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

A technology of salt lake brine and high magnesium-to-lithium ratio, applied in lithium carbonate;/acid carbonate, chemical instruments and methods, lithium batteries, etc., can solve the problem that there is no universal standard for battery-grade lithium carbonate, and entrainment loss cannot be solved , loss of liquid lithium brine and other problems, to achieve good effect and cost, low separation effect of magnesium and lithium

Active 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

[0019] Chinese patent application 201310571755.2 mentions the use of calcium chloride to reduce the concentration of sulfuric acid in boron-lithium brine to avoid the loss of lithium sulfate sedimentation, but this method cannot solve the entrainment loss caused by the settlement of huge amounts of bischofite in the salt pan, magnesium saturated brine

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] Take the salt lake intercrystalline brine in Uyuni, Bolivia as an example:

[0127] (1) Form boron-lithium brine

[0128] 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

[0155] Take the intergranular brine of Rincon Salt Lake in Argentina as an example:

[0156] (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%.

[0157] Lincoln salt lake (Rincon) intergranular brine composition:

[0158] 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

[0159] The brine composition of Lincol...

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PUM

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Abstract

The invention discloses a method for directly preparing lithium carbonate from salt lake brine with a high magnesium-to-lithium ratio. The method comprises the following steps: 1, further stabilizingbrine 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 theboron and lithium brine to form a boric acid product and lithium brine; 3,4 and 5, allowing the lithium brine to go through three times of refining to obtain a thirdly refined solution; 6, allowing part of the thirdly refined solution to go through a bipolar membrane electrodialyzer to form a lithium lye solution; 7, allowing the rest of the thirdly refined solution to go through a forced evaporator in order to obtain a concentrated lithium solution; 8, allowing the concentrated lithium solution and a refined sodium carbonate solution to go through a high efficiency reactor in order to obtaina lithium carbonate precipitate with uniform granularity; and 9, 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 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 of the batter...

Claims

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Application Information

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IPC IPC(8): C01D15/08C01B35/10H01M4/58H01M6/14H01M10/052
CPCH01M4/5825H01M6/14H01M10/052C01B35/1063C01D15/08C01P2006/80Y02P20/133Y02E60/10
Inventor 马培华
Owner 马培华
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