Method for extracting lithium from old brine in salt field

An old brine and salt field technology, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems such as failure to make effective breakthroughs in key technologies, restricting the development of lithium extraction industry from salt lake brine, and not being promoted, etc. The effect of low production cost, low engineering cost and strong adaptability

Active Publication Date: 2018-12-14
CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, selective adsorption will help to solve this problem, but the key technology of adsorbent has not been effectively broken through; Lithium extraction by calcination has not been promoted due to its energy consumption and pollution; electrodialysis Special devices and permeable membranes are required. The existence of these problems seriously restricts the development of lithium extraction industry from salt lake brine

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Magnesium removal by adsorption:

[0041] a) Adsorption: The old brine flows from the old brine storage tank into the old brine adjustment tank. In the old brine adjustment tank, the clarified old brine and the discharge liquid of washing and washing magnesium (the first operation, there is no discharge liquid of washing magnesium washing, use fresh water) mixed with each other, and pumped into the adsorption tower through the brine pump. The adsorption tower includes Tower No. 1, Tower No. 2, Tower No. 3, and Tower No. 4. Tower No. 1, Tower No. 2, and Tower No. (i.e., the first tower) enters from the upper part, flows out from the bottom of No. 3 tower (that is, the tail tower), and discharges the adsorption tail liquid from No. The tower is switched down to enter the compressed air halogen discharge operation section; after that, No. 2 tower becomes the first tower, and at the same time, No. 4 tower is connected in series behind No. 3 tower, and No. 4 tower become...

Embodiment 2

[0060] The difference between this embodiment and embodiment 1 is only:

[0061] (1) Magnesium removal by adsorption:

[0062] a), the old bittern enters from the top of the first tower to the bottom of the tail tower and flows out, and the running time is 500 minutes;

[0063] c), water washing to remove magnesium uses brackish water with a flow rate of 500m 3 / h, the time spent is 10 minutes;

[0064] (2) Segmented variable speed leaching and elution of lithium:

[0065] a), the flow rate of a section of eluent is 90m 3 / h; the eluent enters from the upper part of the tower and flows out from the bottom, the elapsed time is 3.5 hours, the lithium concentration of the effluent is about 550g / L, and the magnesium concentration is 3g / L;

[0066] b), the flow rate of the second eluent is 200m 3 / h, the eluent enters from the upper part of the tower to the bottom and flows out, and it takes 2 hours;

[0067] c), three-stage leaching, the flow rate of the three-stage leaching...

Embodiment 3

[0078] The difference between this embodiment and embodiment 1 is only:

[0079] (1) Magnesium removal by adsorption:

[0080] a), from the upper part of the first tower to the bottom of the tail tower, the running time is 250 minutes;

[0081] c), fresh water is used for washing and removing magnesium, and the flow rate is 800m 3 / h, the time spent is 20 minutes;

[0082] (2) Segmented variable speed leaching and elution of lithium:

[0083] a), the flow rate of a section of eluent is 50m 3 / h; the eluent enters from the top of the tower and flows out from the bottom, the elapsed time is 2.5 hours, the lithium concentration of the effluent is 500g / L, and the magnesium concentration is 3g / L;

[0084] b), the flow rate of the second eluent is 150m 3 / h, the eluent enters from the upper part of the tower to the bottom and flows out, and it takes 2 hours;

[0085] c), three-stage leaching, the flow rate of the three-stage leaching water is 160m 3 / h, the rinse water enters...

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Abstract

The invention discloses a method for extracting lithium from old brine in a salt field. The method comprises: (1) magnesium adsorption removal, (2) stepwise speed-variable elution of lithium, (3) deepmagnesium adsorption removal based on an ion exchange resin, (4) reverse osmosis and (5) lithium carbonate preparation. The method comprehensively utilizes various processes such as magnesium adsorption removal, stepwise speed-variable elution of lithium, deep magnesium adsorption removal based on an ion exchange resin and reverse osmosis, completely solves the problems of too high magnesium-lithium ratio of the old brine in a salt field, realizes a low production cost and a low building cost and has strong adaptability. The product has lithium carbonate purity reaching to the purity of electronic grade lithium carbonate.

Description

technical field [0001] The invention relates to a method for extracting lithium from old brine in salt fields, in particular to a method for extracting lithium carbonate from old brine in salt fields of chloride type brine by adopting processes such as adsorption and reverse osmosis. Background technique [0002] Lithium metal and lithium salts are important strategic resources of the country and are widely used in aerospace, electronics, metal materials, equipment manufacturing, nuclear energy and national defense industries. The amount of lithium carbonate is huge, and the world's demand for lithium carbonate is still growing every year. Therefore, improving the utilization rate of lithium resources and reducing development costs are of great significance to supporting the development of the national economy. [0003] 70% of the world's lithium resources come from brine. The four largest brine lithium deposits in the world are located in Bolivia, Chile, Argentina and Zab...

Claims

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Application Information

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IPC IPC(8): C01D15/08
CPCC01D15/08C01P2006/80
Inventor 冯跃华杨能红夏循峰徐盛丁扬孙成高
Owner CHANGSHA DESIGN & RES INST OF CHEM IND MIN
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