Method for extracting lithium from salt lake brine by extraction method

A technology for extracting lithium from salt lake brine is applied in the field of lithium extraction, which can solve the problems affecting the extraction ability of regenerative organic phase lithium, high requirements for anti-corrosion of extraction equipment, and high overall production cost, and achieves water solubility and chemical degradation. Application, the effect of reducing the cost of the extraction process

Active Publication Date: 2017-05-10
JIANGXI HZONE LITHIUM TECH
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Problems solved by technology

The phase-inversion regeneration process of the organic phase of the extraction system is to shake the empty organic phase after hydrochloric acid back-extraction with quantitative sodium hydroxide, neutralize the acid in the organic phase, and then contact the raffinate to extract iron into the water phase. into the organic phase to make HFeCl 4 Converted to NaFeCl 4 , Mg(FeCl4) 2 , so that the extraction agent recovers the ability to extract lithium to complete the phase inversion process. During the phase inversion process, the amount of alkali added must be precisely controlled. If the amount of alkali added i

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  • Method for extracting lithium from salt lake brine by extraction method

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Embodiment 1

[0029]The neutral phosphorus oxygen compound A is tributyl phosphate TBP, the phase regulator B is the amine compound triisooctylamine N235 and the high-carbon alcohol compound sec-octanol, the diluent is sulfonated kerosene to form the extraction agent, tributyl phosphate The ester TBP accounts for 10%-40% by volume in the extractant.

[0030] Shake 1 part of extractant and 1 part of 0.1-6 mol / l hydrochloric acid solution with ferric chloride concentration of 0.1-3 mol / l for 10 minutes, then stand still for phase separation to obtain a loaded organic phase loaded with iron and acid; mix 1 part of the above-mentioned loaded Shake the organic phase with 4 parts of 3-6 mol / l calcium chloride solution for 10 minutes, then stand still and separate the phases to complete the transformation of the loaded organic phase; Lithium-containing brine (Mg / Li=100:1 mass ratio) was shaken for 10 minutes for extraction. After shaking, the phases were separated and the organic phase and aqueous...

Embodiment 2

[0032] Neutral phosphorus oxygen compound A uses trioctyl phosphate TOP, phase regulator B uses amine compound primary amine N1923 and higher carbon alcohol compound n-heptanol, diluent uses sulfonated kerosene to form extraction agent, trioctyl phosphate TOP It accounts for 10%-40% by volume in the extractant.

[0033] Shaking 1 part of extractant with 1 part of saturated magnesium chloride solution with ferric chloride concentration of 0.1 to 1 mol / l and hydrochloric acid concentration of 0.1 to 1 mol / l for 10 minutes and then standing for phase separation to obtain a loaded organic phase loaded with iron and acid; 1 part of the above-mentioned loaded organic phase and 6 parts of 3-6 mol / l magnesium chloride solution were shaken for 10 minutes and then left to separate the phases to complete the transformation of the loaded organic phase; Lithium-containing brine (Mg / Li=50:1 mass ratio) in a salt lake was shaken for 10 minutes for extraction. + , Mg 2+ 、Na + and K + Conc...

Embodiment 3

[0035] Neutral phosphorus and oxygen compound A uses tributyl phosphate TBP, phase regulator B uses amine compound primary amine N1923 and higher carbon alcohol compound secondary octanol, diluent uses sulfonated kerosene to form the extractant, tributyl phosphate TBP It accounts for 10%-40% by volume in the extractant.

[0036] Shaking 1 part of extractant with 1 part of saturated magnesium chloride solution with ferric chloride concentration of 0.1 to 1 mol / l and hydrochloric acid concentration of 0.1 to 1 mol / l for 10 minutes and then standing for phase separation to obtain a loaded organic phase loaded with iron and acid; 1 part of the above-mentioned loaded organic phase and 6 parts of 3-6 mol / l magnesium chloride solution were shaken for 10 minutes and then left to separate the phases to complete the transformation of the loaded organic phase; Lithium-containing brine (Mg / Li=50:1 mass ratio) in a salt lake was subjected to three-stage countercurrent extraction, and the o...

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Abstract

The invention relates to a method for extracting lithium from salt lake brine by an extraction method. The method is suitable for a production process that lithium carbonate and lithium chloride are prepared from high magnesium-lithium ratio salt lake brine and concentrated old brine which contains lithium of salt pan. Co-extraction agent FeCl3, extraction agent and diluent are adopted to carry out lithium extraction, wherein the extraction agent is mixture of neutral phosphorus oxide compound A and phase modifier B, the phase modifier B is organic compound which can generate protonation reaction with the neutral phosphorus oxide compound A in an extraction reaction process, an extraction complex composition obtained after the extraction agent is used for lithium extraction is xLiFeCl4.yHCl.aA.bB, and the extraction complex can be easily dissolved in diluent; an extraction system has good phase splitting performance and reverse extraction and regeneration performance, and the lithium extraction technology of the extraction method is further optimized. The method has a low requirement on equipment, the adopted organic compound is cheap and can be easily obtained, and therefore, the method is suitable for industrial application.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for extracting lithium from salt lake brine by an extraction method. Background technique [0002] Lithium has various excellent properties, and is known as "the energy metal of the 21st century", "industrial monosodium glutamate", "tomorrow's aerospace alloy", and has a significant strategic position. Salt lake brine is an important resource of lithium. my country has abundant lithium resources of salt lake brine, and its reserves rank among the top in the world. Lithium extraction from brine produced abroad is limited to brine with low magnesium concentration, and the ratio of magnesium to lithium is less than 6:1. For the so-called "high-magnesium-lithium" salt lakes containing high-concentration magnesium and low-concentration lithium, such as my country's Qaidam Basin salt lake Separation and extraction of lithium from brine is a recognized worldwide techn...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B3/40
CPCC02F2103/007C22B26/12C22B3/409Y02P10/20
Inventor 郭永兴欧阳红勇王迎春曾小毛刘金练樊磊祝宏帅
Owner JIANGXI HZONE LITHIUM TECH
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