Treatment method of chemical nickel-plating wastewater

A treatment method and electroless nickel plating technology, applied in the fields of metallurgical wastewater treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of natural environment damage, high treatment cost, excessive total nickel, etc. The effect of low investment cost and reduced operating cost

Active Publication Date: 2015-09-09
SUZHOU ZHANQING ENVIRONMENT PROTECTION TECHCO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the plating solution of electroless nickel plating contains a large amount of complexing agents such as organic acids and organic amines and reducing agents such as sodium hypophosphite, which makes it very difficult to treat the high-concentration waste liquid and cleaning wastewater produced by electroless nickel plating.
Firstly, hypophosphite is not easy to remove, resulting in excessive total phosphorus, and secondly, nickel ions are complexed, resulting in excessive total nickel
[0004] For electroless nickel plating wastewater, traditional treatment processes include sodium hypochlorite oxidation, Fenton oxidation, recapture agent method, chelating resin method, etc., but there are problems such as high treatment cost and incomplete treatment.
For example, recapture agents and chelating resins can treat the total nickel up to the standard, but have no effect on the removal of complexing agents and hypophosphite in water, resulting in excessive total phosphorus and COD; sodium hypochlorite oxidation and Fenton oxidation can Destroying most of the complexing agents and adjusting the pH can make the total nickel reach the standard, but the removal rate of hypophosphite is very low, resulting in the total phosphorus exceeding the standard
[0005] In short, for electroless nickel plating wastewater, the treatment cost of traditional technology is high, and the removal effect of total phosphorus is not good, so the total phosphorus of this kind of wastewater is easy to exceed the standard, causing damage to the natural environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The waste water produced by electroless nickel plating in a certain factory is mixed with washing tank water. The total nickel in the waste water is about 2g / L, and the total phosphorus is about 2g / L. It was entrusted to a company as hazardous waste before, and the disposal cost was about 2,000 yuan / ton.

[0028] Adopt technical scheme of the present invention to process below:

[0029] First, prepare hypophosphorous remover: mix 100g of anhydrous aluminum sulfate, 200g of magnesium oxide and 5g of ferrous sulfate heptahydrate, and set aside.

[0030] Secondly, adjust the pH of the waste water to be treated to pH=2, then add the above-mentioned hypophosphorous remover, the dosage is 10g / L, stir well and then add hydrogen peroxide, the dosage of hydrogen peroxide is 10g / L, adjust the pH to pH after 60 minutes of reaction = 3, a large amount of insoluble solids are formed. After filtering with a filter press, add sodium hydroxide to the filtrate to adjust the pH = 10.5. ...

Embodiment 2

[0032] For the cleaning water of chemical nickel plating in a factory, total nickel = 114mg / L, total phosphorus = 600mg / L. The Fenton oxidation process was used before, and the total phosphorus in the effluent was still greater than 100mg / L.

[0033] Adopt technical scheme of the present invention to process below:

[0034] First, prepare hypophosphorous remover: mix 100g of anhydrous aluminum sulfate, 100g of magnesium oxide and 1g of ferrous sulfate heptahydrate, and set aside.

[0035] Secondly, adjust the pH of the waste water to be treated to pH = 4, then add the above-mentioned hypophosphorous remover, the dosage is 6g / L, stir well and then add hydrogen peroxide, the dosage of hydrogen peroxide is 6g / L, adjust the pH to pH after 30 minutes of reaction = 4, a large amount of insoluble solids are formed. After adding PAM for flocculation and precipitation, add sodium hydroxide to the effluent to adjust pH = 10.5. After adding PAC / PAM for flocculation and precipitation, th...

Embodiment 3

[0037] In the cleaning water produced by electroless nickel plating in a factory, the total nickel is about 100mg / L, and the total phosphorus is about 100mg / L. The sodium hypochlorite oxidation process was used before, and the total phosphorus in the effluent was still higher than 60mg / L.

[0038] Adopt technical scheme of the present invention to process below:

[0039] First, prepare hypophosphorous remover: mix 100g of anhydrous aluminum sulfate, 50g of magnesium oxide and 2g of ferrous sulfate heptahydrate, and set aside.

[0040] Secondly, adjust the pH of the waste water to be treated to pH=2.5, then add the above-mentioned hypophosphorous remover, the dosage is 1g / L, stir well and then add hydrogen peroxide, the dosage of hydrogen peroxide is 1g / L, adjust the pH to pH after 30 minutes of reaction = 4.5, a large amount of insoluble solids are formed. After the insolubles are separated by air flotation technology, lime is added to the effluent to adjust the pH = 10.5. Af...

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Abstract

The invention discloses a treatment method of chemical nickel-plating wastewater. By the aid of hydrogen peroxide, hypophosphite remover can directly react with sodium hypophosphite to generate dissoluble hypophosphite precipitation under the acid condition, and total phosphorus can be more thoroughly removed; the hypophosphite remover contains trace ferrous ions, capable of catalyzing the hydrogen peroxide to generate hydroxyl free radicals of high oxidability, thus organic acid and organic amine complexing agents in the wastewater are completely destroyed. Therefore, after adjusting to alkalinity, the nickel in the wastewater can be directly removed by precipitating, and high-cost chemicals such as chelate resin and recapture agent are needed. The treatment method has no special requirements on equipment, thus investment cost is low, the cost of the chemicals used is low, and running cost is greatly lowered.

Description

technical field [0001] The invention relates to a treatment method for electroless nickel plating wastewater. Background technique [0002] Electroless nickel plating does not require an external current, but uses a reducing agent to reduce the nickel ions in the plating solution and deposit them on the surface of the plated part at the same time. Because this type of plating is suitable for plating pieces of various shapes and materials, and has the advantages of low equipment investment cost and uniform coating, the application range is more and more extensive. [0003] However, the plating solution of electroless nickel plating contains a large amount of complexing agents such as organic acids and organic amines and reducing agents such as sodium hypophosphite, which makes it very difficult to treat the high-concentration waste liquid and cleaning wastewater produced by electroless nickel plating. . The first is that hypophosphite is not easy to remove, resulting in exc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F9/04C02F103/16
Inventor 王磊李星桥路朋朋
Owner SUZHOU ZHANQING ENVIRONMENT PROTECTION TECHCO LTD
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