Process for extracting lithium from salt lake brine by adsorptive method

A technology of salt lake brine and adsorption method, applied in the field of lithium extraction, can solve the problems of low magnesium-lithium ratio, difficult separation of magnesium-lithium in brine, etc., and achieve the effects of simple preparation method, good environment and cost reduction.

Inactive Publication Date: 2004-07-14
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for extracting lithium from salt lake brine by adsorption method. The method is aimed at the natural polyhydric water-salt system with high magnesium-lithium ratio lithium-containing salt lake brine and concentrated lithium-containing old brine in salt fields, so as to solve the separation of magnesium and lithium in brine It is a difficult problem to provide qualified lithium-rich brine with low magnesium-lithium ratio for the production of lithium carbonate or lithium chloride

Method used

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Examples

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Effect test

example 1

[0029] 2M AlCl 3 The solution reacts with 5M NaOH solution (stoichiometric ratio) at room temperature to generate amorphous Al(OH) 3 Microcrystalline. Al(OH) 3 Microcrystals react with 6% LiCl solution (5 times excess) at 80°C with stirring for 2 hours, filter, wash and dry to generate LiCl 2Al(OH) 3 ·nH 2 O powder has a defect-type disordered structure and is amorphous by X-ray diffraction. Dissolve polyvinyl chloride in cyclohexanone, add LiCl 2Al(OH) 3 ·nH 2 O powder is adjusted into a paste, extruded and cut into shape on a granulator, ventilated and dried to remove solvent. The binder in the dry granules accounts for 7-10% (weight percentage) of the binder in the dry adsorbent granules, the mechanical strength is 99%, and the specific gravity is 1.2-1.5g / cm 3 , specific surface area 1.5~2.0m 2 / g, porosity 0.2~0.3cm 3 / g.

example 2

[0031] The brine used for adsorption contains about 2g / L LiCl, the total salt content is 300-500g / L, the solid-liquid phase contact time in the adsorption stage is 4.5-5.5 hours, the desorption liquid is desalted water containing 0.03g / L LiCl, and the residence time in the desorption stage is 3-5. 4 hours. Add a step of resaturation before desorption, use 2-2.5g / L LiCl solution without impurities to increase the adsorption capacity, and wash away the alkali metal and alkaline earth metal impurities on the adsorbent particles at the same time, and the resaturation time is 1.8-2.3 hours. The composition of the eluent was LiCl 3.0 g / L.

example 3

[0033] Brine composition (g / L): Li + 1.21, Na + 1.03,K + 0.67, Mg 2+ 118.29, B 2 o 3 1.60. After dilution, first use adsorbent to absorb lithium, rinse with pure water to obtain eluent, use cation exchange resin to remove magnesium and absorb lithium, use 10% NaCl to elute magnesium, use 6% NaCl to elute lithium, and use 1N for cation exchange resin HCl regeneration. The yield of lithium was 92%.

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Abstract

The present invention relates to adsorption process of extracting lithium from salt lake brine, and the process is suitable for producing lithium carbonate and lithium chloride with lithium-containing Qinghai saline lake brine, including concentrated lithium-containing Qinghai saline lake brine. The process includes sun shining saline lake brine to obtain concentrated lithium containing brine, adsorption of lithium ion with aluminum salt adsorbent, eluting adsorbed lithium ion with water, and refining and concentrating the elutriant to obtain material for preparing lithium carbonate and lithium chloride.

Description

technical field [0001] The invention relates to a technology for extracting lithium from a solution, especially a technology for extracting lithium from lithium-containing salt lake brine and salt field concentrated lithium-containing old brine by using an aluminum salt type adsorbent adsorption process; it is suitable for Qinghai lithium-containing salt lake brine and salt field concentration Lithium-containing old brine, and the production process of producing lithium carbonate or lithium chloride from Qinghai Salt Lake brine. Background technique [0002] Lithium ions coexist with a large amount of alkali metals and alkaline earth metals. To economically recover lithium from the natural multi-water salt system with high magnesium-lithium ratio salt lake brine depends not only on the concentration of lithium but also on the concentration of magnesium and calcium ions. Due to the similar chemical properties of magnesium and lithium, the separation of magnesium and lithium i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/24
CPCY02P10/20
Inventor 张绍成马培华邓小川
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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