Treating, recovering and reutilizing method for electroplating waste liquid containing heavy metals

A technology for electroplating waste liquid and heavy metals, which is applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc. Foreground effect

Active Publication Date: 2007-01-24
SANDA FILM SCI & TECH XIAMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the harm of heavy metals to the environment still exists for a long time, often causing pollution

Method used

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  • Treating, recovering and reutilizing method for electroplating waste liquid containing heavy metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) Complexation: Take 1L of copper electroplating solution with a copper concentration of 60mg / L, add 1L of complexing agent with a concentration of 1.7g / L and 0.1L of NaOH solution with a concentration of 1g / L, and adjust the pH to 6-7 under stirring , stirring time 20min.

[0021] 2) Ultrafiltration: pump the copper-containing complex solution into the ultrafiltration equipment for ultrafiltration concentration, remove a large amount of impurities such as water and small molecules, and obtain 1L of ultrafiltrate to enter the next process. The selected ultrafiltration membrane is a polyvinylidene fluoride membrane with a molecular weight cut-off of 50,000 (such as flat membranes such as UF605-2 and UF610 in the United States). The ultrafiltration process conditions are: room temperature, inlet pressure 3Bar, outlet pressure 1Bar, and concentration times 2 times. Under the experimental conditions, copper can be removed by 98.1% during the complex ultrafiltration process...

Embodiment 2

[0026] 1) Complexation: Add 1L of complexing agent with a concentration of 1.8g / L and 0.1L of NaOH with a concentration of 1g / L to 1L of chromium electroplating solution with a chromium ion concentration of 200mg / L, and adjust the pH to 6~ 7. Stirring time is 20min.

[0027] 2) Ultrafiltration: Pump the chromium-containing complex solution into the ultrafiltration equipment for ultrafiltration concentration, remove a large amount of impurities such as water and small molecules, and the ultrafiltrate enters the next process. The selected ultrafiltration membrane is a polyvinylidene fluoride membrane with a molecular weight cut-off of 50,000 (such as flat membranes such as UF605-2 and UF610 in the United States). The ultrafiltration process conditions are: room temperature, inlet pressure 3Bar, outlet pressure 1Bar, concentration factor 1.8 times, under the test conditions, 98.3% of chromium can be removed in the process of complex ultrafiltration, and the concentration of chrom...

Embodiment 3

[0032] 1) Complexation: Add 1L of complexing agent with a concentration of 1.9g / L and 0.1L of NaOH with a concentration of 1g / L to 1L of nickel electroplating solution with a nickel concentration of 220mg / L, and adjust the pH to 6-7 while stirring. 20min.

[0033] 2) Ultrafiltration: Pump the nickel-containing complex solution into the ultrafiltration equipment for ultrafiltration concentration, remove a large amount of impurities such as water and small molecules, and the ultrafiltrate enters the next process. The selected ultrafiltration membrane is a polyvinylidene fluoride membrane with a molecular weight cut-off of 50,000 (such as flat membranes such as UF605-2 and UF610 in the United States). The ultrafiltration process conditions are: room temperature, inlet pressure 3Bar, outlet pressure 1Bar, concentration factor 2.1 times, under the test conditions, nickel can be removed by 98.3% during the complex ultrafiltration process, and the nickel concentration in the permeate...

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Abstract

The present invention relates to treatment of waste electroplating solution, and is especially method of treating waste electroplating solution containing Cu, Cr, Cd, Ni and other heavy metals and recovering heavy metals. The method includes the following steps: adding water soluble great molecular weight polymer into the waste electroplating solution to form complex of heavy metal ions, ultrafiltering to obtain concentrated liquid with enriched heavy metal ions, adding sulfuric acid to the ultrafiltrate to acidify and decomplex the heavy metal ions, ulterfiltering the decomplexed solution, returning the concentrated liquid with enriched complex agent to the complexing step, treating the ultrafiltered dialysate through reverse osmosis to obtain concentrated heavy ion solution, and returning the concentrated heavy ion solution to the electroplating step.

Description

technical field [0001] The invention relates to a method for treating electroplating waste liquid, in particular to a method for treating electroplating waste liquid containing heavy metals such as copper, chromium, cadmium and nickel, and a method for recycling the heavy metal. Background technique [0002] In today's increasingly tense water resources, membrane technology for the purpose of wastewater reuse and material recovery, as a new and efficient water treatment technology, has received widespread attention from water processors in various countries, especially the more mature ultrafiltration technology in wastewater. The application in processing will be more extensive. The electroplating industry is an important processing industry in my country. At present, zinc plating, copper plating, cadmium plating, nickel plating and chrome plating are mainly used, and they are concentrated in the industrial fields of machine manufacturing, light industry, electronics, aerosp...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F1/62C02F1/44
Inventor 刘久清饶金珠蓝伟光严滨陈冠益
Owner SANDA FILM SCI & TECH XIAMEN
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