CN107585929A - A kind of processing method of electroplating cyanic waste water - Google Patents
A kind of processing method of electroplating cyanic waste water Download PDFInfo
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- CN107585929A CN107585929A CN201711004063.4A CN201711004063A CN107585929A CN 107585929 A CN107585929 A CN 107585929A CN 201711004063 A CN201711004063 A CN 201711004063A CN 107585929 A CN107585929 A CN 107585929A
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- cyanide
- ozone
- bearing waste
- waste solution
- processing method
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Abstract
A kind of processing method of electroplating cyanic waste water, by the use of a kind of special oxide as catalyst, the reaction of ozone broken cyanide is set more rapidly and thoroughly to complete.The present invention is combined using electrolysis with Ozonation to be handled, treatment with electrolytic method has good removal effect and efficiency to the cyanide wastewater of higher concentration, its principle is that the simple cyanide included in cyanide wastewater passes through electrolysis with cooperation cyanide, chemical reaction is produced on anode and negative electrode, is carbon dioxide and nitrogen by cyanogen electrolytic oxidation；Ozone is strong oxidizer, and the free Cyanide in waste water and complex cyanide can be reacted.Ozone Oxidation Treatment is used to make the cyanide in waste water (with CN‑Meter) reach discharge standard, and ozone oxidation non-secondary pollution, sludge and odor smell are not produced, therefore the application has larger prospect.
Description
Technical field
The present invention relates to the technical field of wastewater treatment, and in particular to a kind of processing method of electroplating cyanic waste water.
Background technology
Cyanide bearing waste solution is mainly derived from electroplating work procedure containing cyanogen, contains cyanide and metal ion etc..Wherein cyanide belongs to
It extremely toxic substance, can be combined with the ferricytochrome enzyme in human body, it is lost the function of transmitting oxygen, so as to cause the asphyxia of people
It is dead.Metal ion is also that common are malicious pollutant, and water body, soil and biology are once difficult to by the pollution of metal ion
Remove, cause to seriously endanger to ecological environment and mankind itself.Also contain gold element in cyanide bearing waste solution, gold is mainly formed with cyanogen root
The form of complex ion is present.The processing method of existing cyanide bearing waste solution has many kinds, mainly includes：Acidization, alkaline chlorination process,
The multiple technologies such as electrolysis, Ozonation, hydrogen peroxide oxidation method, active carbon adsorption, membrane separation process, solvent extraction.
The content of the invention
A kind of processing method of electroplating cyanic waste water proposed by the present invention, by the use of a kind of special oxide as catalyst,
The reaction of ozone broken cyanide is set more rapidly and thoroughly to complete.
To achieve the above object, present invention employs following technical scheme：
A kind of processing method for electroplating cyanide bearing waste solution, comprises the following steps：
Step 1：Appropriate cyanide bearing waste solution is taken, is slowly added to sodium hydroxide solution thereto, is sufficiently stirred, and continues to examine
PH value change is surveyed, when pH is stable between 10.0~11.0, stopping adds sodium hydroxide；
Step 2：The cyanide bearing waste solution that pH has been adjusted in step 1 is placed in electrolytic cell, the anodic current density of electrolytic cell
Control is in 0.30~0.50A/dm2Between, according to the concentration of cyanide in cyanide bearing waste solution, electrolysis time is controlled in 0.5~2h；
Step 3：Liquid after the completion of being electrolysed in step 2 is taken out into filtering, reserved filtrate is standby；
Step 4：Filtrate in step 3 is taken, continuation is slowly added to a small amount of 30% sodium hydroxide solution, fully stirred thereto
Mix, and continue to detect pH value change, make pH stable 10.0~11.0, stop adding sodium hydroxide；
Step 5：Catalyst is added into the liquid after step 4 processing, dosage presses the matter of cyanide bearing waste solution and catalyst
Measure ratio 1：1~1：3；
Step 6：Ozone generator is opened, ozone Oxidation Treatment, the dosage of ozone are carried out to gained liquid in step 5
For：CN-：O3=1:4~1:7；
Step 7：Stop after the completion of ozone oxidation reaction is abundant, reacted solution is filtered, filtrate is after handling
Liquid up to standard, the solid after filtering are collected standby.
Further, the sodium hydroxide solution in the step 1 is 30% sodium hydroxide solution
Further, the final ph in the step 4 should be more bigger than pH in step 1.
Further, the step 5 also includes the abundant rinse catalysis of cyanide bearing waste solution that catalyst is added in preceding step 4
Agent.
