Embodiment 2

[0037] The invention provides a method for preparing battery-grade lithium salt by reclaiming lithium bromide waste liquid. The method is carried out according to the following steps:

[0038] S101: Sodium phosphate lithium precipitation: Add 8% sodium phosphate, i.e. 373.3g, which is 8% more than lithium bromide to 1000g of lithium bromide waste liquid with a concentration of 55%, stir for lithium precipitation, and filter after lithium precipitation for 2 hours to obtain lithium phosphate residue ;

[0039] S102: Slurry calcification: Add the lithium phosphate slag to water, control the liquid-solid ratio of water and lithium phosphate slag to 5:1 and start stirring, then add 245.6g of calcium hydroxide, react for 3 hours and filter to obtain Lithium solution;

[0040] S103: Purification and removal of impurities: in the lithium hydroxide solution according to the volume of lithium hydroxide solution 2kg / m 3 Adding soda ash to purify and remove impurities, filter after rea...

Embodiment 3

[0043] The invention provides a method for preparing battery-grade lithium salt by reclaiming lithium bromide waste liquid. The method is carried out according to the following steps:

[0044] S101: Sodium phosphate lithium precipitation: Add 8% sodium phosphate, 352.9g, which is 8% more than lithium bromide to 1000g of lithium bromide waste liquid with a concentration of 52%, stir for lithium precipitation, and filter after lithium precipitation for 3 hours to obtain lithium phosphate solid ;

[0045] S102: Slurry calcification: add the lithium phosphate slag into water, and control the liquid-solid ratio of water and lithium phosphate solid to 5:1, then add 331.7g of calcium chloride, react for 2 hours and filter to obtain lithium chloride solution ;

[0046] S103: Purify and remove impurities: add 2kg / m of the volume of the lithium chloride solution to the lithium chloride solution 3 Soda ash was added for purification and impurity removal, and after reacting for 2 hours,...

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Abstract

The invention provides a method for preparing a battery-grade lithium salt through recovering lithium bromide waste liquor. The method comprises the steps of carrying out lithium settling by sodium phosphate, carrying out conditioned calcification, carrying out purified impurity-removal and carrying out concentrated lithium precipitation. According to the method, phosphate is used for replacing lithium ions in lithium bromide, lithium phosphate residues, which are insoluble to water, are converted to a lithium salt solution, which is soluble to water, by adopting a calcium salt, and finally, the lithium salt product is precipitated through heated concentration. According to the method for preparing the lithium salt through recovering the lithium bromide waste liquor, provided by the invention, the process is simple, the cost is low, and a high-price element, i.e., lithium can be effectively recovered from the lithium bromide waste liquor, so that the method not only has considerable economic benefit, but also has important social significance.

Description

technical field [0001] The invention relates to the technical field of recovering and extracting lithium from lithium-containing waste liquid, in particular to a method for recovering lithium bromide waste liquid to prepare battery-grade lithium salt. Background technique [0002] Lithium bromide, molecular formula: LiBr. Lithium bromide is a salt, white crystal, soluble in water and alcohol, non-toxic, chemically stable, and will not deteriorate. Lithium bromide is an efficient water vapor absorbent and air humidity regulator. In the refrigeration industry, lithium bromide is widely used as an absorption refrigerant. In lithium bromide absorption refrigerators, lithium bromide aqueous solution is used as the working medium, in which water is the refrigerant and lithium bromide is the absorbent. [0003] When the lithium bromide refrigerator has been used for a certain number of years, due to the influence of air tightness and temperature factors inside the unit, the quali...

Claims

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Application Information

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IPC IPC(8): C01D15/02C01D15/04
CPCC01D15/02C01D15/04C01P2006/80
Inventor 王占前康如金亓亮李秋菊吕延鹏
Owner 山东泰普锂业科技有限公司
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