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

A crystallization, carbonate type technology, applied in the direction of lithium carbonate;/acid carbonate, solution crystallization, etc., can solve the problems of poor heat storage capacity, easy damage to the plastic shed, time-consuming and laborious salt collection, etc. Achieve the effect of improving production efficiency

Inactive Publication Date: 2003-02-26
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

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Effect test

Embodiment 1

[0024] The solar pool lighting area is 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 for insulation.

[0025] Using high-lithium, high-carbonate-brine in salt lakes as raw materials, it is concentrated to obtain Li + 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; pours about 50cm of clean fresh water into the brine layer, and the total depth of the brine and freshwater layers in the solar pond is about 3m. The operation time is from March 19 to May 4, 2002. After 40 days of solar energy storage, the temperature of the solar pool energy storage area reaches about 31.5°C, and the high-lithium mixed salt with a thickness of about 3mm is enriched in the pool and crystallized. The grade of lithium carbonate contained in the mixed salt is 83.1%. During the lithium sinking period, accordi...

Embodiment 2

[0027] The solar pool lighting area is 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 for insulation.

[0028] The brine with high lithium and high carbonate in the salt lake is used as raw material, and after concentration, Li + Lithium-rich brine with a concentration of 1.8g / l controls the depth of the lithium-rich brine in the solar pool to about 1.69m; pours about 40cm of clean fresh water into the brine layer, and the total depth of the brine and freshwater layers in the solar pool is about 2.09m . The operation time is from May 17th to June 9th, 2002. After 23 days of absorbing solar heat and storing heat, the temperature of the solar pool energy storage area reaches about 40°C, and the pool is enriched with high-lithium mixed salt with a thickness of about 3mm, which crystallizes The grade of lithium carbonate contained in the mixed salt is 81.6%. During ...

Embodiment 3

[0030] The solar pool lighting area is 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 foam plastic for heat insulation.

[0031] The brine with high lithium and high carbonate in the salt lake is used as raw material, and after concentration, Li + Lithium-rich brine with a concentration of 1.59g / l, control the depth of lithium-rich brine in the solar pool to about 1.5m; pour about 30cm of clean fresh water into the brine layer, at this time the total depth of brine and freshwater layers in the solar pool is about 1.8m . The operation time is from June 4th to June 30th, 2002. After 26 days of absorbing solar heat and storing heat, the temperature of the solar pool energy storage area reaches about 47°C, and the high-lithium mixed salt with a thickness of about 3mm is enriched in the pool and crystallized. The grade of lithium carbonate contained in the mixed salt is 82.8%. ...

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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 are widely used in modern industry and science and technology. The world's lithium consumption continues to increase. In the world's total lithium resources, brine lithium ore accounts for about 75%, and hard rock lithium ore accounts for about 25%. In my country, brine lithium ore accounts for about 72%, and hard rock lithium ore accounts for 28%. Because the cost of extracting lithium from salt lakes is 1-1.5 times lower than that of hard rocks, the production of lithium salts from salt lakes has surpassed that from hard rock lithium mines. Therefore, the extraction of lithium salts from salt lake brines has become a major development of the world's lithium industry. trend. [0003] Chinese patent 991058...

Claims

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Application Information

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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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