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Method for accelerating crystallization of lithium carbonate in salt lake brine

A salt lake brine and lithium carbonate technology, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve problems such as dependence on natural weather, achieve the effects of reducing nucleation work, reducing transportation difficulty, and easy operation

Active Publication Date: 2015-01-21
TIBET JINHAO INVESTMENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current accelerated crystallization method is mainly the natural evaporation of solar pools. This method focuses on using sunlight to increase the temperature of brine and accelerate the precipitation of mineral salts. However, this method relies heavily on natural weather and is affected by factors such as sunlight intensity and wind and rain. However, it still has not fundamentally changed the situation of "depending on the sky for food"

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Using brine with high lithium and high carbonate in salt lake water as raw material, it is concentrated to obtain Li + Lithium-rich brine with a concentration of 2.0g / L, control the depth of lithium-rich brine in the brine pool to about 2.0 meters; keep the temperature of the brine at 50°C, when Li in the brine pool + When the concentration reaches 3.5g / L, ultrasonic vibration with a total power of 20KW and a frequency of 50KHZ is used for 1 hour. During the ultrasonic vibration, the seed crystals with a particle size of 200 mesh are evenly sprinkled in by projection. After 7 days, the total mass of the added seed crystals The quality of brine in the brine pool is 0.5‰, and the brine in the brine pool is extracted to obtain 22 tons (dry weight) of lithium carbonate raw ore with a lithium carbonate grade of 61%.

Embodiment 2

[0021] Using brine with high lithium and high carbonate in salt lake water as raw material, it is concentrated to obtain Li + Lithium-rich brine with a concentration of 2.0g / L, control the depth of lithium-rich brine in the brine pool to about 2.0 meters; keep the temperature of the brine at 55°C, when Li in the brine pool + When the concentration reaches 3.5g / L, ultrasonic vibration with a total power of 50KW and a frequency of 200KHZ is used for 1.5 hours. During the ultrasonic vibration, seeds with a particle size of 240 mesh are evenly sprinkled in by means of projection. After 7 days, the total mass of the added seeds The quality of the brine in the brine pool is 1.0‰, and the brine in the brine pool is extracted to obtain 26 tons (dry weight) of lithium carbonate raw ore with a lithium carbonate grade of 63%.

Embodiment 3

[0023] Using brine with high lithium and high carbonate in salt lake water as raw material, it is concentrated to obtain Li + Lithium-rich brine with a concentration of 2.0g / L, control the depth of lithium-rich brine in the brine pool to about 2.0 meters; keep the temperature of the brine at 60°C, when Li in the brine pool + When the concentration reaches 3.5g / L, ultrasonic oscillation with a total power of 20KW and a frequency of 200KHZ is used for 1 hour. During the ultrasonic oscillation, seeds with a particle size of 280 mesh are evenly sprinkled in by projection. After 7 days, the total mass of the added seeds The quality of brine in the brine pool is 1.5‰, and the brine in the brine pool is extracted to obtain 24 tons (dry weight) of lithium carbonate raw ore with a lithium carbonate grade of 62%.

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Abstract

The invention discloses a method for accelerating crystallization of lithium carbonate in salt lake brine. According to the method disclosed by the invention, ultrasonic vibration is creatively introduced into the crystallization process of Li2CO3 in the salt lake brine so as to provide additional energy for nucleation crystallization of the Li2CO3, reduce nucleation power required for the crystallization of the Li2CO3 and improve the crystallization efficiency of the Li2CO3. The method has the advantages of easiness in operation and outstanding effects. By adding Li2CO3 raw ore crystal seeds, the crystallization efficiency of the Li2CO3 can be further improved, the introduction of new impurities in a product can be avoided, the difficulty in transportation of the crystal seeds can be reduced, and the method is particularly suitable for remote mining areas. The method disclosed by the invention is economic and environment-friendly, and the pollution to the environment can be avoided.

Description

technical field [0001] The invention relates to a method for accelerating crystallization, in particular to a method for accelerating the crystallization of lithium carbonate in salt lake brine. Background technique [0002] Salt lakes contain a variety of mineral salts and are an important source of mineral salts. However, the content of mineral salts in salt lakes is generally low, making it difficult to exploit and utilize them on a large scale. In recent years, the mining techniques are mainly salt lake water sun-salting method, ore deposit mining and other methods, among which sun-salting method is the most environmentally friendly mining method. In the process of mining mineral salt by solar salt method, the crystallization operation directly affects the mining efficiency. Generally speaking, salt lake brine has to go through multiple processes such as brine making, concentration, and crystallization. The production cycle is as long as 10 months, and the production ef...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/08
Inventor 易丹青王斌刘会群肖丽华唐聪曾雄朱彬元余昊
Owner TIBET JINHAO INVESTMENT
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