Solar pond lithium extraction method

A solar pool and lithium-rich technology, which is applied in the field of lithium extraction from solar pools, can solve the problems of low lithium yield and achieve the effects of improving crystallization efficiency, wide application prospects, and simple steps

Active Publication Date: 2020-07-31
INST OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI +1
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Problems solved by technology

[0005] In view of the above-mentioned analysis, the present invention aims to provide a method for extracting lithium from solar ponds, in order to solve the existing problem of high Li in carbonate type salt lakes. + low CO 3 2- Halogen is used as a raw material, and the lithium yield is low when using the traditional solar pool heating method to analyze lithium

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Effect test

Embodiment 1

[0077] The A1 solar pool of a workshop in the Zabuye mining area of ​​Tibet was selected to carry out the disturbance experiment (no sodium carbonate was added, only disturbance). The bottom area of ​​A1 solar pool is 2500m 2 , the brine filling depth is 2m, and two submersible pumps are placed diagonally at a distance of 50cm from the bottom of the A1 solar pool. The power of the submersible pump is 3kw, and the flow control of the submersible pump is 50m 3 / h. The temperature rise of the concentrated lithium-rich brine in the A1 solar pool is basically stable, and the first mechanical disturbance begins when the temperature of the brine reaches 40°C. The first cycle lasts a total of 64 hours. A second mechanical disturbance was performed after an interval of two months, and the second cycle lasted a total of 50 hours. Before and after the first and second disturbances, longitudinal observation and sampling of the A1 solar pool and brine Li + The test analysis of concentra...

Embodiment 2

[0088] The B1 solar pond of a workshop in the Zhabuye mining area of ​​Tibet was selected, and the lithium extraction method of the solar pond of the present invention was used to carry out experiments on the B1 solar pond by increasing the temperature of the traditional solar pond and supplementing the carbonate precipitation method. Among them, the original halogen Li + The concentration is 2.03g / L, CO 3 2- The concentration is 19.46g / L, which is a typical high Li + low CO 3 2- into brine. The bottom area of ​​B1 solar pool is 2500m 2 , the depth of brine filling is 2m, and then a layer of fresh water with a thickness of 1m is laid on the surface, and it is left to stand for several days until the salt gradient solar pool is completely formed and enters the stage of stable temperature rise and lithium analysis. Alkali operation. The method of adding alkali adopts the first method, adding 105 tons of alkali in total, and injecting the lye into the solar pool through th...

Embodiment 3

[0093] The B2 solar pond of a workshop in the Zhabuye mining area of ​​Tibet was selected, and the method for extracting lithium from the solar pond of the present invention was used to carry out experiments on the B2 solar pond by increasing the temperature of the traditional solar pond and supplementing the carbonate precipitation method. Among them, the original halogen Li + The concentration is 2.02g / L, CO 3 2- The concentration is 27.73g / L, which belongs to high Li + low CO 3 2- into brine. The bottom area of ​​B2 solar pool is 2500m 2 . The method of adding alkali adopts the second method, a total of 108.45 tons of alkali is added, and the alkali solution and brine are mixed in the brine channel and then poured into the solar pond together. The prepared Na 2 CO 3 The saturated solution is injected into the brine delivery channel, mixed with the formed brine in the brine delivery channel, and then a water pump is used. The power of the submersible pump is 3kw, and...

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Abstract

The invention relates to a solar pond lithium extraction method, belongs to the technical field of carbonate type salt lake lithium extraction, and solves the problem that the lithium yield of methodsusing carbonate type salt lake high-Li<+> and low-CO3<2-> brine as raw materials and using a traditional solar pond heating lithium precipitation method is low. The disclosed method comprises the following steps: step 1, injecting a Na2CO3 saturated solution into the bottom of a solar pond to obtain a salt gradient solar pond of which the bottom is a mixed solution of the Na2CO3 saturated solution and a lithium-rich brine; step 2, completely separating out lithium carbonate in the salt gradient solar pond after injecting the Na2CO3 saturated solution into the bottom of the salt gradient solarpond; and step 3, implementing bittern discharging operation, and collecting the lithium carbonate mixed salt. The method is suitable for all solar ponds, is easy to operate, is economical and environment-friendly, and can greatly improve the yield and grade of lithium carbonate mixed salt in a single pond.

Description

technical field [0001] The invention relates to the technical field of lithium extraction from carbonate type salt lakes, in particular to a method for extracting lithium from a solar pool. Background technique [0002] There are many methods for extracting lithium carbonate from salt lake brine, mainly including precipitation method, solvent extraction method, ion exchange method, carbonization method, calcination and leaching method, etc. Among them, the carbonate precipitation method uses solar energy to naturally evaporate and concentrate lithium-containing brine in an evaporation pool. When the lithium content reaches an appropriate concentration, lime is used to remove residual magnesium impurities, and then sodium carbonate is added to precipitate lithium in the form of lithium carbonate. The carbonate precipitation method is suitable for extracting lithium from salt lake brine with low magnesium-lithium ratio. It has the advantages of simple process and low cost. It ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
CPCC01D15/08Y02P20/133
Inventor 卜令忠伍倩余疆江乜贞王云生仁青罗布何涛洛布占堆普布次仁
Owner INST OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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