Method for treating alkaline zinc-nickel alloy electroplating waste water

A technology of electroplating wastewater and zinc-nickel alloy, which is applied in multi-stage water treatment, metallurgical wastewater treatment, chemical instruments and methods, etc., can solve the problems of large reaction equipment and wastewater treatment equipment that cannot be connected, and achieve good market application prospects and strong Precipitation ability and the effect of simplifying the treatment process

Active Publication Date: 2018-03-30
GUANGZHOU ULTRA UNION CHEM LTD
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AI Technical Summary

Problems solved by technology

This method takes 10 hours to oxidize with hydrogen peroxide and requires relatively large reaction equipment. At present, small and medium-sized electroplating enterprises...

Method used

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  • Method for treating alkaline zinc-nickel alloy electroplating waste water
  • Method for treating alkaline zinc-nickel alloy electroplating waste water

Examples

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Embodiment 1

[0034] Step 1. Adjust the pH value

[0035] Transfer the alkaline zinc-nickel alloy electroplating wastewater containing less than 10 mg / L nickel from the electroplating wastewater adjustment pool to the pH adjustment pool, stir the pool solution, add dilute sulfuric acid to adjust the alkaline zinc-nickel alloy electroplating wastewater to pH=3-4.

[0036] Step 2. Precipitate heavy metal ions

[0037] The electroplating waste water flows into the sedimentation reaction tank, and under stirring conditions, adding mass fraction in every ton of waste water is 20L of sodium diethyldithiocarbamate aqueous solution of 15%; 0.4%) to aggregate the precipitated particles; add dilute sulfuric acid or sodium hydroxide solution to adjust the pH of the electroplating wastewater to 4.5-5.5; the electroplating wastewater flows from the flocculation tank into the inclined tube sedimentation tank, and the sediment sinks to the bottom of the sedimentation tank.

[0038] Step 3. Reduce COD

...

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Abstract

The invention discloses a method for treating an alkaline zinc-nickel alloy electroplating waste water. The method comprises the following steps: adjusting the pH of the alkaline zinc-nickel alloy electroplating waste water to be 3-4, adding an aqueous solution of sodium diethyldithiocarbamate for precipitating zinc and nickel, and adding a flocculating agent to make precipitation particles aggregated; adjusting the pH of the electroplating waste water to be 4.5-5.5, and adding a sodium hypochlorite solution; and adjusting the pH of the treated electroplating waste water to be 6-9 to obtain required matter. The treatment method for the alkaline zinc-nickel alloy electroplating waste water provided by the invention can completely precipitate zinc and nickel ions with the sodium diethyldithiocarbamate through controlling the pH of the waste water in a sedimentation tank to be 4.5-5.5; and hydrogen peroxide does not need to be added to destroy aliphatic polyamine strong complexing agentsin the waste water, so that the treatment process is simplified, and the treatment process can interface with current electroplating waste water treatment equipment, solves the difficulty in the treatment of the alkaline zinc-nickel alloy electroplating waste water, and has better market application prospects.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for treating alkaline zinc-nickel alloy electroplating wastewater, especially a method for precipitating zinc and nickel ions in alkaline zinc-nickel alloy electroplating wastewater. Background technique [0002] Zinc-nickel alloy coatings have excellent corrosion resistance and have been widely used as protective coatings for automobiles and other accessories. Alkaline zinc-nickel alloy plating solution contains about 3% aliphatic polyamine complexing agent. This complexing agent has high stability. Oxidation with hydrogen peroxide or bleaching water at room temperature cannot effectively destroy these complexing agents. Therefore, in the popularization and use of the alkaline zinc-nickel alloy electroplating process, it has been facing the difficulty of electroplating wastewater treatment. [0003] The Chinese invention patent "A Treatment Met...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/16
CPCC02F1/54C02F1/56C02F1/66C02F1/76C02F9/00C02F2103/16C02F2301/08
Inventor 郭崇武赖奂汶
Owner GUANGZHOU ULTRA UNION CHEM LTD
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