Method for extracting lithium from salt lake brine

A salt lake brine and extraction technology, applied in the field of lithium extraction, can solve the problems of potential safety hazards, large temperature difference changes, and high equipment costs, and achieve the effects of avoiding acid corrosion, low production costs, and high safety

Active Publication Date: 2021-02-09
ZHEJIANG XINHUA CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing solvent extraction method still has the following problems: (1) strong acid solutions such as hydrochloric acid and sulfuric acid are mainly used for back extraction, and the production cost is high; (2) the strong acid solution used for back extraction will make the back extraction process, And the stripping raffinate obtained after stripping is acidic, and the equipment of metal materials such as stainless steel is severely corroded, which not only has potential safety hazards, but also has high equipment costs
In addition, because salt lakes are generally distributed in plateau areas, the temperature difference varies greatly. If equipment made of engineering plastics is used to avoid acid corrosion, there will also be safety hazards under the effect of long-term thermal expansion and contraction

Method used

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  • Method for extracting lithium from salt lake brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] First take 20mL of benzoyltrifluoroacetone, 20mL of tris(2-ethylhexyl) phosphate, and 60mL of kerosene in a separatory funnel and mix them evenly to obtain the extract, then add alkaline salt lake brine containing 0.26g / L lithium 300mL, no need to adjust the pH value of the brine, shake and extract for 5 minutes, separate the aqueous phase and the loaded extract, extract three times, and combine the loaded extract. Wherein, the pH of the loading extract is 9.

[0073] Mix carbon dioxide and pure water with the above-mentioned loaded extract, and back-extract three times. The single back-extraction time is 5 minutes. The temperature when carbon dioxide is introduced is 25°C, and the pressure is 0.1MPa. It is 1:3. The aqueous phase is collected to obtain the lithium bicarbonate-containing back raffinate, the pH of the back raffinate is 9, and the empty extract is recycled to the extraction stage for further use.

[0074] The aqueous solution of lithium bicarbonate colle...

Embodiment 2

[0077] Take 5mL of benzoyltrifluoroacetone, 5mL of trihexyl phosphate, and 15mL of kerosene in a separating funnel and mix them evenly to obtain the extract, then add 100mL of alkaline salt lake brine containing 2.2g / L lithium, without adjusting the pH of the brine The value was 11, and the aqueous phase and the loaded extract were separated after 10 minutes of shaking extraction, extracted three times, and the loaded extract was combined. Wherein, the pH of the loading extract is 11.

[0078] Mix carbon dioxide and pure water with the above-mentioned loaded extract, and back-extract three times. The single back-extraction time is 5 minutes. The temperature when carbon dioxide is introduced is 20°C, and the pressure is 0.15MPa. It is 1:2. The aqueous phase is collected to obtain the lithium bicarbonate-containing back raffinate, the pH of the back raffinate is 10, and the unloaded extract is recycled to the extraction stage for further use.

[0079] The aqueous solution of l...

Embodiment 3

[0082] Take 75mL of benzoyl trifluorodecanone, 75mL of tripentyl phosphate, and 200mL of kerosene in a separatory funnel and mix them evenly to obtain the extract, then add 700mL of alkaline salt lake brine containing 1.5g / L lithium, no need to adjust The pH value of the brine was shaken and extracted for 10 minutes, and the aqueous phase and the loaded extract were separated, extracted three times, and the loaded extract was combined. Wherein, the pH of the loading extract is 10.

[0083]Mix carbon dioxide and pure water with the above-mentioned loaded extract, and back-extract three times. The single-time back-extraction time is 6 minutes. The temperature when carbon dioxide is introduced is 30°C and the pressure is 0.2MPa. 1:1. The aqueous phase is collected to obtain the lithium bicarbonate-containing back raffinate, the pH of the back raffinate is 10, and the unloaded extract is recycled to the extraction stage for further use.

[0084] The aqueous solution of lithium b...

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Abstract

The invention relates to a method for extracting lithium from salt lake brine. The method comprises the following steps that (1) the salt lake brine is provided; (2) the salt lake brine is mixed withan extracting solution, and extracting is carried out to obtain a loaded extraction liquid; (3) the loaded extraction liquid is mixed with a stripping liquid, and stripping is carried out to obtain stripping raffinate containing lithium bicarbonate, wherein the pH value of the stripping raffinate is 7-11, and the pH value of the stripping raffinate is less than or equal to the pH value of the loaded extraction liquid; and (4) the stripping raffinate is heated, and separating is carried out to obtain lithium carbonate. The method can avoid acidic corrosion of equipment and is high in safety, and the obtained lithium carbonate is high in purity and low in cost.

Description

technical field [0001] The invention relates to the technical field of lithium extraction, in particular to a method for extracting lithium from salt lake brine. Background technique [0002] At present, the methods for extracting lithium from salt lake brine mainly include precipitation method, solvent extraction method and adsorption method. Among them, the solvent extraction method is a very popular new technology for extracting lithium from salt lake brine at home and abroad. It uses the special extraction performance of organic solvents to achieve the purpose of extracting lithium. However, the existing solvent extraction method still has the following problems: (1) strong acid solutions such as hydrochloric acid and sulfuric acid are mainly used for back extraction, and the production cost is high; (2) the strong acid solution used for back extraction will make the back extraction process, And the strip raffinate obtained after stripping is all acidic, and the equipme...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B3/26C01D15/08
CPCC22B26/12C01D15/08C22B3/26Y02P10/20
Inventor 胡健应思斌阿锡他刘震王卫明邵卫平朱玉成严新华王昶王俊王晓明
Owner ZHEJIANG XINHUA CHEM
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