As shown from the above technical solution, the present invention is combined using electrolysis with Ozonation is handled, electrolysis processing
Method has good removal effect and efficiency to the cyanide wastewater of higher concentration, and its principle is simple included in cyanide wastewater
Cyanide and cooperation cyanide produce chemical reaction on anode and negative electrode, are carbon dioxide by cyanogen electrolytic oxidation by electrolysis
And nitrogen；Ozone is strong oxidizer, and the free Cyanide in waste water and complex cyanide can be reacted.It can be made using ozone Oxidation Treatment
Cyanide in waste water is (with CN-Meter) reach discharge standard, and ozone oxidation non-secondary pollution, sludge is not produced and foreign odor is different
Taste, therefore larger prospect be present in the application；In addition, adding a kind of special oxide in this invention as catalyst, make
The reaction of ozone broken cyanide can be completed more rapidly and thoroughly.
As shown from the above technical solution, the present invention has advantages below：
1) technique is simple；Processing cost is low；Solve ozone and unconspicuous drawback is abolished to complex state cyanide；Condition temperature
With.
2) enable the effective qualified discharge of cyanide bearing waste solution, reduce the pollution to environment.
Embodiment
With reference to embodiment, the present invention will be further described：
Embodiment 1：
Take 5L cyanide bearing waste solutions to be placed in large beaker, be slowly added to 30% sodium hydroxide solution thereto, stirred with pole type
Device is sufficiently stirred, and continues to detect pH value change, when pH is stable 10.0, stops adding sodium hydroxide；Containing for pH will be adjusted
Cyanogen waste liquid is placed in electrolytic cell, and the anodic current density of electrolytic cell is controlled in 0.4A/dm2, and stop electrolysis after continuing 1h；By electricity
Liquid after the completion of solution takes out filtering；Filtrate is placed in large beaker, is slowly added to 30% sodium hydroxide solution thereto, is used vertical rod
Formula agitator is sufficiently stirred, and continues to detect pH value change, when pH is stable 10.2, stops adding sodium hydroxide；Again to beaker
Middle addition 1g is with the catalyst of the abundant rinse of cyanide bearing waste solution；Ozone generator is opened, micro porous aeration head is placed in large beaker,
Ozone Oxidation Treatment is carried out, the dosage of ozone is：CN-：O3=1：4；Stop after the completion of ozone oxidation reaction is abundant, will react
Solution filtering afterwards, filtrate are the liquid up to standard after handling.
Embodiment 2：
Take 5L cyanide bearing waste solutions to be placed in large beaker, be slowly added to 30% sodium hydroxide solution thereto, stirred with pole type
Device is sufficiently stirred, and continues to detect pH value change, when pH is stable 10.4, stops adding sodium hydroxide；Containing for pH will be adjusted
Cyanogen waste liquid is placed in electrolytic cell, and the anodic current density of electrolytic cell is controlled in 0.5A/dm2, and stop electrolysis after continuing 1.5h；Will
Liquid after the completion of electrolysis takes out filtering；Filtrate is placed in large beaker, is slowly added to 30% sodium hydroxide solution thereto, with vertical
Rod stirrer is sufficiently stirred, and continues to detect pH value change, when pH is stable 10.5, stops adding sodium hydroxide；Again to burning
Catalyst of the 1.2g with the abundant rinse of cyanide bearing waste solution is added in cup；Ozone generator is opened, micro porous aeration head is placed in big burning
In cup, ozone Oxidation Treatment is carried out, the dosage of ozone is：CN-：O3=1：4.8；Stop after the completion of ozone oxidation reaction is abundant,
Reacted solution is filtered, filtrate is the liquid up to standard after handling.
Embodiment 3：
Take 5L cyanide bearing waste solutions to be placed in large beaker, be slowly added to 30% sodium hydroxide solution thereto, stirred with pole type
Device is sufficiently stirred, and continues to detect pH value change, when pH is stable 10.5, stops adding sodium hydroxide；Containing for pH will be adjusted
Cyanogen waste liquid is placed in electrolytic cell, and the anodic current density of electrolytic cell is controlled in 0.5A/dm2, and stop electrolysis after continuing 1.8h；Will
Liquid after the completion of electrolysis takes out filtering；Filtrate is placed in large beaker, is slowly added to 30% sodium hydroxide solution thereto, with vertical
Rod stirrer is sufficiently stirred, and continues to detect pH value change, when pH is stable 10.8, stops adding sodium hydroxide；Again to burning
Catalyst of the 2.0g with the abundant rinse of cyanide bearing waste solution is added in cup；Ozone generator is opened, micro porous aeration head is placed in big burning
In cup, ozone Oxidation Treatment is carried out, the dosage of ozone is：CN-：O3=1：6；Stop after the completion of ozone oxidation reaction is abundant, will
Reacted solution filtering, filtrate are the liquid up to standard after handling.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
Enclose and be defined, on the premise of design spirit of the present invention is not departed from, technical side of the those of ordinary skill in the art to the present invention
The various modifications and improvement that case is made, all should fall within the scope of protection of the present invention.
