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Method for extracting lithium from lithium-containing solution by solvent extraction

A lithium solution and a technology for extracting lithium, which is applied in the fields of chemical industry and extraction chemistry, can solve the problems of large reagent consumption, high recovery cost, and difficulty in lithium recovery, and achieve good results, reduce energy consumption and reagent consumption, and reduce production costs. Effect

Pending Publication Date: 2020-04-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0005] For the impurities containing lithium and monovalent metal ions such as sodium and potassium obtained after deep impurity removal in the production process of lithium carbonate, as well as the raffinate containing lithium, sodium and potassium after lithium carbonate precipitation, it is difficult to recover lithium, the recovery cost is high, and the recovery The outstanding problems of low efficiency, large reagent consumption and heavy pollution, the invention provides a method for extracting lithium by solvent extraction from a solution containing impurities such as lithium and sodium and potassium

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Decomposition and leaching of spodumene with sulfuric acid, initial impurity removal of lime milk, deep removal of calcium and magnesium with sodium hydroxide to obtain an immersion solution containing 3.5g / L lithium, the solution contains impurity ions sodium 41g / L, potassium 0.5g / L, calcium 120mg / L, magnesium 58mg / L and other trace elements, the cation exchange resin further removes calcium and magnesium, the calcium concentration is reduced to 3.0mg / L, and the magnesium concentration is reduced to 5.3mg / L. Use 20% NaOH solution to adjust the pH to 12.2, and then use 0.4mol / L LIX 54+0.2mol / LCyanex 923 to form a synergistic extraction system, kerosene as the diluent, at room temperature (25°C) in a mixing and settling tank with 5 stages of countercurrent continuous For extraction, the pH of each stage is adjusted to 12 with NaOH, compared to (volume of organic phase to volume of aqueous phase) 3:1, the extraction rate of lithium is 98.5%. The organic phase was extracte...

Embodiment 2

[0015] Decomposition and leaching of spodumene with sulfuric acid, initial impurity removal of lime milk, deep removal of calcium and magnesium with sodium hydroxide to obtain an immersion solution containing 3.5g / L lithium, the solution contains impurity ions sodium 41g / L, potassium 0.5g / L, calcium 120mg / L, magnesium 58mg / L and other trace elements, the solution pH is 12.2. A synergistic extraction system consisting of 2.0mol / L LIX 54+0.2mol / L Cyanex 923, kerosene as the diluent, 5-stage countercurrent continuous extraction in a mixing and settling tank at room temperature (25°C), adjusting the pH of each stage to 12 with NaOH , Compared with (volume of organic phase to volume of aqueous phase) 1:1, the extraction rate of lithium is 97.8%. Extract the organic phase at a pH of 10.5, use 0.1mol / L dilute sulfuric acid as the detergent, and wash continuously in 3 stages of countercurrent compared to 50:1, and then wash with 3.8mol / L H 2 SO 4 As a stripping agent, compared with ...

Embodiment 3

[0017] A kind of old brine after potassium extraction in salt lake, remove a large amount of calcium and magnesium through nanofiltration membrane, then use sodium hydroxide to remove calcium and magnesium deeply to obtain a dilute brine solution containing 0.8g / L lithium, and the solution contains 6g / L impurity ion sodium , Potassium 0.2g / L, Calcium 40mg / L, Magnesium 100mg / L and other trace elements, the pH of the solution is 11.5, through the cation exchange column to further remove calcium and magnesium, the concentration of calcium in the solution is reduced to 3mg / L, and the concentration of magnesium is reduced to 5mg / L. A synergistic extraction system consisting of 0.2mol / L LIX 54+2mol / L Cyanex 923, kerosene as the diluent, 3-stage countercurrent continuous extraction in a mixing and settling tank at room temperature (25°C), adjusting the pH of each stage to 11.8 with NaOH, Compared with (volume of organic phase to volume of aqueous phase) 2:1, the extraction rate of li...

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Abstract

The invention provides a method for extracting lithium from a lithium-containing solution by solvent extraction. The method comprises the following steps: (1) adjusting the pH value of the lithium-containing solution to 11-14; (2) mixing the adjusted solution with a synergistic extraction system to extract lithium; (3) washing an extracted organic phase; and (4) carrying out organic phase reverseextraction on loaded lithium by adopting a reverse extraction solution to obtain a high-purity lithium reverse extraction solution. The method can be used for preparing battery-grade lithium carbonatein one step at low cost, and can also be used for preparing high-purity lithium chloride, lithium sulfate and lithium hydroxide products. The method is low in energy consumption, short in process, high in yield and less in pollutant emission. The method can also be used for efficiently recovering lithium from a lithium-containing residual liquid after lithium carbonate precipitation.

Description

technical field [0001] The invention relates to the technical fields of extraction chemistry and chemical industry, in particular to a method for extracting and purifying lithium from a lithium-containing solution. Background technique [0002] Lithium is an important raw material for secondary clean energy. The wide application of lithium-ion batteries has promoted the rapid growth of lithium demand. In recent years, lithium consumption has increased at a rate of more than 10%. The lithium extraction production process requires multiple purification steps. In the classic process, pH control is often used to selectively remove impurities, and after deep removal of calcium and magnesium ions, a lithium-containing solution is obtained. The solution also contains a large amount of low-priced metals such as sodium or potassium. Impurities. After the solution is concentrated, sodium carbonate is often used to precipitate at 80°C to obtain lithium carbonate product. Due to the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/40C22B7/00C22B26/12
CPCC22B7/006C22B26/12C22B3/409Y02P10/20
Inventor 朱兆武张健王丽娜齐涛
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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