Method for treating alkaline zinc-nickel alloy electroplating wastewater

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

Active Publication Date: 2020-06-09
GUANGZHOU ULTRA UNION CHEM LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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 cannot connect with the existing wastewater treatment equipment when implementing this scheme, and the reconstruction of wastewater treatment equipment is restricted by the site.

Method used

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  • Method for treating alkaline zinc-nickel alloy electroplating wastewater
  • Method for treating alkaline zinc-nickel alloy electroplating wastewater

Examples

Experimental program
Comparison scheme
Effect test

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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PUM

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Abstract

Disclosed is a method for treating alkaline zinc-nickel alloy electroplating wastewater, the method involving adjusting the pH of alkaline zinc-nickel alloy electroplating wastewater to 3-4, adding an aqueous solution of sodium diethyldithiocarbamate to precipitate zinc and nickel, and adding a flocculant to make precipitated particles aggregate; adjusting the pH of the electroplating wastewater to 4.5-5.5, and further adding a sodium hypochlorite solution; and adjusting the pH of the treated electroplating wastewater to 6-9.

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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Patent Type & Authority Patents(China)
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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