Method for separating and enriching lithium from magnesium lithium

A magnesium-lithium, enrichment technology, applied in chemical instruments and methods, lithium compounds, alkali metal compounds, etc., can solve the problem of increasing the pressure of magnesium removal and precipitation conversion process, increasing the cost of lithium carbonate products, and high lithium-rich concentrates. problems, to achieve the effect of reducing equipment investment, reducing energy consumption and production costs, and increasing the concentration of lithium ions

Active Publication Date: 2019-05-31
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This patent uses a multi-stage electrodialysis method to concentrate lithium in the lithium-rich eluent, but due to the low concentration of lithium chloride in the eluent, multiple electrodialysis cycles are required, which increases the concentration cycle; and The electrodialysis process consumes a lot of power and the current efficiency is low, which increases the energy consumption of the concentration process and reduces the concentration efficiency; the final lithium-rich concentrated liquid has a high ratio of magnesium to lithium, which increases the pressure of the subsequent magnesium removal and precipitation conversion process. Increased cost of obtaining lithium carbonate products

Method used

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  • Method for separating and enriching lithium from magnesium lithium
  • Method for separating and enriching lithium from magnesium lithium

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] (1) The old brine used comes from a sulfate-type salt lake in Qinghai. The lithium ion content in the old brine is 2.5g / L, and the Mg / Li mass ratio is 50. The old brine is diluted once and enters the multi-media filter to remove impurities such as suspended solids and sediment in the brine, and then enters the organic ultrafiltration equipment for complete removal of impurities. The old brine after complete removal of impurities enters the separation unit through the twice-diluted nanofiltration raw water for magnesium and lithium separation. The old bittern is diluted 15 times in the whole process.

[0078] (2) The pretreated brine enters the separation unit for magnesium and lithium separation, and the magnesium ion content in the obtained nanofiltration fresh water is reduced to 0.12g / L; the lithium ion content is 0.95g / l, and the Mg / Li mass ratio is 0.125.

[0079] The magnesium-lithium separation unit is mainly composed of a monovalent ion-selective nanofiltration...

Embodiment 2

[0092] (1) The old brine used comes from a sulfate-type salt lake in Qinghai. The lithium ion content in the old brine is 2.5g / L, and the Mg / Li mass ratio is 50. The old brine is diluted once and enters the multi-media filter to remove impurities such as suspended solids and sediment in the brine, and then enters the organic ultrafiltration equipment for complete removal of impurities. The old brine after complete removal of impurities is diluted twice and enters the separation unit for separation of magnesium and lithium. The old brine was diluted 15 times in the whole process.

[0093] (2) The pretreated brine enters the separation unit for magnesium and lithium separation, and the magnesium ion content in the obtained nanofiltration fresh water is reduced to 0.23g / L; the lithium ion content is 0.65g / L, and the Mg / Li mass ratio is 0.30.

[0094] The magnesium-lithium separation unit is mainly composed of a monovalent ion-selective nanofiltration membrane with an operating p...

Embodiment 3

[0107] (1) The old brine used comes from a sulfate-type salt lake in Qinghai. The lithium ion content in the old brine is 0.2g / L, and the Mg / Li mass ratio is 180. The old brine is diluted once and enters the multi-media filter to remove impurities such as suspended solids and sediment in the brine, and then enters the organic ultrafiltration equipment for complete removal of impurities. The old brine after complete removal of impurities is diluted twice and enters the separation unit for separation of magnesium and lithium. During the whole process, the old brine was diluted 15 times.

[0108] (2) The pretreated brine enters the separation unit for magnesium and lithium separation, and the magnesium ion content in the obtained nanofiltration fresh water is reduced to 0.32g / L; the lithium ion content is 0.1g / L, and the Mg / Li mass ratio is 3.2.

[0109] The magnesium-lithium separation unit is mainly composed of a monovalent ion-selective nanofiltration membrane with an operati...

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Abstract

The invention discloses a method for separating and enriching lithium from magnesium lithium. The method includes: diluting and filtering salt brine to obtain nanofiltration raw water; putting the nanofiltration raw water into a first nanofiltration separation device for magnesium and lithium separation to obtain first nanofiltration concentrated water and first nanofiltration fresh water; puttingthe first nanofiltration fresh water into a reverse osmosis device for first concentration to obtain reverse osmosis concentrated water and second nanofiltration fresh water; putting the second nanofiltration fresh water into an electrodialysis device for secondary concentration to obtain electrodialysis concentrated water and electrodialysis fresh water, wherein the electrodialysis concentratedwater is a solution enriched with lithium ions. In the method, four membrane separation technologies of ultrafiltration, nanofiltration, reverse osmosis and electrodialysis are coupled in a certain order, and high efficiency separation and enrichment of lithium in the salt brine can be achieved by making full use of the advantages of the various membrane separation technologies.

Description

technical field [0001] The invention relates to a method for separating magnesium and lithium and enriching lithium, belonging to the technical field of solution separation and purification. Background technique [0002] Lithium, as an "important element that promotes world progress", has been listed as a national mineral, and is a key object of macro-control and supervision and management of mineral resources. Lithium resources are widely used in various fields of the national economy such as aerospace, electrical and electronics, and metal smelting. The development and development of lithium resources is the top priority for my country to compete for energy highlands, and it is a major national demand. my country's proven industrial reserves of lithium resources rank second in the world, of which lithium brine accounts for 79% of the total reserves of lithium resources, and the prospective reserves of lithium brine in salt lakes in the Qinghai-Tibet Plateau alone are equiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/00
Inventor 王敏李燕王怀有赵有璟
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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