Claims (7)
- A kind of 1. processing method for electroplating cyanide bearing waste solution, it is characterised in that：Comprise the following steps：Step 1：Appropriate cyanide bearing waste solution is taken, is slowly added to sodium hydroxide solution thereto, is sufficiently stirred, and continues to detect pH Value changes, when pH is stable between 10.0~11.0, stopping adds sodium hydroxide；Step 2：The cyanide bearing waste solution that pH has been adjusted in step 1 is placed in electrolytic cell, the anodic current density control of electrolytic cell In 0.30~0.50A/dm2Between, according to the concentration of cyanide in cyanide bearing waste solution, electrolysis time is controlled in 0.5~2h；Step 3：Liquid after the completion of being electrolysed in step 2 is taken out into filtering, reserved filtrate is standby；Step 4：Filtrate in step 3 is taken, continuation is slowly added to a small amount of 30% sodium hydroxide solution, is sufficiently stirred thereto, and PH value change is persistently detected, makes pH stable 10.0~11.0, stops adding sodium hydroxide；Step 5：Catalyst is added into the liquid after step 4 processing, dosage is by cyanide bearing waste solution and the mass ratio of catalyst 1：1~1：3；Step 6：Ozone generator is opened, ozone Oxidation Treatment is carried out to gained liquid in step 5, the dosage of ozone is： CN-：O3=1:4~1:7；Step 7：Stop after the completion of ozone oxidation reaction is abundant, reacted solution is filtered, filtrate is up to standard after handling Liquid, the solid after filtering are collected standby.
- A kind of 2. processing method for electroplating cyanide bearing waste solution according to claim 1, it is characterised in that：In the step 1 Sodium hydroxide solution is 30% sodium hydroxide solution.
- A kind of 3. processing method for electroplating cyanide bearing waste solution according to claim 2, it is characterised in that：In the step 4 Final ph should be more bigger than pH in step 1.
- A kind of 4. processing method for electroplating cyanide bearing waste solution according to claim 3, it is characterised in that：The step 5 is also wrapped Include the abundant rinse catalyst of cyanide bearing waste solution that catalyst is added in preceding step 4.
- A kind of 5. processing method for electroplating cyanide bearing waste solution according to claim 4, it is characterised in that：The pH of the step 1 It is worth for 10.0；The anodic current density of the electrolytic cell of the step 2 is controlled in 0.4A/dm2, and stop electrolysis after continuing 1h；Institute The pH value for stating step 4 is 10.2；The dosage of the ozone of the step 6 is：CN-：O3=1：4.
- A kind of 6. processing method for electroplating cyanide bearing waste solution according to claim 4, it is characterised in that：The pH of the step 1 It is worth for 10.4；The anodic current density of the electrolytic cell of the step 2 is controlled in 0.5A/dm2, and stop electrolysis after continuing 1.5h； The pH value of the step 4 is 10.5；The dosage of the ozone of the step 6 is：CN-：O3=1：4.8.
- A kind of 7. processing method for electroplating cyanide bearing waste solution according to claim 4, it is characterised in that：The pH of the step 1 It is worth for 10.5；The anodic current density of the electrolytic cell of the step 2 is controlled in 0.5A/dm2, and stop electrolysis after continuing 1.8h； The pH value of the step 4 is 10.8；The dosage of the ozone of the step 6 is：CN-：O3=1：6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711004063.4A CN107585929A (en) | 2017-10-24 | 2017-10-24 | A kind of processing method of electroplating cyanic waste water |
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| CN201711004063.4A CN107585929A (en) | 2017-10-24 | 2017-10-24 | A kind of processing method of electroplating cyanic waste water |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1562793A (en) * | 2004-03-17 | 2005-01-12 | 四川师范大学 | Method for treating wastewater containing cyanogen |
| CN103951017A (en) * | 2014-05-05 | 2014-07-30 | 浙江师范大学 | Method for treating cyanogen-containing copper-containing electroplating wastewater by electrolysis and recycling copper |
| CN104108782A (en) * | 2014-03-03 | 2014-10-22 | 福建省双旗山矿业有限责任公司 | Ozone decyanation technology |
| CN104129875A (en) * | 2014-08-16 | 2014-11-05 | 长春黄金研究院 | Cyanated wastewater treatment method |
-
2017
- 2017-10-24 CN CN201711004063.4A patent/CN107585929A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1562793A (en) * | 2004-03-17 | 2005-01-12 | 四川师范大学 | Method for treating wastewater containing cyanogen |
| CN104108782A (en) * | 2014-03-03 | 2014-10-22 | 福建省双旗山矿业有限责任公司 | Ozone decyanation technology |
| CN103951017A (en) * | 2014-05-05 | 2014-07-30 | 浙江师范大学 | Method for treating cyanogen-containing copper-containing electroplating wastewater by electrolysis and recycling copper |
| CN104129875A (en) * | 2014-08-16 | 2014-11-05 | 长春黄金研究院 | Cyanated wastewater treatment method |
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Application publication date: 20180116 |