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Method and equipment for standards-reaching treatment of chemical nickel plating waste liquid

A technology of electroless nickel plating and treatment methods, applied in chemical instruments and methods, metallurgical wastewater treatment, water/sewage multi-stage treatment, etc., can solve problems such as water eutrophication, heavy metal pollution, resource waste, etc.

Pending Publication Date: 2016-07-27
SHANGHAI LIGHT IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the waste liquid is not handled properly, it is not only a waste of resources, but also may lead to heavy metal pollution and eutrophication of water bodies

Method used

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  • Method and equipment for standards-reaching treatment of chemical nickel plating waste liquid
  • Method and equipment for standards-reaching treatment of chemical nickel plating waste liquid
  • Method and equipment for standards-reaching treatment of chemical nickel plating waste liquid

Examples

Experimental program
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Effect test

Embodiment

[0058] Take the waste liquid of electroless nickel plating from an enterprise, first use chelating ion exchange resin to absorb nickel, then add 6g of ferrous sulfate + 3ml of hydrogen peroxide per liter of waste liquid, and react for 1 hour. Then add MgCl according to 1.5 times the theoretical dosage 2 ·6H 2 O and Na 2 HPO 4 12H 2 O precipitating agent, control the reaction pH at 8.0-9.0, fully stir the reaction for 20 minutes, precipitate and filter; then add sodium hypochlorite according to the Cl / N mass ratio of 10:1, and keep stirring, stand for 15min after the reaction, precipitate and filter, and obtain supernatant. First pass 80 mg / L ozone into the supernatant for 10 hours, then at a pH of 9 and a temperature of 80°C, make the ratio of calcium to phosphorus 5:1, keep stirring for 5 hours, let stand for 15 minutes, precipitate and filter to obtain the above The supernatant was tested.

[0059]

[0060] The electroless nickel plating waste liquid standard treatm...

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Abstract

The invention relates to a method and equipment for standards-reaching treatment of chemical nickel plating waste liquid. The method comprises the steps: adsorbing nickel ions from the chemical nickel plating waste liquid by using an ion exchange method; treating the chemical nickel plating waste liquid subjected to the ion exchange method treatment by using a Fenton method so as to carry out oxygenolysis on part of organic pollutants in wastewater, achieve an oxidated decomplexing effect and convert complex-form metal nickel ions into free-form nickel ions, meanwhile, oxidating organic substances in the waste liquid, destroying carbon chain structures of the organic substances, finally converting the organic substances into carbon dioxide and water, and lowering the COD of the wastewater; treating the chemical nickel plating waste liquid subjected to the Fenton method treatment by using an ammoniomagnesium phosphate precipitation method, carrying out a reaction so as to produce indissoluble ammoniomagnesium phosphate precipitates, thereby removing ammonia nitrogen from the wastewater; carrying out further ammonia nitrogen removal by using a break-point chlorination method; and removing phosphorus from the wastewater by using ozone as an oxidant and calcium hypochlorite precipitation. According to the method and equipment for the standards-reaching treatment of the chemical nickel plating waste liquid, disclosed by the invention, the standards-reaching emission of nickel, phosphorus, COD and ammonia nitrogen can be simultaneously achieved.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment and water pollution control in electroplating or surface treatment industries, in particular to a method and equipment for treating electroless nickel plating waste liquid up to standard. Background technique [0002] Electroless nickel plating is a surface treatment technology that has developed rapidly in recent years. It is a finishing method that generates Ni and P coatings through the action of nickel salt and hypophosphite. Electroless nickel plating is widely used in various fields due to its advantages of uniform coating, no need for external power supply, high hardness, good wear resistance, and plating not limited by the size and shape of parts. With the continuous expansion of the application scope and production scale of electroless nickel plating, the resulting electroless nickel plating waste solution is also more and more serious to the environmental pollution. There a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16
Inventor 付丹朱昊辰戴亮李光明
Owner SHANGHAI LIGHT IND RES INST
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