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Method for directly preparing battery grade lithium carbonate from salt lake brine with high magnesium-to-lithium ratio

A technology of salt lake brine, high magnesium-to-lithium ratio, applied in lithium carbonate;/acid carbonate, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of battery-grade lithium carbonate without general standards, and achieve good Effectiveness and cost, improved lithium ion yield, low cost effect

Pending Publication Date: 2018-07-31
马培华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different battery materials have different manufacturing requirements and manufacturing processes, resulting in no universal standard for battery-grade lithium carbonate in the world.

Method used

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  • Method for directly preparing battery grade lithium carbonate from salt lake brine with high magnesium-to-lithium ratio
  • Method for directly preparing battery grade lithium carbonate from salt lake brine with high magnesium-to-lithium ratio
  • Method for directly preparing battery grade lithium carbonate from salt lake brine with high magnesium-to-lithium ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Take the salt lake intercrystalline brine in Uyuni, Bolivia as an example:

[0073] (1) Form boron lithium brine

[0074] The intercrystalline brine of the salt lake in Uyuri Salt Lake in Bolivia is extracted for evaporation and concentration in the salt field. During the evaporation process, the tail liquid (mainly magnesium chloride solution) after lithium extraction in the workshop is used for magnesium supplementation in the salt field. After the potassium extraction is formed, the brine is introduced into the stabilization pool for evaporation and stabilization to form a boron-lithium brine with stable components. Focus on monitoring the concentration of magnesium ions and sulfate radicals. In order to save investment, the stabilization pool is also used as a brine storage pool. According to the production plan and ambient temperature and sunshine conditions, the stable components of the brine after potassium extraction are stored by means of adjusting evaporation...

Embodiment 2

[0097] Take the intergranular brine of Rincon Salt Lake in Argentina as an example:

[0098] (1) Collect the intercrystalline brine from Lincoln Salt Lake in Argentina, concentrate it by evaporation, and control it before a large amount of bischofite is precipitated to obtain the boron-lithium brine component. This brine can also be further concentrated to a lithium ion concentration of 6.42g / L and a boron content of 4.65g / L. However, the concentration process will cause the loss of a large amount of lithium precipitated from bischofite and the precipitation of a large amount of lithium sulfate, and the overall loss of lithium ions exceeds 30%.

[0099] Lincoln salt lake (Rincon) intergranular brine components:

[0100] ingredients

Li +

K +

Na +

Mg 2+

Ca 2+

B 3+

SO 4 2-

Cl -

proportion

g / L

0.40

7.51

115.95

3.42

0.49

0.33

12.52

188.43

1.204

[0101] The brine composition of Lincoln...

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PUM

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Abstract

The invention discloses a method for directly preparing battery grade lithium carbonate from salt lake brine with a high magnesium-to-lithium ratio. The method comprises the following steps: 1, further stabilizing brine obtained after potassium extraction of a salt pan in a stabilization pond to form boron and lithium brine with low potassium and sodium content; 2, carrying out boron extraction treatment on the boron and lithium brine to form a boric acid product and lithium brine; 3, allowing the lithium brine to go through an electrodialysis membrane with a monovalent ion selection functionto obtain a primary refined solution; 4, causticizing the primary refined solution for magnesium removal to obtain a secondary refined solution; 5, allowing the secondary refined solution to go through an ion exchanger to remove calcium to obtain a thirdly refined solution; 6, allowing the thirdly refined solution to go through a forced evaporator in order to obtain a concentrated lithium solution; 7, allowing the concentrated lithium solution and a refined sodium carbonate solution to go through a high efficiency reactor in order to obtain a lithium carbonate precipitate with uniform granularity; and 8, cleaning the lithium carbonate precipitate, drying the cleaned precipitate, and packaging the dried precipitate to obtain a battery grade lithium carbonate product. The method has the advantages of good maneuverability, and great increase of the recovery rate of lithium ions.

Description

technical field [0001] The invention belongs to the field of inorganic salt chemical industry. Specifically, the invention relates to a method for directly producing battery-grade lithium carbonate from high-magnesium-lithium ratio salt lake brine. Background technique [0002] Lithium is the most important energy metal and an indispensable strategic resource in modern industry. It plays an important role in battery chemistry, glass ceramics, aviation metal, nuclear industry, lubricating grease and refrigerant, etc. In particular, the explosive development of lithium batteries in recent years has led to a rapid expansion of global lithium consumption. 80% of the world's lithium production capacity comes from salt lakes, and the easy-to-develop low-magnesium-lithium ratio salt lakes have been fully exploited. The rapidly growing demand for lithium urgently requires the extraction of battery-grade lithium carbonate from high-magnesium-lithium ratio salt lakes to meet the needs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C01B35/10
CPCC01B35/1063C01D15/08C01P2006/80
Inventor 马培华
Owner 马培华