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Method for separating and enriching lithium

An enrichment and separation device technology, applied in semi-permeable membrane separation, chemical instruments and methods, lithium compounds, etc., can solve problems such as low lithium ion yield, improve enrichment efficiency, improve rationality, and reduce energy consumption Effect

Active Publication Date: 2020-01-10
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

Although this method reduces the magnesium-lithium ratio of salt lake brine to a certain extent and realizes the enrichment of lithium in brine, the lithium ion content in the finally obtained lithium-rich brine has not yet reached the lithium concentration required for the preparation of high-purity lithium salt. Continue the enrichment and concentration of lithium and the yield of lithium ions is low during the separation process

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  • Method for separating and enriching lithium
  • Method for separating and enriching lithium
  • Method for separating and enriching lithium

Examples

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Embodiment 1

[0030] This embodiment provides a method for separating and enriching lithium, combiningfigure 1 Shown is the flow process of this embodiment, the method of this embodiment includes the following steps:

[0031] Pre-treatment: Dilute the above-mentioned Yantian old brine for the first time, and the dilution factor is 2.5 times. The first diluted Yantian old brine is first sent to a multimedia filter to remove some mechanical impurities such as silt, and then sent to an organic supernatant. Filtration system for complete removal of impurities, and then the second dilution, the dilution factor of the second dilution is 7.5 times, to obtain the pre-treated brine.

[0032] Separation: The pretreated brine is separated by a nanofiltration separation system to obtain nanofiltration fresh water and nanofiltration concentrated water. The concentration of lithium ions in the nanofiltration fresh water is 1.1g / L, and the concentration of magnesium ions is reduced to 0.13g / L , the mass r...

Embodiment 2

[0042] The present embodiment provides a method for separating and enriching lithium, comprising the following steps:

[0043] Pre-treatment: Dilute the above-mentioned Yantian old brine for the first time, and the dilution factor is 2.5 times. The first diluted Yantian old brine is first sent to a multimedia filter to remove some mechanical impurities such as silt, and then sent to an organic supernatant. Filtration system for complete removal of impurities, and then the second dilution, the dilution factor of the second dilution is 7.5 times, to obtain the pre-treated brine.

[0044] Separation: The pretreated brine is separated by a nanofiltration separation system to obtain nanofiltration fresh water and nanofiltration concentrated water, in which the concentration of lithium ions in the nanofiltration fresh water is 0.27g / L, and the concentration of magnesium ions is reduced to 0.11g / L , the mass ratio of magnesium ions to lithium ions is 0.42:1. specifically is:

[004...

Embodiment 3

[0054] The present embodiment provides a method for separating and enriching lithium, comprising the following steps:

[0055] Pre-treatment: Dilute the above-mentioned Yantian old brine for the first time, and the dilution factor is 2.5 times. The first diluted Yantian old brine is first sent to a multimedia filter to remove some mechanical impurities such as silt, and then sent to an organic supernatant. Filtration system for complete removal of impurities, and then the second dilution, the dilution factor of the second dilution is 7.5 times, to obtain the pre-treated brine.

[0056] Separation: The pretreated brine is separated through a nanofiltration separation system to obtain nanofiltration fresh water and nanofiltration concentrated water. The concentration of lithium ions in the nanofiltration fresh water is 0.80g / L, and the concentration of magnesium ions is reduced to 0.29g / L , the mass ratio of magnesium ions to lithium ions is 0.36:1. specifically is:

[0057] T...

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Abstract

The invention relates to the technical field of solution separation and purification, in particular to a method for separating and enriching lithium. The method comprises the following steps: pretreatment: diluting and filtering the old brine from Yantian to obtain pretreated brine; separation: separating the pretreated brine through a nanofiltration separation system to obtain nanofiltration fresh water and nanofiltration concentrated water; The first concentration: the nanofiltration fresh water is concentrated for the first time through the reverse osmosis system to obtain the reverse osmosis concentrate and the reverse osmosis fresh water; the second concentration: the reverse osmosis concentrate is concentrated for the second time through the electrodialysis system to obtain Electrodialysis concentrated water and electrodialysis fresh water, electrodialysis concentrated water is a solution rich in lithium ions. The present invention utilizes the advantages of different membrane separation technologies and couples several different membrane separation technologies to achieve the purpose of improving the separation efficiency of magnesium and lithium, and improving the efficiency of lithium enrichment, and the enriched lithium ions can achieve the preparation of high-purity The concentration of lithium ions required for lithium salts.

Description

technical field [0001] The invention belongs to the technical field of solution separation and purification, and in particular relates to a method for separating and enriching lithium. Background technique [0002] Lithium is a very important strategic resource. As the lightest metal element, lithium exists in two forms: solid ore and liquid ore in nature. my country is rich in lithium resource reserves, and the proven industrial reserves of lithium resources rank second in the world, of which 79% are brine lithium. It is estimated that Qinghai Salt Lake lithium reserves (calculated as lithium) are 1.5 million tons, ranking first in the country. Therefore, the technology of extracting lithium from salt lake brine has become the top priority of my country's competition for energy strategic highlands, and is a major strategic demand of the country. However, in terms of the composition characteristics of salt lake brine in my country, it is very difficult to extract lithium fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/00
CPCC01D15/00B01D2311/2512B01D61/029B01D61/422B01D61/58B01D61/027B01D2317/025B01D2317/022B01D61/025B01D61/44B01D61/04B01D61/145B01D2311/2649B01D2311/04C22B26/12B01D61/06B01D2311/06B01D2311/08
Inventor 王敏赵有璟李燕王怀有杨红军
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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