Stripping method for lithium extraction liquid
An extraction liquid and extraction technology, which is applied in the field of lithium extraction, can solve the problems of potential safety hazards, high equipment costs, and high production costs, and achieve the effects of low maintenance costs, high safety, and low production costs
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Embodiment 1
[0059] 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.
[0060] 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.
[0061] The aqueous solution of lithium bicarbonate colle...
Embodiment 2
[0064] 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.
[0065] 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.
[0066] The aqueous solution of l...
Embodiment 3
[0069] First take 75mL of benzoyltrifluorodecanone, 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, without adjustment 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.
[0070] 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.
[0071] The aqueous solution of li...
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