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Method for recovering zinc from acid pickling waste liquid by using solvent extraction

A technology of pickling waste liquid and extraction, which is applied in the field of zinc recovery, can solve the problems of increased difficulty in zinc recovery and utilization, and achieve the effects of low operating cost, simple process, and low equipment investment

Inactive Publication Date: 2019-01-25
桐乡市思远环保科技有限公司
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Problems solved by technology

[0002] The pickling waste liquid containing zinc and iron ions is very corrosive, and the common zinc recovery process is only suitable for the recovery of zinc in low-concentration zinc-containing pickling waste liquid, and when the zinc content in the pickling waste liquid is high , the difficulty of zinc recycling increases sharply

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  • Method for recovering zinc from acid pickling waste liquid by using solvent extraction

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Embodiment Construction

[0027] A kind of method adopting solvent extraction to reclaim zinc from pickling waste liquid, described step comprises:

[0028] a) Reduce the pickling waste liquid containing zinc and iron ions through iron powder, reduce the ferric iron in the pickling waste liquid to ferrous iron, and use hydrochloric acid to control the acidity of the pickling waste liquid, and the pickling waste liquid The pH is controlled at less than 1.0.

[0029] b) Filtrating the pickling waste liquid obtained in step a) to obtain the pre-zinc extraction liquid.

[0030] c) Mix and extract the pre-zinc extraction solution obtained in step b) with the extractant. The extractant is a neutral extractant. The extraction temperature is 20-50 degrees, the shaking time is 1-10 minutes, and the load is obtained by standing and stratifying. Organic as well as raffinate of zinc chloride. In this embodiment, the zinc content of the obtained raffinate is less than 0.5g / L, and the resin method can be used to c...

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Abstract

The invention discloses a method for recovering zinc from acid pickling waste liquid by using solvent extraction, and solves a current problem that a high-quality zinc product cannot be obtained fromhigh-concentration acidic waste liquid containing zinc and iron ions. The method comprises the following steps: firstly reducing the acidic waste liquid containing the zinc and iron ions through ironpowder, and reducing ferric iron in solution; after reduction, filtering the acid pickling waste liquid, to obtain zinc extraction pre-liquid; extracting the zinc extraction pre-liquid, to obtain organic raffinate loaded with zinc chloride; performing impurity washing on the loaded organic, to obtain post-washing organic and post-washing water; performing reverse extraction on the post-washing organic, to obtain regenerated organic and zinc reverse extraction rich solution; deoiling the zinc reverse extraction rich solution, and entering a pH adjusting tank, to obtain a zinc dichlorodiammoniaprecipitate in a section of the pH adjusting tank; filtering, drying, and calcining the zinc dichlorodiammonia precipitate, to obtain high-purity anhydrous zinc chloride, and recovering ammonia. The method is capable of acquiring a high-quality anhydrous zinc chloride product from the acidic waste liquid containing the zinc and iron ions.

Description

technical field [0001] The invention relates to a method for recovering zinc, in particular to a method for recovering zinc from pickling waste liquid by solvent extraction. Background technique [0002] The pickling waste liquid containing zinc and iron ions is very corrosive, and the common zinc recovery process is only suitable for the recovery of zinc in low-concentration zinc-containing pickling waste liquid, and when the zinc content in the pickling waste liquid is high , the difficulty of zinc recycling increases sharply. Therefore, it is of great practical significance to recover zinc from pickling wastewater with high zinc content and realize the recovery and utilization of zinc secondary resources. [0003] At present, the commonly used methods for treating zinc-containing pickling waste produced by the hot-dip galvanizing industry at home and abroad include neutralization precipitation method, acid steaming method, flotation method, ferrite method, ion exchange m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B19/30
CPCC22B7/006C22B19/30Y02P10/20
Inventor 蒋航宇盛祖贵刘宇豪蒋雅竹
Owner 桐乡市思远环保科技有限公司
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