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Purification process of electroplating waste liquid

A technology for electroplating waste liquid and process, which is applied in the field of purification process of electroplating waste liquid, can solve the problems that the quality of the electroplating layer is greatly affected, hinder the recycling of waste chromic anhydride, etc., so as to save the cost of raw materials and pollutant treatment costs, reduce external The effect of pollution

Inactive Publication Date: 2016-05-04
CHONGQING QINGTIAN ENVIRONMENTAL PROTECTION MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, whether it is based on the direction of sustainable development, environmental protection or considerations for the protection of craftsmen, manufacturers in the industry are constantly adjusting their processes to improve the utilization of chromic anhydride. However, in actual production, waste chromium The acid anhydride bath contains impurity ions such as iron, zinc, copper, and trivalent chromium, among which divalent chromium and trivalent chromium ions have a greater impact on the quality of the electroplating layer, which seriously hinders the recycling of waste chromic anhydride

Method used

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  • Purification process of electroplating waste liquid
  • Purification process of electroplating waste liquid
  • Purification process of electroplating waste liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0053] Chromic anhydride content: 262g / kg, sulfate ion content: 4.1g / kg, trivalent chromium ion content: 3.6g / kg, copper ion content: 1.79g / kg, iron ion content: 5.84g / kg, zinc ion Content: 1.25g / kg, chloride ion content: 9.9g / kg electroplating waste liquid at room temperature, after hydrogen peroxide oxidation and activated carbon filtration, and then through the pressure pump at a pressure of 0.2MPa, into the first filter for the second One time filtration, the filtration flow rate is 400L / h, the filtration flow rate is maintained, and the second filtration is performed through the second filter to obtain the filtered electroplating waste liquid.

[0054] Maintain the filtration flow rate. After the filtered electroplating waste liquid obtained in the above steps is adsorbed by the first resin column filled with 45% sulfonic acid group cation exchange resin and 55% amino anion exchange resin, a treatment waste liquid is obtained; Then the first-stage treatment waste liquid obta...

Embodiment 2

[0063] Chromic anhydride content: 404g / kg, sulfate ion content: 3.3g / kg, trivalent chromium ion content: 4.0g / kg, copper ion content: 2.31g / kg, iron ion content: 6.35g / kg, zinc ion Content: 2.02g / kg, chloride ion content: 4.9g / kg electroplating waste liquid at room temperature, after hydrogen peroxide oxidation and activated carbon filtration, and then through the pressure pump at a pressure of 0.4MPa, into the first filter for the second One time filtration, the filtration flow rate is 600L / h, the filtration flow rate is maintained, and the second filtration is performed through the second filter to obtain the filtered electroplating waste liquid.

[0064] Maintain the filtration flow rate. After the filtered electroplating waste liquid obtained in the above steps is adsorbed by the first resin column filled with 43% sulfonic acid group cation exchange resin and 54% amino anion exchange resin, a treatment waste liquid is obtained; maintain the flow rate Then the first-stage trea...

Embodiment 3

[0067] Chromic anhydride content: 520g / kg, sulfate ion content: 3.6g / kg, trivalent chromium ion content: 5.0g / kg, copper ion content: 2.81g / kg, iron ion content: 7.35g / kg, zinc ion Content: 2.52g / kg, chloride ion content: 13.7g / kg electroplating waste liquid at room temperature, after hydrogen peroxide oxidation and activated carbon filtration, and then through the pressure pump at a pressure of 0.6MPa, into the first filter for the second One time filtration, the filtration flow rate is 750L / h, the filtration flow rate is maintained, and the second filtration is performed through the second filter to obtain the filtered electroplating waste liquid.

[0068] Maintain the filtration flow rate. After the filtered electroplating waste liquid obtained in the above steps is adsorbed by the first resin column filled with 40% sulfonic acid group cation exchange resin and 55% amino anion exchange resin, a treatment waste liquid is obtained; Then the first-stage treatment waste liquid obt...

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Abstract

The invention provides a purification process of an electroplating waste liquid; the purification process comprises the following steps: firstly, filtering the electroplating waste liquid to obtain a filtered electroplating waste liquid; then adsorbing the filtered electroplating waste liquid obtained in the step one with a first resin column, to obtain a primary treated waste liquid; next adsorbing the primary treated waste liquid obtained in the step two with a second resin column, to obtain a secondary treated waste liquid; and finally, adsorbing the secondary treated waste liquid obtained in the step three with a third resin column, to obtain a purified waste bath liquid. Under conditions without heating, pressurization, drug adding or evaporation and the like, impurity ions in the electroplating waste chrome acid anhydride bath liquid are effectively removed, the recycling use standard is reached, recycling use is performed anew, the externally-discharged pollution is reduced, and a lot of raw material costs and pollutant treatment costs are saved.

Description

Technical field [0001] The invention belongs to the technical field of industrial sewage treatment, and particularly relates to a purification process of electroplating waste liquid. Background technique [0002] Electroplating refers to a surface processing method that uses the base metal to be plated as a cathode in a salt solution containing pre-plated metal to deposit the cations of the pre-plated metal in the plating solution on the surface of the base metal through electrolysis to form a plating layer. . The coating performance is different from the base metal and has new characteristics. According to the function of the coating, it is divided into protective coating, decorative coating and other functional coatings. As a basic industry in the industrial field, the electroplating industry has always been criticized as one of the most important sources of pollution. [0003] The basic raw materials for electroplating are zinc, nickel, copper, chromium, gold, silver and othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C25D21/16C02F103/16
CPCC02F1/001C02F1/42C02F1/72C02F1/722C02F1/78C02F9/00C02F2001/422C02F2001/425C02F2103/16C02F2301/08C25D21/16
Inventor 刘宏
Owner CHONGQING QINGTIAN ENVIRONMENTAL PROTECTION MATERIAL
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