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Recycling process of nickel in plating waste water

A technology for electroplating wastewater and electroplating waste liquid, which is applied in photography technology, photography auxiliary technology, metallurgical wastewater treatment and other directions, can solve the problems of difficult recovery, difficulty in meeting environmental protection discharge requirements, and low nickel content in nickel-containing products.

Active Publication Date: 2012-07-18
HUNAN VARY TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Using this method to treat nickel-containing wastewater is not only difficult to meet environmental protection discharge requirements, but also the resulting nickel-containing products are difficult to recycle due to low nickel content

Method used

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  • Recycling process of nickel in plating waste water

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Embodiment Construction

[0008] First, add sulfuric acid or sodium hydroxide with a concentration of 10-60% according to the production process requirements of nickel electrowinning, and adjust the pH value of the solution to between 2.5 and 6.5. Coated titanium anode, the material of the cathode is titanium metal. The equipment is equipped with a solution pH adjustment device to ensure the cathode current efficiency in the electrowinning process. The solution is continuously circulated during the electrowinning process. When the nickel ion concentration of the solution is reduced to 0.2-0.5g / L by an electrowinning process, the solution is discharged to the resin adsorption process for adsorption treatment. The specific electrowinning process parameters are as follows:

[0009] Nickel ion initial concentration: 1-8g / L

[0010] Cathode current density: 160-200A / m 2

[0011] Electrodeposition temperature: 15-55°C

[0012] Electrolytic fluid circulation speed: 10-100L / min

[0013] Cathode rotation...

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Abstract

The invention discloses a resource treatment process for nickel-contained plating waste water, which belongs to the waste water treatment of a plating industry. The recycling process is divided into three steps: electro-deposition, adsorption and secondary electro-deposition, wherein the plating waste liquid is conveyed to an electro-deposition trough to be electro-deposited after the pH value is adjusted to a given number, after nickel content in the solution is reduced to a designated value, the solution is conveyed to an adsorption column to be adsorbed, the nickel content of the plating waste water after being treated is less than 1ppm, and partial waste water is returned to a plating procedure to use. The nickel in the plating waste liquid is recycled in a metal state. After the adsorption column is saturated, backwashing and reproduction are carried out, and secondary electro-deposition is undertaken on the backwashed solution to obtain the metal nickel.

Description

Technical field: [0001] The invention relates to a wastewater treatment technology in the electroplating industry, in particular to a nickel recovery and resource recovery process in the electroplating wastewater. Background technique: [0002] The electroplating industry produces a large amount of electroplating nickel-containing wastewater every year. Direct discharge is not only a waste of resources, but also causes great pollution to the environment. At present, the method of adjusting the pH value of wastewater is mainly used to precipitate nickel. Using this method to treat nickel-containing wastewater is not only difficult to meet environmental protection discharge requirements, but also the resulting nickel-containing products are difficult to recycle due to low nickel content. Invention content: [0003] The technical problem to be solved by the present invention is to provide a nickel-containing electroplating waste water recovery technology with high nickel rec...

Claims

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Application Information

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IPC IPC(8): C02F9/08C02F1/461C02F1/42C02F1/62C25D21/16C25C1/08C02F103/16
Inventor 陈建敏周军解付兵张勇张元旦赵建成
Owner HUNAN VARY TECH
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