A regeneration method for adsorbing impurities in zinc sulfate electrowinning waste liquid activated carbon

Abstract

The invention relates to a regeneration method for activated carbon after adsorption of impurities in a zinc sulfate electro-deposition waste liquid and belongs to the technical field of resource comprehensive utilization. The regeneration method includes the steps of: 1) firstly adding the activated carbon after adsorption of the impurities in the zinc sulfate electro-deposition waste liquid to an ethanol solution with uniform mixing to form a turbid liquid; 2) adding pyridine, uniformly stirring the liquid and performing a reaction in an ultrasonic generator; 3) adding a regeneration solvent I, stirring the liquid uniformly and performing an ultrasonic reaction, performing vacuum filtration, and recycling the regeneration solvent I from a filtrate and drying a filer residue solid to obtain activated carbon; 4) dissolving the activated carbon in a regeneration solvent II, performing ultrasonic impregnation, and performing vacuum filtration to obtain an impregnated solid substance; and 5) heating the impregnated solid substance in microwave with CO2 being fed, cooling the heated substance and washing the heated substance with distilled water, and recycling the regeneration solvent II from the washing water and drying the washed heated substance to obtain the regenerated activated carbon. The method is carried out according to the principle of like dissolves like and the principle of different melting points of different impurities and is used for regenerating the activated carbon after the adsorption of organic and inorganic impurities in a two-stage regeneration manner.

Description

technical field [0001] The invention relates to a regeneration method for activated carbon that absorbs impurities in zinc sulfate electrowinning waste liquid, and belongs to the technical field of comprehensive utilization of resources. Background technique [0002] As a porous material with excellent performance, activated carbon is widely used in many industrial fields, such as gas / liquid phase separation / purification, wastewater treatment, catalyst carrier, supercapacitor, energy storage, etc. With the development of human society, the application range of activated carbon is becoming wider and wider, and the demand is also increasing. All walks of life use the advantages of activated carbon such as porosity, strong adsorption, and high strength to purify various impurities, but the activated carbon after the impurities have been treated loses its activity, and various polluting impurities remain in the activated carbon to form a potential Hidden danger. [0003] Usual...

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Problems solved by technology

Compared with the present invention, above-mentioned invention, one is that above-mentioned method simply uses regenerated solvent, and described range is too wide, and waste activated carbon has great regeneration difference according to the impurity type that adsorbs is different, for containing organic impurity and inorganic impurity at the same time Waste activated carbon, the above-mentioned invention is obviously powerless, because the organic macromolecules are insoluble in water, and despite the assistance of ultrasonic waves, the regeneration is not complete

The second is that the above invention does not decompose at a higher temperature during the entire regeneration process, because the desorption effect of the airflow is far better than that of the water solvent, and the dissolution process does not follow the principle of similar compatibility, so that some organic matter remains and the regeneration is not complete

Compared with the present invention, the above-mentioned invention: the method is too simplistic, and the Fenton reagent has the ability to oxidize organic matter, but the content of organic matter in the waste activated carbon is low and dispersed, and effective enrichment cannot be carried out, so the oxidation is not complete

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