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Recovery and comprehensive utilization process for electroplating wastewater

A technology of electroplating wastewater and process, applied in metallurgical wastewater treatment, multi-stage water treatment, water/sewage treatment and other directions, can solve problems such as teratogenicity, high toxicity and mutagenicity

Inactive Publication Date: 2016-04-06
悦斯莱特灯饰照明(河源)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water quality of electroplating heavy metal sewage treatment is complex and its composition is difficult to control. It contains heavy metal pollutants such as cyanide, acid, alkali, hexavalent chromium, copper, zinc, cadmium, nickel, gold, silver, etc., which are highly toxic, and some are carcinogenic, Teratogenic and mutagenic highly toxic substances that are extremely harmful to humans

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A process for recycling and comprehensive utilization of electroplating wastewater, comprising the following steps:

[0019] 1) adjusting the pH value of the electroplating wastewater to 2;

[0020] 2) Add sodium pyrophosphite as a reducing agent to reduce dichromate or chromate in water to trivalent chromium, or add sodium pyrosulfite according to the amount of hexavalent chromium;

[0021] 3) Adjust the pH value of the electroplating wastewater to 9.0 to form a precipitate and filter it;

[0022] 4) the precipitate is dried, and the chromium hydroxide product with a chromium content of 25% is determined by titration;

[0023] 5) Dissolved with sulfuric acid to generate chromium sulfate, concentrated and evaporated to a crude product.

[0024] In said step 3), if there are copper ions and nickel ions, the available percentage of precipitation is 5% ammonia water plus 15% ammonium sulfate by mass, so that the pH value of the solution is 8.5, leaching for 2h, so that c...

Embodiment 2

[0026] A process for recycling and comprehensive utilization of electroplating wastewater, comprising the following steps:

[0027] 1) The electroplating wastewater is adjusted to a pH value of 3;

[0028] 2) Add sodium pyrophosphite as a reducing agent to reduce dichromate or chromate in water to trivalent chromium, or add sodium pyrosulfite according to the amount of hexavalent chromium;

[0029] 3) Adjust the pH value of the electroplating wastewater to 8.5 to form a precipitate and filter it;

[0030] 4) the precipitate is dried, and the chromium hydroxide product with a chromium content of 45% is determined by titration;

[0031] 5) Dissolved with sulfuric acid to generate chromium sulfate, concentrated and evaporated to a crude product.

[0032] In said step 3), if there are copper ions and nickel ions, the available percentage of precipitation is 5% ammonia water plus 15% ammonium sulfate by mass, so that the pH value of the solution is 8.0, leaching for 2h, so that c...

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Abstract

The invention discloses a recovery and comprehensive utilization process for electroplating wastewater. The process includes the following steps of firstly, regulating the pH value of electroplating wastewater to 2-3; secondly, adding a reducing agent to reduce dichromate ions or chromate ions in water into trivalent chromium; thirdly, regulating the pH value of electroplating wastewater to 8.5-9.0 to form sediment, and conducting filtration; fourthly, drying sediment, and determining a chromic hydroxide product with the chromium content of 25-45% through the titrimetry method; fifthly, dissolving the product through sulfuric acid to generate chromium sulfate, and conducting concentration and evaporation to form a crude product. By means of the recovery and comprehensive utilization process for electroplating wastewater, chromium salt can be recovered from chromium-containing wastewater, and discharged water can reach the emission standard.

Description

technical field [0001] The invention relates to a recycling and comprehensive utilization process of electroplating wastewater. Background technique [0002] Electroplating is a process that uses electrochemical methods to decorate, protect and obtain certain new properties on metal and non-metal surfaces. In order to ensure the quality of electroplating products, so that the metal coating has a smooth and good appearance and is firmly combined with the substrate, the dirt (oil, rust, scale, etc.) Finally, clean the adhesion solution on the surface of the plated parts. Therefore, a large amount of electroplating wastewater must be discharged in the general electroplating production process, and electroplating wastewater treatment and heavy metal wastewater treatment must be carried out. [0003] Electroplating wastewater treatment is a difficult and more complex mixed heavy metal wastewater treatment. Electroplating wastewater treatment must be based on factors such as the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01G37/08C02F103/16
CPCC02F9/00C01G37/08C02F1/66C02F1/705C02F2301/08
Inventor 吴磊
Owner 悦斯莱特灯饰照明(河源)有限公司
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