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Treatment method of cyanide-containing electroplating waste water

A treatment method and technology for cyanide wastewater, which is applied in metallurgical wastewater treatment, multi-stage water treatment, degassed water/sewage treatment, etc., to achieve the effect of improving the stripping effect, increasing the removal rate, and reducing the effect of insoluble highly toxic cuprous cyanide

Inactive Publication Date: 2018-07-24
GUANGDONG XINDAYU ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in practical applications, it has been found that the insoluble and highly toxic cuprous cyanide produced in the acidification and stripping process of cyanide-containing wastewater has not been completely harmless. Therefore, the development and operation are simple and the environmental benefits are high, which can effectively reduce the stripping The treatment method of cyanide copper plating wastewater with the content of insoluble highly toxic substance cuprous cyanide produced in the process has important practical value

Method used

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  • Treatment method of cyanide-containing electroplating waste water

Examples

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Comparison scheme
Effect test

Embodiment 1

[0051] A treatment method for electroplating cyanide-containing wastewater, comprising the steps of:

[0052] (1) Isolate the electroplating cyanide-containing wastewater from the outside air, add dilute sulfuric acid for acidification treatment until the pH value is 4, convert the carbonate and bicarbonate in the electroplating cyanide-containing wastewater into carbonic acid, and then expose it by pressurization Gas, supplemented by stirring in the process of aeration, the diameter of the bubble is 0.1mm, the gas-liquid ratio is 1:100, and the volume percentage of carbon dioxide obtained is 80% gas I;

[0053] (2) Under the condition of isolating the air, add dilute sulfuric acid to the electroplating cyanide-containing wastewater to continue the acidification treatment until the pH is 1, then make the volume percentage of oxygen in the mixed gas be 0.1% after supplementing oxygen in the gas I, and use It performs gas-liquid countercurrent contact stripping in a stripping to...

Embodiment 2

[0056] A treatment method for electroplating cyanide-containing wastewater, such as figure 1 shown, including the following steps:

[0057] (1) Isolate the electroplating cyanide-containing wastewater from the outside air, add dilute sulfuric acid for acidification treatment until the pH value is 5, convert the carbonate and bicarbonate in the electroplating cyanide-containing wastewater into carbonic acid, and then expose it by pressurization Gas, supplemented by stirring in the process of aeration, the diameter of the bubbles is 6mm, the gas-liquid ratio is 1:300, and the volume percentage of carbon dioxide obtained is 65% gas I;

[0058] (2) Under the condition of isolating the air, adding dilute sulfuric acid to the electroplating cyanide-containing wastewater to continue the acidification treatment until the pH is 1, after supplementing oxygen in the gas I, the volume percentage of oxygen in the mixed gas is 15%. Gas-liquid countercurrent contact stripping is carried out...

Embodiment 3

[0062] A treatment method for electroplating cyanide-containing wastewater, comprising the steps of:

[0063] (1) Isolate the cyanide-containing wastewater in the open plating tank from the outside air in the cyanide-containing electroplating process, add dilute sulfuric acid for acidification treatment to a pH value of 3, and convert the carbonate and bicarbonate in the electroplating cyanide-containing wastewater It is carbonic acid, then aerated by pressurization, supplemented by stirring in the process of aeration, the diameter of the bubble is 1mm, the gas-liquid ratio is 1:150, and the volume percentage of carbon dioxide obtained is 70% gas I;

[0064] (2) Under the condition of isolating the air, adding dilute sulfuric acid to the electroplating cyanide-containing waste water and carrying out acidification treatment to pH is 3, and after supplementing oxygen in the gas I, the volume percentage of oxygen in the mixed gas is 6%. Gas-liquid countercurrent contact stripping...

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Abstract

The invention relates to a treatment method of cyanide-containing electroplating waste water. The treatment method comprises following steps: 1, cyanide-containing electroplating waste water is isolated from the external air, and is subjected to acidifying treatment so as to convert carbonates and / or bicarbonates in the cyanide-containing electroplating waste water into carbonic acid and / or carbondioxide, and aeration is carried out so as to obtain a gas I; 2, after aeration in step 1, the cyanide-containing electroplating waste water is subjected to secondary acidifying treatment, and oxygenis mixed with the gas I for air stripping, so that purified water and a gas II are obtained. Compared with conventional acidifying-air stripping, the treatment method is capable of reducing the amount of in-soluble highly toxic cuprous cyanide generated in air stripping process, and improving the air stripping effect of cyanides.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for treating cyanide in electroplating cyanide-containing wastewater. Background technique [0002] Cyanide copper plating technology was applied early and widely, and is still the main method of high-quality copper plating. In this method, the plating solution is mainly composed of copper cyanide complex and a certain amount of free cyanide, which is strongly alkaline. Because cyanide has a strong activation and complexing ability, the first feature of this electroplating method is that the solution has a certain degreasing and activation ability. Secondly, because this plating solution uses cyanide with strong complexing ability, the complex ion is not easy to discharge, so the cathodic polarization of the bath is very high, and it has excellent throwing ability and covering ability. During the electroplating cyanide copper plating process, the plated pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16
CPCC02F1/20C02F1/66C02F2103/16C02F2301/08
Inventor 麦建波江栋莫铭恩范远红刘恋曾宪灿覃贵福黎耀荣
Owner GUANGDONG XINDAYU ENVIRONMENTAL PROTECTION TECH CO LTD
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