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Method and device for extracting bitten lithium chloride

A technology of salt-halide lithium chloride and an extraction method is applied in the field of extraction and device of salt-halide lithium chloride, and can solve the problems of inability to increase the concentration ratio, consumption of large reagents, and low efficiency of drying salt.

Active Publication Date: 2014-04-23
JIANGSU JIUWU HITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems that in the traditional process of extracting lithium from brine, the concentration factor of the reverse osmosis section cannot be increased, the efficiency of drying salt is low, and the precipitation consumes a large amount of reagents.

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  • Method and device for extracting bitten lithium chloride

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Effect of salt lake old brine on Li by aluminum salt adsorbent + After adsorption, then supply deionized water for elution to obtain a desorption solution, when the Mg in the desorption solution is detected 2+ When the content is about 2 g / L, the desorption liquid is sent to the coarse filter to remove the adsorbent particles and sediment, and the permeate enters the primary nanofiltration membrane element for filtration, and the Ca in the desorption liquid 2+ The content is 46.38mg / L, Mg 2+ The content is 2g / L, Li + The content is 412mg / L. After the desorption liquid passes through the primary nanofiltration membrane element, the Ca in the permeate 2+ , Mg 2+ and Li + The content is 25mg / L, 350 mg / L and 556 mg / L. The operating temperature of the primary nanofiltration membrane system is 45°C, the pressure is 1.5 MPa, and the concentration factor is 4 times. The primary nanofiltration membrane permeate enters the secondary nanofiltration membrane element, and the...

Embodiment 2

[0043] Salt Lake Old Brine by Adsorbent + After adsorption, then supply deionized water for elution to obtain a desorption solution, when the Mg in the desorption solution is detected 2+ When the content is about 0.5 g / L, the desorption liquid is sent to the coarse filter to remove the adsorbent particles and sediment, and the permeate enters the primary nanofiltration membrane element for filtration, and the Ca in the desorption liquid 2+ The content is 43.74mg / L, Mg 2+ The content is 0.5 g / L, Li + The content is 432mg / L. After the desorption liquid passes through the primary nanofiltration membrane element, the Ca in the permeate 2+ , Mg 2+ and Li + The content is 22mg / L, 280 mg / L and 389 mg / L. The operating temperature of the primary nanofiltration membrane system is 45°C, the pressure is 1.5 MPa, and the concentration factor is 4 times. The primary nanofiltration membrane permeate enters the secondary nanofiltration membrane element, and the Ca in the secondary nano...

Embodiment 3

[0046] Effect of salt lake old brine on Li by aluminum salt adsorbent + After adsorption, then supply deionized water for elution to obtain a desorption solution, when the Mg in the desorption solution is detected 2+ When the content is about 3 g / L, the desorption liquid is sent to the coarse filter to remove the adsorbent particles and sediment, and the permeate enters the primary nanofiltration membrane element for filtration, and the Ca in the desorption liquid 2+ The content is 49.55mg / L, Mg 2+ The content is 3g / L, Li + The content is 409mg / L. After the desorption liquid passes through the primary nanofiltration membrane element, the Ca in the permeate 2+ , Mg 2+ and Li + The content is 27mg / L, 380 mg / L and 565 mg / L. The operating temperature of the primary nanofiltration membrane system is 45°C, the pressure is 1.5 MPa, and the concentration factor is 4 times. The primary nanofiltration membrane permeate enters the secondary nanofiltration membrane element, and the...

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Abstract

The invention relates to a method and a device for extracting bitten lithium chloride. The method specifically comprises the steps: 1, adsorbing lithium ions by bittern in a lithium-containing salt lake old brine pool through an aluminum salt adsorbing agent, desorbing by using water to obtain a desorbing solution; 2, filtering the desorbing solution by using a coarse filter; 3, filtering permeate of the coarse filter by using a nanofiltration membrane to obtain permeate of the nanofiltration membrane; 4, concentrating the permeate of the nanofiltration membrane by using a reverse osmosis membrane to obtain a reverse osmosis concentrated solution; and 5, carrying out baysalt or evaporating on the reverse osmosis concentrated solution to obtain lithium-containing concentrated brine. According to the method, the problems that the concentration multiple in a reverse osmosis station can not be increased, the baysalt efficiency is low and a plenty of reagents are consumed in precipitation in a conventional process for extracting lithium from brine can be solved, and the obtained lithium chloride solution is high in yield and high in purity.

Description

[0001] technical field [0002] The invention relates to a method and a device for extracting brine lithium chloride, in particular to a method for extracting salt lake lithium chloride by using integrated membrane technology. [0003] Background technique [0004] Lithium chloride is mainly used in air conditioner dehumidifiers, insecticides, lithium battery electrolytes, synthetic fibers, etc., and is also the main raw material for the preparation of lithium metal, lithium carbonate, lithium hydroxide and lithium sulfate. At present, lithium metal has not only become a strategic material of great significance in national defense, but also an important metal closely related to human daily life. The rapid development of the lithium industry has increased the demand for lithium chloride as a raw material. my country's Qinghai and Tibet salt lakes are rich in lithium resources and have high mining value. The traditional lithium chloride preparation process is to use Li ...

Claims

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Application Information

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IPC IPC(8): C01D15/04
Inventor 彭文博王肖虎曹恒霞项娟熊福军杨文银张宏
Owner JIANGSU JIUWU HITECH
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