Method for extracting high-purity lithium salt from lithium-containing brine

A technology for extracting lithium and brine, applied in the field of liquid-liquid extraction, can solve the problems of low product purity, inability to continue normal production, unstable process, etc., and achieve good practicability.

Inactive Publication Date: 2018-06-29
上海易信生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-purity lithium salts with a purity greater than 99.9% can be obtained through the method of the present invention. Further, we apply the reflux extraction theory to the extraction of lithium from salt lakes. For the reflux extraction theory, refer to the literature Chen Guanghua, THE THEORY ANDCALCULATION OF REFLUX EXTRACTION, DOI: 10.13373 / j.cnki.cj rm.1982.01.003., through calculation, targeted design of appropriate theoretical series solved problems such as process instability, low product purity, failure of normal continuous production, etc., thus effectively guiding brine The scientific research and production of lithium extraction have broad application prospects

Method used

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  • Method for extracting high-purity lithium salt from lithium-containing brine
  • Method for extracting high-purity lithium salt from lithium-containing brine
  • Method for extracting high-purity lithium salt from lithium-containing brine

Examples

Experimental program
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Effect test

Embodiment 1

[0061] The lithium-containing brine to be treated is deboronated brine, wherein the initial lithium concentration is 0.3 mol / L, and the magnesium concentration is 5.5 mol / L.

[0062] Use 3M LiCl solution as the exchange liquid to wash the exchange section (also known as the enrichment section), set to reach a lithium salt purity of 99.9% (i.e. Xp=99.9%), full reflux, do not take the product until the equilibrium is taken when starting The final concentration of the lithium salt is obtained as the product. According to the reflux extraction formula, when the separation coefficient of lithium and magnesium is calculated as 50, the theoretical number of stages N=1.766. The exchange section we actually operate is 2 stages. The analysis results show that the lithium salt The purity is 99.95%.

[0063] The process flow diagram of the present embodiment extracting high-purity lithium salt can be found in figure 1 .

[0064] (1) adding the hydrochloric acid solution of ferric chlori...

Embodiment 2

[0071] The lithium-containing brine to be treated is deboronated brine, wherein the initial lithium concentration is 0.3 mol / L, and the magnesium concentration is 5.5 mol / L.

[0072] Use 3M LiCl solution as the exchange liquid to reflux, set the purity of lithium salt to 99.9% (i.e. Xp=99.9%), and the reflux flow to 0.25LεX0. When the separation coefficient of lithium and magnesium is calculated as 50, the theoretical number of stages N=2.2609 , Our actual operating exchange section is grade 4, and the analysis results show that the purity of lithium is 99.99%.

[0073] The technical process of extracting high-purity lithium salt in this embodiment is the same as that in Embodiment 1.

Embodiment 3

[0075] The lithium-containing brine to be treated is deboronated brine, wherein the initial lithium concentration is 0.3 mol / L, and the magnesium concentration is 5.5 mol / L.

[0076] Use 4M LiCl solution as the exchange liquid to reflux, set the purity of lithium salt to 99.9% (that is, Xp=99.9%), and the reflux flow to 0.25LεX0. When the separation coefficient of lithium and magnesium is calculated as 50, the theoretical number of stages N=2.2609 , Our actual operating exchange section is grade 3, and the analysis results show that the purity of lithium is 99.95%.

[0077] The technical process of extracting high-purity lithium salt in this embodiment is the same as that in Embodiment 1.

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Abstract

The invention relates to a method for extracting high-purity lithium salt from lithium-containing brine, which belongs to the technical field of liquid-liquid extraction. The method comprises the following steps: after the extraction step and before the reverse extraction step, an exchanging step is introduced to exchange lithium and an impurity element, wherein an exchanging solution used in theexchanging step is a lithium salt solution. By virtue of the method of the invention, the high-purity lithium salt with the purity greater than 99.9 percent can be obtained, the reflux extraction theory is further applied to the lithium extraction of salt lake, an appropriate theoretical stage can be designed on purpose by virtue of calculation, the problems that the process is instable, the product purity is not high, the normal continuous production cannot be realized and the like can be solved, the scientific research and production for extracting the lithium from the brine can be effectively instructed, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of liquid-liquid extraction, and relates to a method for extracting lithium salt from lithium-containing brine, in particular to a method for producing high-purity lithium salt from high-magnesium-lithium ratio salt lake brine using lithium salt solution reflux extraction technology . Background technique [0002] The cost of lithium extraction from brine is low, and lithium extraction from brine has become the main source of lithium salt industry in the world today. At present, lithium extraction from brine has accounted for 80% of the total lithium-containing products in the world. Major countries include the United States, Argentina, and Bolivia, Chile. [0003] my country is one of the countries with the richest lithium resources in salt lakes in the world. The resources are distributed in the salt lake areas of Tibet and Qinghai. Among them, the lithium resources in Tibet are mainly in carbonate-type sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00C01D15/04
CPCC01D15/00C01D15/04C01P2006/80
Inventor 龚峰陈光华陆文达李剑英
Owner 上海易信生物科技有限公司
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