Synthetic processing method of hydroxyethylidene pre-plated copper waste water

A hydroxyethylidene diphosphonic acid, comprehensive treatment technology, applied in metallurgical wastewater treatment, water/sewage treatment, neutralization water/sewage treatment, etc. The effect of low volume and low operating cost

Inactive Publication Date: 2010-01-13
南京友盛环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the main complexing agent HEDP and its complexes are not easy to decompose under general light and heat conditions, they are resistant to acid and alkali, chlorine oxidation, and are not easily hydrolyzed under high temperature and high pH conditions....

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: Treat waste water and form (COD 1000mg / l, TP 523mg / l, Cu 2+ 126mg / l). Take a certain amount of scrap steel chips and cast iron chips, mix them in a weight ratio of 1.5:10, soak them in 10% sodium hydroxide for about 10 minutes to remove oil, wash them with water until the pH value is 7, and then soak them in 20% dilute hydrochloric acid for 20 minutes to remove surface oxidation thing. Wash the mixed iron filings with water until the pH value is 7. Take 1200ml of HEDP copper-plating cleaning wastewater, adjust the pH value to 2.0 with industrial sulfuric acid, add 11.5% (138g) of mixed iron filings, and aeration 0.15m 3 / h under the condition of React in a 50×700mm epoxy resin reaction column for 1.5 hours, add PAM to the effluent for flocculation and precipitation, take the supernatant and add milk of lime to adjust the pH value to 11.5, react for 5 minutes, add PAM for flocculation and precipitation, and then neutralize the effluent COD , TP and Cu ...

Embodiment 2

[0023] Embodiment 2: Treating waste water is formed by diluting bath liquid of HEDP copper plating production line of a machinery factory in Xiangtan, Hunan (COD 1000mg / l, TP 523mg / l, Cu 2+ 126mg / l). Take a certain amount of scrap steel chips and cast iron chips, mix them in a weight ratio of 3:10, soak in 15% potassium hydroxide for about 8 minutes to remove oil, wash with water until the pH value is 9, and then soak in 6% dilute sulfuric acid for 15 minutes to remove surface oxidation things. Wash the mixed iron filings with water until the pH value is 7. Take 1200ml of HEDP copper-plating cleaning wastewater, adjust the pH value to 2.5 with hydrochloric acid, add 10% (120g) of mixed iron filings, and aeration 0.05m 3 / h under the condition of React in a 50×700mm epoxy resin reaction column for 2.0 hours, add PAM to the effluent for flocculation and precipitation, take the supernatant and add lime milk to adjust the pH value to 11.7, react for 10 minutes, add PAM for flo...

Embodiment 3

[0024] Embodiment 3: treatment waste water is formed by diluting the tank liquid of HEDP copper plating production line of a machinery factory in Xiangtan, Hunan (COD 1000mg / l, TP 523mg / l, Cu 2+ 126mg / l). Take a certain amount of scrap steel chips and cast iron chips, mix them in a weight ratio of 2:10, soak them in 20% sodium hydroxide for about 10 minutes to remove oil, wash them with water until the pH value is 8.5, and then soak them in 10% dilute hydrochloric acid for 20 minutes to remove surface oxidation things. Wash the mixed iron filings with water until the pH value is 8. Take 1200ml of HEDP copper-plating cleaning wastewater, adjust the pH value to 2.1 with industrial sulfuric acid, add 30% (360g) of mixed iron filings, and aeration 0.2m 3 / h under the condition of React in a 50×700mm epoxy resin reaction column for 0.5h, add PAM to the effluent for flocculation and precipitation, take the supernatant and add lime milk to adjust the pH value to 11.5, react for 2...

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PUM

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Abstract

The invention discloses a synthetic processing method of hydroxyethylidene (HEDP) pre-plated copper waste water. The method essentially comprises the following steps of: taking a certian quantity of waste iron filings and waste steel fillings and mixing; dipping with alkali liquor; washing with water after degreasing; removing oxide on the surfaces of the waste iron filings and the waste steel fillings by being dipped in acid to be standby; adjusting the pH value of the hydroxyethylidene (HEDP) pre-plated copper waste water to be 1.8-2.5; adding with activated mixed iron filings into the HEDP pre-plated copper waste water, wherein adding quantity is 7-30% of the quality of the waste water; after aeration reaction for 0.5-2 hours, water exiting and adding with polyacrylamide (PAM) to be deposited in a flocculation way; and finally adding with lime cream into deposited liquid supernatant, adjusting the pH value to be 11-12, reacting for 5-20 min, adding with the PAM to be deposited in a flocculation way, water exiting, and adjusting the pH value thereof to be discharged or recycled after reaching the standard. The method has simple technology, convenient operation and good processing effect.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a comprehensive treatment method for hydroxyethylidene diphosphonic acid (HEDP) pre-copper-plating wastewater. Background technique [0002] Under the situation that the State Economic and Trade Commission clearly stipulates that "cyanide-containing electroplating" should be eliminated within a time limit, my country has developed a new HEDP copper pre-plating process (patent application number: 200810143146.6). Due to the high stability constant of the complex formed by HEDP and copper ions, the coating has a strong binding force with the base metal (steel, aluminum, magnesium, zinc, titanium and its alloys), and can obtain a copper coating with excellent performance. Development potential of new cyanide-free copper pre-plating process. However, due to the high stability constant of the complex formed by HEDP and copper ions, it is very difficult to tre...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/461C02F1/52C02F1/66C02F103/16
Inventor 戴友芝胡克伟王海阳高宝钗李小娜
Owner 南京友盛环保科技有限公司
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