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

Active Publication Date: 2015-09-16
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a method for extracting zinc from a low-concentration zinc sulfate solution, which solves the problems of complicated process and high energy consumption in production in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a method for extracting zinc from a low-concentration zinc sulfate solution, belonging to the technical field of wet-process metallurgy. The method is characterized in that a low-concentration ZnSO4 solution is used as an aqueous phase, an extracting agent and a diluting agent jointly serve as oil phases, the aqueous phase and the oil phases are synchronously pumped into a micro-fluid passage with the diameter of 25-600 micrometers according to a volume ratio of (1:5)-(1:1) and are subjected to extraction reaction, after the reaction is ended, effluent mixed liquid stands still and is subjected to phase separation, and at the moment, Zn<2+> enters a loaded organic phase, so that the extraction separation of zinc in the low-concentration ZnSO4 solution is realized. According to the method, micro-fluid of a continuous flow enhanced mixed-type passage structure is used for zinc extraction, the reaction time is reduced to the millisecond-stage range, the single-stage zinc extraction efficiency is obviously improved, and the extraction stage number is reduced.

Description

technical field [0001] The invention relates to a method for extracting zinc from a low-concentration zinc sulfate solution, belonging to the technical field of hydrometallurgy. Background technique [0002] Zinc has a wide range of uses, and has shown good market demand and market price. Zinc metallurgy in my country has developed rapidly. However, due to the limited resources of zinc metallurgy, in order to maintain the sustainable and healthy development of zinc metallurgy, it is necessary to develop and utilize various zinc raw materials. There are abundant low-grade zinc oxide ore resources in my country. At present, direct acid leaching is the process for extracting zinc from low-grade zinc oxide ore and industrializing it. This process has an important problem - a large amount of slag is produced, and the slag generally contains 4-6% soluble zinc (mainly zinc sulfate in the leachate taken away by the slag). This not only reduces the recovery rate of zinc, but also c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/40C22B19/00
CPCY02P10/20
Inventor 彭金辉简坚夏洪应张利波张利华
Owner KUNMING UNIV OF SCI & TECH
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