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Process for enriching copper and nickel in electroplating copper-nickel mixed waste water

A technology for mixing wastewater and electroplating copper, applied in the electrolysis process, electrolysis components, cells, etc., can solve the problems of narrow application of ion exchange method, reduced resin processing capacity, environmental protection pressure, etc., to improve regeneration rate and ion exchange treatment. ability, prevention of resin contamination and poisoning, and the effect of reducing operating costs

Inactive Publication Date: 2012-09-26
HUZHOU JINTAI PLATING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These wastewaters contain harmful substances such as heavy metal ions, organic compounds and other inorganic compounds, which have caused great pressure on environmental protection and need to be resolved urgently.
At present, the single cleaning water containing copper or nickel produced in electroplating production can be recovered through the tank side recovery device, but the collection rate is low, less than 30%
However, the membrane separation method has high energy consumption, large investment, and strict requirements on the water quality of the membrane feed. It is only suitable for a single cleaning water on the production line and has high requirements for pretreatment.
The ion exchange method is applicable to a narrow range. For the electroplating copper-nickel mixed wastewater containing a large amount of iron ions and oily substances, it is difficult to pollute the resin after the iron ions and oily substances come into contact with the resin, which reduces the processing capacity of the resin and even poisons it. regeneration, thus limiting its application in the treatment of electroplated copper-nickel mixed wastewater

Method used

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  • Process for enriching copper and nickel in electroplating copper-nickel mixed waste water

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Embodiment 1

[0022] A process for enriching copper-nickel from electroplating copper-nickel mixed wastewater, comprising the following steps:

[0023] ①Pretreatment: Adjust the pH value of the electroplating copper-nickel mixed wastewater to 4 in the neutralization tank, and then discharge it into the sedimentation tank to make Fe(OH) 3 Sedimentation and separation of flocs and solid impurities, removal of soluble oil and particulate impurities, and finally control of the oxidation-reduction potential of the wastewater to ≤30mV;

[0024] ② Ion exchange adsorption: The wastewater after the above pretreatment enters the ion exchange device, and the ion exchange resin absorbs and enriches copper and nickel until it is saturated;

[0025] ③ Ion exchange regeneration: connect the regeneration tank and ion exchange device, first use hydrochloric acid to regenerate and recover copper and nickel, and then use complexing agent citric acid and ethanol to regenerate and restore resin activity.

Embodiment 2

[0027] A process for enriching copper-nickel from electroplating copper-nickel mixed wastewater, comprising the following steps:

[0028] ①Pretreatment: Adjust the pH value of the electroplating copper-nickel mixed wastewater to 5 in the neutralization tank, and then discharge it into the sedimentation tank to make Fe(OH) 3 Sedimentation and separation of flocs and solid impurities, removal of soluble oil and particulate impurities, and finally control of the oxidation-reduction potential of the wastewater to ≤30mV;

[0029] ②Ion exchange adsorption step: the waste water after the above pretreatment enters the ion exchange device, and the ion exchange resin absorbs and enriches copper and nickel until saturated;

[0030] ③Ion exchange regeneration step: connect the regeneration tank and the ion exchange device, first use hydrochloric acid to regenerate and recover copper and nickel, and then use complexing agents citric acid, ethylenediaminetetraacetic acid, ethanol, and aceto...

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Abstract

The invention relates to a process for enriching copper and nickel in electroplating copper-nickel mixed waste water, belonging to the technical field of environmental protection. The process provided by the invention comprises the following three steps of: pretreatment, ion-exchange absorption and ion-exchange regeneration, wherein in the pretreatment step, Fe3<+> and soluble oil and particle impurities are removed from the waste water, thus effectively preventing resin from being polluted and poisoned, and enabling the ion-exchange method to be successfully applied to enrichment of copper and nickel in the electroplating copper-nickel mixed waste water; and the regeneration step adopts two-step regeneration, improves the reproducibility and ion-exchange treatment capacity of the resin and reduces the operating cost.

Description

technical field [0001] The invention relates to a process for enriching copper and nickel from electroplating copper-nickel mixed wastewater, which belongs to the technical field of environmental protection. Background technique [0002] Electroplating is one of the three major polluting industries in the world today. With the continuous expansion of the scale of the electroplating industry, the amount of wastewater discharged is also increasing. These wastewaters contain harmful substances such as heavy metal ions, organic compounds and other inorganic compounds, which cause great pressure on environmental protection and need to be solved urgently. At present, the single cleaning water containing copper or nickel produced in electroplating production can be recovered through the tank side recovery device, but the collection rate is low, less than 30%. A large number of metal ions enter the sewage station with the surface wastewater through "running, leaking, dripping" and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D21/16
Inventor 王贵喜任艳平
Owner HUZHOU JINTAI PLATING IND
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