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Method for recycling and treating electroplating wastewater

A technology for the recycling and treatment of electroplating wastewater, which is applied in metallurgical wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., and can solve problems such as secondary pollution, resource waste, and non-recyclable metal ions

Active Publication Date: 2015-07-15
HUBEI FORBON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a single type of electroplating wastewater, such as chromium-containing wastewater, nickel-containing wastewater or copper-containing wastewater, the treatment method is relatively simple. However, for electroplating mixed wastewater containing various heavy metal ions, a single method cannot produce good treatment effects. Currently, For electroplating mixed wastewater containing multiple metal ions, the commonly used method is chemical precipitation, which is to convert heavy metal ions into sedimentation sludge for separation. However, this method only transfers heavy metal ions from wastewater to sludge, which is likely to cause secondary pollution. pollution, and metal ions cannot be reused, resulting in waste of resources

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  • Method for recycling and treating electroplating wastewater

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Experimental program
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Effect test

Embodiment 1

[0020] (1) Filter 1L of industrial electroplating wastewater with a chromium content of 55ppm, a nickel content of 48ppm, a copper content of 37ppm, a zinc content of 74ppm, and a pH of 6.0, and the filtrate enters the next step.

[0021] (2) the filtrate in step (1) is first passed through an acidic cation exchange column to remove Ni in the waste water 2+ 、Cu 2+ and Zn 2+ At this time, the wastewater mainly contains chromium ions, and then passes through the basic anion exchange column to further remove Cr 2 o 7 2- , at this time the wastewater contains Ni 2+ 0.54ppm, containing Cu 2+ 0.36ppm, including Zn 2+ It is 0.63ppm and contains 0.22ppm Cr(Ⅵ), which can be used as reused water or discharged.

[0022] (3) The anion exchange column recovers 0.21g of chromate through elution; the eluent of the cation exchange column mainly contains Ni 2+ 、Cu 2+ and Zn 2+ , metered into ammonium chloride and phosphoric acid, adjust the pH to 6.0, react for 30min, wherein the mol...

Embodiment 2

[0025] (1) 2L chromium content is 80ppm, nickel content is 64ppm, copper content is 61ppm, zinc content is 93ppm, pH is 3.0 industrial electroplating waste water is filtered, and filtrate enters next step process.

[0026] (2) The filtrate in step (1) is first passed through a strongly acidic cation exchange column to remove Ni in the waste water 2+ 、Cu 2+ and Zn 2+ At this time, the wastewater mainly contains chromium ions, and then passes through the basic anion exchange column to further remove Cr 2 o 7 2- , at this time the wastewater contains Ni 2+ 0.63ppm, containing Cu 2+ 0.52ppm, containing Zn 2+ 0.71ppm, containing 0.35ppm Cr(Ⅵ), which can be used as reused water or discharged.

[0027] (3) The anion exchange column can recover 0.54g of chromate after elution. The eluent of the cation exchange column mainly contains Ni 2+ 、Cu 2+ and Zn 2+ , metering ammonium sulfate and sodium dihydrogen phosphate, adjusting the pH to 8.0, reacting for 60min, wherein the mo...

Embodiment 3

[0030] (1) 5L chromium content is 68ppm, nickel content is 56ppm, copper content is 54ppm, zinc content is 81ppm, and pH is 4.5 industrial electroplating waste water is filtered, and filtrate enters next step process.

[0031] (2) the filtrate in step (1) is first passed through an acidic cation exchange column to remove Ni in the waste water 2+ 、Cu 2+ and Zn 2+ At this time, the wastewater mainly contains chromium ions, and then passes through the basic anion exchange column to further remove Cr 2 o 7 2- , at this time the wastewater contains Ni 2+ 0.59ppm, containing Cu 2+ 0.47ppm, containing Zn 2+ It is 0.66ppm and contains 0.28ppm Cr(Ⅵ), which can be used as reused water or discharged.

[0032] (3) The anion exchange column can recover 1.18g of chromate after elution. The eluent of the cation exchange column mainly contains Ni 2+ 、Cu 2+ and Zn 2+ , metered into ammonia workshop wastewater and pretreated phosphorus-containing wastewater, adjust the pH to 7.0, react...

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Abstract

The invention discloses a method for recycling and treating electroplating wastewater. The method comprises the following steps: filtering the industrial electroplating wastewater with the chromium content of 55-80 ppm, the nickel content of 48-64 ppm, the copper content of 37-61 ppm, the zinc content of 74-93 ppm and the pH of 3.0-6.0, loading on an ion exchange column, wherein the ion exchanged wastewater can be used as workshop recovery water or can be discharged; eluting an anion exchange column to recover chromate, metering the cation exchange column eluent and adding a N source and a P source, controlling the pH value to 6.0-8.0, and reacting for 30-60 min, wherein the molar ratio X<2+>:N:P is (1-1.2): 1.0: (1.5-3.0), X<2+> is the sum of the molar concentration of SNi<2+>, Cu<2+> and Zn<2+>; performing solid-liquid separation to obtain ammonium phosphate controlled-release micro element fertilizer after the reaction; adjusting the clear liquid till the pH value is 9.0-11.0 by using 10% lime slurry, reacting for 10-30 min, then adding a flocculating agent, standing, separating out the sediment which can be used as feed calcium, adjusting the liquid supernatant till the pH value is 6.0-9.0 and discharging after reaching the standard. The wastewater processing method is simple in technological process, easy in operation and good in processing effect, and the wastewater and each metal ion can be effectively recycled.

Description

technical field [0001] The invention relates to the fields of chemical technology and water treatment, in particular to a method for recycling and treating electroplating wastewater. Background technique [0002] Electroplating is the use of chemical or electrochemical methods to plate various metal films on the surface of metals or other materials. This technology is widely used in machine manufacturing, light industry, electronics and other industries. The main sources of industrial electroplating wastewater are cleaning water for plating parts, waste electroplating solution, floor flushing water in electroplating workshops, and wastewater generated from surface treatment of plating parts. Its composition is complex, generally containing chromium, nickel, copper, zinc, gold, silver, etc. Heavy metal ions and cyanide are highly toxic and have a huge destructive effect on the environment. Therefore, how to recycle heavy metal ions in electroplating wastewater has always bee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C05B17/00C02F103/16
Inventor 王瑞王仁宗刘裕李江鹏
Owner HUBEI FORBON TECH