Lithium carbonate crystal separating process from carbonate-type bittern by means of solar battery

A technology of crystallization and carbonate type, applied in the direction of lithium carbonate;/acid carbonate, solution crystallization, etc., can solve the problems of poor heat storage capacity, increased production cost, time-consuming and labor-intensive salt collection, etc. Achieve the effect of improving production efficiency

Inactive Publication Date: 2004-12-15
SALT LAKE & HOT WATER RESOURCE RES DEV CENT CHINESE ACAD OF GEOLOGICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the unfavorable factors of the plastic shed crystallization pool are: small volume, less brine treatment, time-consuming and labor-intensive salt collection; greatly affected by sunlight, poor heat storage capacity, and large temperature difference between morning and evening in the shed, resulting in rock salt, water alkali, etc. Crystallization affects the purity of lithium salts; in addition, due to the high wind and snow in plateau areas, the wind and snow can easily damage the plastic shed, which increases the production cost

Method used

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  • Lithium carbonate crystal separating process from carbonate-type bittern by means of solar battery

Examples

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Effect test

Embodiment 1

[0024] Sun Pool lighting area 1936 meters 2 , The slope ratio is 1:1, the inner wall of the pool is covered with black geomembrane as a liner, and the bottom of the pool is made of magnesite as a heat insulation layer.

[0025] Using high-lithium and high-carbonate brine in the salt lake as a raw material, it is concentrated to obtain Li + The lithium-rich brine with a concentration of 2.64g / l controls the depth of the lithium-rich brine in the solar pond to about 2.5m; pour clean fresh water about 50cm on the brine layer, and the total depth of the brine and freshwater layer in the solar pond is about 3m. The operation time was from March 19 to May 4, 2002. After 40 days of absorbing solar heat storage, the temperature in the solar pool energy storage area reached about 31.5℃, and the pool was enriched with high lithium mixed salt with a thickness of about 3mm, and crystallized The grade of lithium carbonate in the mixed salt is 83.1%. During the lithium sinking period, according...

Embodiment 2

[0027] Sun Pool lighting area 1936 meters 2 , The slope ratio is 1:1, the inner wall of the pool is covered with black geomembrane as a liner, and the bottom of the pool is made of magnesite as a heat insulation layer.

[0028] Using high-lithium and high-carbonate brine in the salt lake as a raw material, it is concentrated to obtain Li + The lithium-rich brine with a concentration of 1.8g / l controls the depth of the lithium-rich brine in the solar pond to about 1.69m; pour clean fresh water about 40cm on the brine layer, and the total depth of the brine and freshwater layer in the solar pond is about 2.09m . The operation time was from May 17th to June 9th, 2002. After 23 days of absorbing solar heat storage, the temperature of the solar pool energy storage area reached about 40℃, and the pool was enriched with high-lithium mixed salt with a thickness of about 3mm. The grade of lithium carbonate in the mixed salt is 81.6%. During the lithium sinking period, according to the evap...

Embodiment 3

[0030] Sun Pool lighting area 1936 meters 2 , The slope ratio is 1:1, the inner wall of the pool is covered with black geomembrane as a liner, and the bottom of the pool is made of foamed plastic as an insulation layer.

[0031] Using high-lithium and high-carbonate brine in the salt lake as a raw material, it is concentrated to obtain Li + Lithium-rich brine with a concentration of 1.59g / l, control the depth of lithium-rich brine in the solar pond to about 1.5m; pour clean fresh water about 30cm on the brine layer, and the total depth of the brine and freshwater layer in the solar pond is about 1.8m . The operation time was from June 4th to June 30th, 2002. After 26 days of absorbing solar heat storage, the temperature of the solar pool energy storage area reached about 47℃, and the pool was enriched with high lithium mixed salt with a thickness of about 3mm. The lithium carbonate grade of the mixed salt is 82.8%. During the lithium sinking period, according to the evaporation si...

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Abstract

The present invention is a method of utilizing solar pond as crystallizing pond for separating lithium carbonate crystal from carbnate-type bittern. The solar pond with lighting area of 1000-10000 sq m and depth of 3-4 m has raw material of bittern as working medium and is built with clay enclosure, sandwith structure of plastic film and hydromagnesite in the bottom, and black geotechnical membrane or high-density polyethylene or polyvinyl chloride lining laid on the internal wall. By combining the heat accumulation of solar pond and the separation of lithium carbonate, great amount of lithium carbonate is deposited and mixed salt with lithium carbonate content over 80% may be produced at low cost.

Description

Technical field [0001] The invention belongs to a method for crystallizing lithium from carbonate type brine. Background technique [0002] Lithium is the lightest metal element and has a series of unique physical and chemical properties. Therefore, lithium and its salts have a wide range of uses in modern industry and science and technology, and the world's lithium consumption is on a continuous increase. In the world's total lithium resources, brine lithium mines account for about 75%, hard rock lithium mines account for about 25%; my country's brine lithium mines account for about 72%, and hard rock lithium mines account for 28%. Because the cost of extracting lithium from salt lakes is more than twice lower than that of hard rock, the current production of lithium salt from salt lakes has surpassed the production of lithium salt from hard rock lithium mines. Therefore, the extraction of lithium salt from salt lake brines has become a major trend in the development of the worl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D9/02C01D15/08
Inventor 郑绵平卜令忠邓月金乜贞罗莎莎张永生赵元艺黄维农王岳杰
Owner SALT LAKE & HOT WATER RESOURCE RES DEV CENT CHINESE ACAD OF GEOLOGICAL SCI
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