Method for treating complexed chemical nickel electroplating wastewater

A technology for electroplating wastewater and treatment methods, applied in metallurgical wastewater treatment, oxidized water/sewage treatment, etc., can solve the problems of long reaction time, high operating cost, low current efficiency, etc., reduce investment and operating costs, and meet discharge requirements , high processing efficiency

Inactive Publication Date: 2014-06-04
陈瀚翔
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used methods for breaking the network are: (1) Fenton oxidation method for breaking the network. The disadvantage of this method is that under acidic conditions, the amount of sludge produced is large and the operating cost is high.
(2) The NaClO oxidation method breaks the complex. The disadvantage of this method is that the reaction time is long and it is easily affected by the temperature. Detrimental effects on the network breaking process
(3) Electro-Fenton method, the improved third type of electro-Fenton method still has the disadvantages of difficult sludge separation, high acid consumption for electrolytic reduction, low current efficiency, complex and uneconomical operation process, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (2) Polytes aluminum (PAC) with a concentration of 5%of the plus concentration of 5%mix for 8 minutes, add 5 ‰ polyacrylamide (PAM) 2ml mixing for 8 minutes, and then stand for 15 minutes.) The sediment formed in the formation is removed by the precipitation of the concrete, and the upper liquid enters the follow -up process;

[0022] (3) Add a sulfuric acid with a concentration of 30%in the upper liquid of the step (2) to the pH of 30%to 4.5, mix and stir for 15 minutes;

[0023] (4) In the solution of the step (3) pH adjustment, add 800mg of high -speed potassium, mix and stir for 40 minutes.Nickel ion becomes free state, which is convenient for subsequent alkali to form nickel hydroxide, which is removed by precipitation;

[0024] (5) In the solution after the step (4) mixing and stirring, add the pH of calcium hydroxide to 10.5, and mix it for 40 minutes.After the oxidation of high -speed rail acid root ions, the three -price iron ions with excellent flocculation functi...

Embodiment 2

[0028] In the 2L burn, add calcium hydroxide to adjust the wastewater pH to 8, mix and stir for 20 minutes;

[0029] (2) Polyte aluminum (PAC) with a concentration of 5%of the concentration of 5%mixing for 5 minutes, and then add 5 ‰

[0030] The polyacrylamide (PAM) is mixed with 0.5ml mixed and stirred for 5 minutes, and then settled for 10 minutes;

[0031] (3) Pour the upper liquid into the other 2L toast and add a sulfuric acid regulating solution with a concentration of 30%to 4,

[0032] Mixing and stirring for 10 minutes;

[0033] (4) Add 200mg of high -speed potassium, mix and stir for 30 minutes;

[0034] (5) After mixing and stirring, add calcium hydroxide to adjust the pH of the wastewater to 10, while mixing and stirring 30

[0035] minute;

[0036] (6) Add the concentration to 5 ‰ polyacrylamide (PAM) 0.5ml for a concrete reaction, mix and stir 10

[0037]In minutes, the formed nickel hydroxide sediment was removed by the concrete reactions. The final two -valent nick...

Embodiment 3

[0040] In the 2L burn, add calcium hydroxide to adjust the waste water to 9, mix and stir for 30 minutes;

[0041] (2) Polytes aluminum (PAC) with a concentration of 5%bleeding at 8ml mixed and stirred for 10 minutes, and then add 5 ‰

[0042] Polyacrylamide (PAM) 2ml mixes for 10 minutes, and then rests for 20 minutes;

[0043] (3) Pour the upper liquid into the other 2L toast and add a sulfuric acid regulating solution with a concentration of 30%to 5.0.

[0044] Mix and stir for 20 minutes;

[0045] (4) Add 500mg of high -speed potassium, mix and stir for 45 minutes;

[0046] (5) After mixing and stirring, add calcium hydroxide to adjust the pH of the wastewater to 11, while mixing and stirring 45

[0047] minute;

[0048] (6) Add concentration to 5 ‰ polyacrylamide (PAM) 2ml for a concrete reaction, mix and stir for 20 minutes,

[0049] The formed nickel hydroxide sediment is removed by the concrete reaction. The final nickel concentration of the second price is 0.30mg / L, which...

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PUM

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Abstract

The invention provides a method for treating complexed chemical nickel electroplating wastewater and aims at the problem in the existing complexed chemical nickel electroplating wastewater treatment processes that the nickel ion removal efficiency is inadequate. The method comprises the main processes of firstly adding calcium hydroxide into the wastewater, adjusting the pH to 8-9 so as to form calcium phosphate precipitates, adding sulfuric acid into a supernatant liquid so as to adjust the pH of the liquid to 4-5, then, adding a potassium ferrate liquid with strong oxidizing power so as to decomplex in a strong oxidizing manner and change complexed nickel ions into free-state nickel ions, then, adding calcium hydroxide, adjusting the pH to 10-11 so as to enable the free-state nickel ions to form precipitates to be removed from the wastewater, enabling trivalent ferric ions with excellent flocculation function generated after oxidation of ferric acid radical ions to have flocculation with hydroxide precipitates with an adsorption effect, and finally, adding polyacrylamide (PAM) to coagulate and precipitate, thereby removing nickel ions from the electroplating wastewater. The method has the advantages that the condition that the nickel ions obtained after the complexed chemical nickel electroplating wastewater is treated reach the national standards can be effectively guaranteed, the treatment efficiency is high, and the requirements on emission are met.

Description

Technical field [0001] The present invention is a method of electroplating wastewater treatment technology, especially the treatment method involving a chemical nickel electroplated wastewater. Background technique [0002] In the past half a century, the application of electroplating technology in mechanical manufacturing, light industry, electronic industrial aerospace, and instruments has become more and more widely developed, bringing rapid development to the world economy. However, the electroplating wastewater generated by the process has become the worldOne of the three major pollution sources.Electroplating wastewater comes from the wastewater produced by electroplating waste liquid, grinding water, pickling wastewater, alkaline -washing oil wastewater, flushing floor and brushing polar plate.Specific pollution includes pollution of oil -containing wastewater, pollution of acid -base copper nickel wastewater, pollution of chromium -containing wastewater, pollution of cyan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F103/16
Inventor 陈瀚翔
Owner 陈瀚翔
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