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Method for preparing lithium chloride concentrate by using eluent of adsorptive lithium extraction as raw material

A technology of eluent and concentrate, applied in chemical instruments and methods, lithium halide, lithium carbonate;/acid carbonate, etc., can solve the problem of reducing the impurity content of the eluent for adsorption and extraction of lithium and affecting the adsorption method Problems such as the promotion and application of lithium extraction and low production efficiency can achieve the effects of reducing production costs, avoiding high acid-base and water consumption, and saving investment

Active Publication Date: 2017-03-15
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the patent only limits the stock solution to salt lake brine with a magnesium-lithium ratio of 1 to 300 and the concentrated brine obtained by evaporation; when the lithium content in the stock solution is lower than 0.1M, in order to avoid concentration polarization, the equipment can only be used at low load Lower operation, resulting in low production efficiency and high equipment investment
[0007] In short, the existing technology cannot continuously and stably realize the separation of magnesium and lithium and the concentration of lithium at a low investment cost. While removing a large amount of magnesium, it can concentrate lithium to more than 10g / L or higher, and at the same time significantly reduce the adsorption and extraction of lithium. Content of impurities such as sulfate and borate in the eluent
Therefore, the problem of magnesium removal and concentration of the lithium extraction eluent is the bottleneck problem that limits the full load and stable production of the adsorption method, and even affects the popularization and application of the adsorption method for lithium extraction.

Method used

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  • Method for preparing lithium chloride concentrate by using eluent of adsorptive lithium extraction as raw material
  • Method for preparing lithium chloride concentrate by using eluent of adsorptive lithium extraction as raw material
  • Method for preparing lithium chloride concentrate by using eluent of adsorptive lithium extraction as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Pretreatment eluent:

[0038] An eluent for adsorption and extraction of lithium contains 495 mg / L lithium and 1931 mg / L magnesium, which are used as raw materials for treatment. After the raw material is vacuum filtered, its solid suspended matter content is less than 5 mg / L, and its pH value is adjusted to 6.0 to become the eluent after pretreatment.

[0039] Reverse osmosis pre-concentration:

[0040] Take 1000L of pretreated eluate and treat it with a reverse osmosis device equipped with Dow Chemical FILMTEC SW30-2540 membrane elements to obtain 820L of reverse osmosis fresh water and 180L of lithium containing 1700-7000mg / L reverse osmosis concentrated water.

[0041] Magnesium removal and concentration by electrodialysis:

[0042] Use an electrodialyzer consisting of 9 pairs of CIMS positive membranes and ACS negative membranes alternately arranged for treatment, with a total effective membrane area of ​​0.16m 2 . Concentrated reverse osmosis water is used as de...

Embodiment 2

[0047] An eluent for adsorption and extraction of lithium, containing 151mg / L lithium and 1200mg / L magnesium, after vacuum filtration, its solid suspended matter content is less than 5mg / L, and its pH value is adjusted to 4.0 to form a pretreated eluent .

[0048] Take 1000L of the eluate after the pretreatment, and use a reverse osmosis device equipped with Dow Chemical FILMTEC SW30-2540 membrane elements to obtain 920L of reverse osmosis fresh water and 80L of reverse osmosis concentrated water.

[0049] Using the same electrodialyzer as in Example 1, only the membranes therein were replaced with K192 positive membrane and ASV negative membrane. Concentrated reverse osmosis water is used as desalination stock solution, 0.8L deionized water is used as concentrated solution feed water, the volume ratio of the two is 100, and 0.5mol / L NaNO is used as electrode circulating fluid 3 solution, at 160A / m 2 The constant current operation was carried out with the electric current, t...

Embodiment 3

[0054] An eluent for adsorption and extraction of lithium, containing 2490mg / L lithium and 1370mg / L magnesium, after vacuum filtration, its solid suspended matter content is less than 5mg / L, and its pH value is adjusted to 6.0 to become the eluent after pretreatment .

[0055] Take 1000L of pretreated eluate and treat it with a reverse osmosis device equipped with Dow Chemical FILMTEC SW30-2540 membrane elements to obtain 615L of reverse osmosis fresh water and 385L of reverse osmosis concentrated water.

[0056] Use an electrodialyzer consisting of 50 pairs of CSV positive membranes and A192 negative membranes alternately arranged, with a total effective membrane area of ​​5m 2 . Concentrated reverse osmosis water is used as desalination stock solution, 8L deionized water is used as concentrated solution feed water, the volume ratio of the two is 48, and 0.5mol / L NaNO is used as the electrode circulating fluid 3 solution, at 550A / m 2 The constant current operation was carr...

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Abstract

The invention relates to a method for preparing lithium chloride concentrate by using eluent of adsorptive lithium extraction as raw material; adsorptive lithium extraction eluent having magnesium-lithium ratio of 0.5-10 and lithium content of 150-2500 mg / L is used as a raw liquid, the raw liquid is subjected to reverse osmosis, pre-concentration is then carried out to obtain lithium content of 1700-7000 mg / L, reverse osmosis concentrate is used as electrodialysis desalination stock liquid, the stock liquid is treated with a monovalent ion selective exchange membrane to obtain lithium chloride concentrate having lithium content of 14 g / L and magnesium-lithium ratio of 0.1-1 and suitable for high-purity lithium salts, such as lithium carbonate and lithium chloride; reverse osmosis fresh water is reclaimed for cyclic use in the desorption step of adsorptive lithium extraction; electrodialysis desalination produced water is returned for cyclic use in the adsorbing step, and therefore concentrative enrichment of lithium in eluent and full reclaiming of water are achieved. The method is simple to perform, has a continuous process and is low in investment and low in cost, and the bottleneck problem with magnesium removal and concentration of salt lake adsorptive lithium extraction eluent with high magnesium-lithium ratio is basically solved.

Description

technical field [0001] The invention relates to the field of separation and purification of rare metal inorganic salt solutions, in particular to a method for concentrating and enriching lithium in feed liquid in the process of adsorption and extraction of lithium by adopting membrane separation technology. Background technique [0002] New energy metal lithium is an important strategic resource for human beings in the new era. The demand for basic lithium salt products such as lithium carbonate, lithium chloride, and lithium hydroxide is growing rapidly at home and abroad. Lithium mainly exists in nature in two forms of solid ore and liquid ore, of which the amount of lithium resources in brine accounts for about 2 / 3, and lithium extraction from brine is the main source of the global lithium market. The economical extraction of lithium from this type of system depends not only on the concentration of lithium, but also on the content of magnesium and calcium ions. At the sam...

Claims

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Application Information

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IPC IPC(8): B01D61/58C01D15/04C01D15/08B01D61/02B01D61/44
CPCB01D61/025B01D61/445B01D61/58C01D15/04C01D15/08Y02A20/124Y02A20/131
Inventor 温现明朱朝梁邓小川邵斐史一飞卿彬菊樊发英唐志雷
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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