A method for extracting zinc from low-concentration zinc sulfate solution
A zinc sulfate solution and low-concentration technology, applied in the field of hydrometallurgy, can solve the problems of high production energy consumption and complex process, and achieve the effects of expanding production capacity, high mixing efficiency, and reducing the number of extraction stages
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Embodiment approach 1
[0024] Embodiment one: the method for extracting zinc from the low-concentration zinc sulfate solution of this embodiment is: Zn 2+ ZnSO with mass concentration of 15g / L 4 The solution is used as the water phase, 2-ethylhexyl phosphoric acid and 260# solvent oil are used together as the oil phase (the volume fraction of 2-ethylhexyl phosphoric acid in the oil phase is controlled at 20%), and the water phase and the oil phase are in a volume ratio of 1:1 Synchronously pumped into a microfluidic channel with a diameter of 300μm for extraction reaction, the reaction time is 540ms, the mixed liquid flowing out after the reaction is shaken and reacted for 1min, and then left to separate phases for 5min, the single-stage extraction rate reaches 92.04%, and it passes through 3-stage countercurrent The extraction can make the residual amount of zinc in the raffinate be 0.1%, that is, 99.9% of the zinc is extracted into the organic phase. At this time Zn 2+ Into the loaded organic ph...
Embodiment approach 2
[0025] Embodiment two: the method for extracting zinc from the low-concentration zinc sulfate solution of this embodiment is: Zn 2+ ZnSO with mass concentration of 5g / L 4 The solution is used as the water phase, 2-ethylhexyl phosphoric acid and 260# solvent oil are used together as the oil phase (the volume fraction of 2-ethylhexyl phosphoric acid in the oil phase is controlled at 5%), and the water phase and the oil phase are in a volume ratio of 1:3 Simultaneously pumped into a microfluidic channel with a diameter of 25 μm for extraction reaction, the reaction time is 600 ms, the mixed liquid flowing out after the reaction is shaken for 5 minutes, and then left to stand for 0.5 minutes to separate the phases, and the Zn obtained by single-stage extraction is separated 2+ The extraction rate is 81.44%. It is necessary to pass 5 stages of countercurrent extraction so that the residual zinc in the raffinate is 0.1%, that is, 99.9% of the zinc is extracted into the organic phas...
Embodiment approach 3
[0026] Embodiment three: the method for extracting zinc from the low-concentration zinc sulfate solution of this embodiment is: Zn 2+ ZnSO with mass concentration of 25g / L 4 The solution is used as the water phase, 2-ethylhexyl phosphoric acid and 260# solvent oil are used together as the oil phase (the volume fraction of 2-ethylhexyl phosphoric acid in the oil phase is controlled at 40%), and the water phase and the oil phase are in a volume ratio of 1:5 Simultaneously pumped into a microfluidic channel with a diameter of 600 μm for extraction reaction, the reaction time was 100 ms, the mixed liquid flowing out after the reaction was shaken and reacted for 4 minutes, and then stood still for 20 minutes to separate phases, at this time Zn 2+ Into the loaded organic phase (oil phase), that is, to achieve a low concentration of ZnSO 4 Extraction and separation of zinc in solution.
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