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A kind of treatment method of alkaline zinc-nickel alloy electroplating wastewater

A technology for electroplating wastewater and treatment method, which is applied in the fields of metallurgical wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The effect of good market application prospect, good economic benefit and environmental benefit

Active Publication Date: 2017-07-28
GUANGZHOU ULTRA UNION CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] An object of the present invention is to propose and solve the problem that the current treatment of alkaline zinc-nickel alloy electroplating wastewater cannot reach the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Under the condition of pH = 8-13, hydrogen peroxide is used to destroy the strong aliphatic amine complexing agent in the alkaline zinc-nickel alloy electroplating wastewater. Since the oxidation reaction is relatively slow, it needs to react for more than 10 hours. Then use sodium dimethyldithiocarbamate to react with heavy metal ions such as zinc and nickel to form precipitates such as zinc dimethyldithiocarbamate and nickel dimethyldithiocarbamate, so that the residual zinc and nickel in wastewater The heavy metal ions meet the requirements in Table 2 of GB 21900-2008 "Electroplating Pollutant Discharge Standard". After the sediment is separated, the wastewater can be discharged up to standard.

[0026] At present, some electroplating wastewater treatment manufacturers use heavy metal scavenger to treat alkaline zinc-nickel alloy electroplating wastewater, and directly add some kind of heavy metal scavenger to the wastewater. Since the wastewater contains aliphatic a...

Embodiment 2

[0042] Major equipment:

[0043] Zinc-nickel alloy electroplating wastewater regulating pool;

[0044] Primary oxidation reaction pool;

[0045] Secondary oxidation reaction pool;

[0046] reduction reaction pool;

[0047] sedimentation tank;

[0048] Flocculation tank;

[0049] Inclined tube sedimentation tank;

[0050] neutralization reaction pool;

[0051] Plate and frame filter press.

[0052] Chemicals:

[0053] Precipitating agent: a mass fraction of 10% sodium dimethyldithiocarbamate aqueous solution;

[0054] Hydrogen peroxide: the mass fraction is 50% hydrogen peroxide diluted 10 times, its mass fraction is 5%;

[0055] Sodium metabisulfite solution: a 10% sodium metabisulfite aqueous solution with a mass fraction;

[0056] Flocculant: polyacrylamide aqueous solution with a mass fraction of 0.5%;

[0057] Dilute sulfuric acid: dilute concentrated sulfuric acid 10 times;

[0058] Sodium hydroxide solution: the mass fraction is 5% sodium hydroxide solution. ...

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PUM

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Abstract

The invention discloses a method for treating alkaline zinc-nickel alloy electroplating wastewater. The method includes destructing strong fatty amine complex agents in the alkaline zinc-nickel alloy electroplating wastewater by the aid of hydrogen peroxide under the condition of pH (potential of hydrogen) of 8-13; enabling dimethyl carbamodithioic acid and heavy metal ions of zinc, nickel and the like to react with one another to generate precipitates of zinc dimethyldithiocarbamate, nickel dimethyldithiocarbamate and the like, and enabling residual heavy metal ions of zinc, nickels and the like in the wastewater to meet requirements of a table 2 in GB 21900-2008 Electroplating Pollutant Discharge Standards. Slow oxidation reaction needs to be carried out for longer than 10h. The method has the advantage that discharge standards can be met by the wastewater after the precipitates are separated from the wastewater.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a treatment method for alkaline zinc-nickel alloy electroplating wastewater. Background technique [0002] With the development of science and technology and the market, the requirements for anti-corrosion coating are getting higher and higher, and the traditional galvanizing process can no longer meet the requirements of modern industry. Electroplating zinc-nickel alloy is an anodic protective coating that has emerged in the past 20 years. This coating not only has corrosion resistance 7 to 10 times higher than that of galvanized coating, but also has good paintability, weldability and formability. Excellent salt spray resistance and low hydrogen embrittlement, suitable for springs, fasteners and parts used at higher temperatures that require fatigue resistance, so it is widely used in industries such as automobiles, aerospace, light industrial appliances, etc. [1] . [000...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/16
Inventor 赖奂汶郭崇武
Owner GUANGZHOU ULTRA UNION CHEM LTD
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