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Treatment method of potassium chloride cadmium cobalt alloy electroplating wastewater

A technology for electroplating wastewater and treatment methods, which is applied in metallurgical wastewater treatment, oxidized water/sewage treatment, water/sewage treatment, etc., can solve problems such as excessive cadmium content, achieve low treatment costs, good application prospects, and eliminate secondary pollution Effect

Active Publication Date: 2022-04-01
GUANGZHOU ULTRA UNION CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But use this method to treat potassium chloride cadmium-cobalt alloy electroplating wastewater, the content of cadmium after treatment obviously exceeds the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1: process potassium chloride cadmium cobalt alloy electroplating rinse water

[0054] The present embodiment provides the processing method of potassium chloride cadmium cobalt alloy electroplating rinse water, contains cadmium ion 400mg / L, nitrilotriacetic acid and other carboxylic acid complexing agents 3000mg / L in the waste water, comprises the following steps:

[0055] Step 1. Precipitate heavy metals and complexing agents

[0056] The wastewater is transported from the potassium chloride cadmium cobalt alloy electroplating wastewater regulating tank to the ferrous feeding tank. Under mechanical stirring, 60L of ferrous chloride solution is added to each ton of wastewater, and dilute hydrochloric acid is added to adjust the pH to 4-5.

[0057] The wastewater flows from the ferrous feeding tank into the sedimentation tank A, and the lime emulsion is added under mechanical stirring until the pH is 10-12. The ferrous ions and calcium ions form precipitates ...

Embodiment 2

[0073] Example 2: Treatment of potassium chloride cadmium cobalt alloy electroplating and low chromium hexavalent chromium passivation mixed wastewater

[0074] This embodiment provides the processing method of potassium chloride cadmium cobalt alloy electroplating rinse water and passivation rinse water, cadmium ion 200mg / L, ammonia triacetic acid and other carboxylic acid complexing agents 1500mg / L, hexavalent chromium 30mg / L in the waste water , Trivalent chromium 20mg / L, including the following steps:

[0075] Step 1. Precipitate heavy metals and complexing agents

[0076] The wastewater is transported from the potassium chloride cadmium cobalt alloy electroplating wastewater regulating tank to the ferrous feeding tank, and under mechanical stirring, 30L of ferrous chloride solution is added to each ton of wastewater.

[0077] The waste water flows into the sedimentation tank A from the ferrous feeding tank, and the lime emulsion is added under mechanical stirring until t...

Embodiment 3

[0093] Embodiment 3: processing potassium chloride cadmium cobalt alloy electroplating and chromic acid passivation mixed waste water

[0094] This embodiment provides the processing method of potassium chloride cadmium cobalt alloy electroplating rinse water and passivation rinse water, cadmium ion 200mg / L, ammonia triacetic acid and other carboxylic acid complexing agents 1500mg / L, hexavalent chromium 500mg / L in the waste water , Trivalent chromium 50mg / L, including the following steps:

[0095] Step 1. Precipitate heavy metals and complexing agents

[0096] The wastewater is transported from the potassium chloride cadmium cobalt alloy electroplating wastewater regulating tank to the ferrous feeding tank, and under mechanical stirring, 70L of ferrous chloride solution is added to each ton of wastewater.

[0097] The waste water flows into the sedimentation tank A from the ferrous feeding tank, and the lime emulsion is added under mechanical stirring until the pH is 10-12. ...

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Abstract

The invention provides a treatment method for potassium chloride cadmium cobalt alloy electroplating wastewater, adding ferrous chloride to the wastewater, adjusting the pH to 10-12 with lime emulsion, and using ferrous ions and calcium ions to synergistically precipitate carboxylic acid coordination agent, hexavalent chromium is reduced to trivalent chromium by ferrous ions, and cadmium ions, cobalt ions and trivalent chromium ions form hydroxide precipitates. Filter and separate the precipitate, add sodium dimethyl dithiocarbamate to the waste water to precipitate residual cadmium ions, cobalt ions and trivalent chromium ions, add ferrous chloride and adjust the pH to 10-12 with lime emulsion, ferrous ions Co-precipitate residual carboxylic acid complexing agent with calcium ions, while ferrous ions precipitate excess sodium dimethyl dithiocarbamate. Add sodium hypochlorite to waste water to destroy other organic matter and adjust the pH to 6-9. The technical scheme of the invention can effectively remove heavy metal ions, complexing agents and other organic matter in electroplating wastewater of potassium chloride, cadmium and cobalt alloys, and the treatment result meets the requirements of the discharge standard of electroplating pollutants.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a treatment method for electroplating wastewater of potassium chloride, cadmium and cobalt alloys. Background technique [0002] The Chinese invention patent "A Potassium Chloride-Cadmium-Cobalt Alloy Plating Solution, Its Preparation Method and Electroplating Process" with the application announcement number "CN 110079842 A" discloses a potassium chloride-cadmium-cobalt alloy plating solution, which contains cadmium chloride , cobalt chloride, nitrilotriacetic acid and other complexing agents, brighteners, auxiliary agents, and moving agents. Nitrilotriacetic acid has strong oxidation resistance, and conventional oxidation methods cannot effectively destroy nitrilotriacetic acid. After oxidation, some heavy metals still exist in the form of complex ions in wastewater, and the treatment results seriously exceed the standard. [0003] The Chine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/20C02F101/22C02F103/16
CPCC02F1/66C02F1/5245C02F1/56C02F1/76C02F1/54C02F2101/20C02F2101/22C02F2103/16
Inventor 郭崇武李小花陈康赖奂汶
Owner GUANGZHOU ULTRA UNION CHEM LTD