Method for removing cyanide in wastewater by recycling electroplating sludge

A technology of electroplating sludge and cyanide, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve the problems of high cost and unfavorable long-term use, and the conditions are easy to control and the scope of application The effect of widening and simplifying the treatment process

Active Publication Date: 2014-04-09
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using this method to treat other cyanide-containing wastewater that does not contain heavy metals requires a large amount of additional chemicals, and the cost is too high, which is not conducive to long-term use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A method for removing cyanide in waste water by recycling electroplating sludge, the method specifically includes the following steps:

[0050] (1) Break the electroplating sludge into small particles with a particle size of 15mm or less, add water to the electroplating sludge according to the mass ratio of the electroplating sludge to water at 1:4, stir and mix to form a slurry; the electroplating sludge The molar ratio of divalent heavy metals to trivalent heavy metals is 2:1;

[0051] (2) Use sodium hydroxide solution to adjust the pH value of the slurry to 9, react in a constant temperature reactor under constant stirring, and introduce carbon dioxide into the solution, the reaction temperature is 1000°C, the pressure is 1MPa, and the reaction time is 24h. A reaction mixture is obtained, and the cooled reaction mixture is filtered and washed to obtain a hydrotalcite-like compound solid with a layered structure, which is used as an LDHs decyanation agent;

[0052] (...

Embodiment 2

[0056] A method for removing cyanide in waste water by recycling electroplating sludge, the method specifically includes the following steps:

[0057] (1) Break the electroplating sludge into small particles with a particle size of less than 15 mm, add water to the electroplating sludge according to the mass ratio of electroplating sludge to water of 1:6, stir and mix to form a slurry; the electroplating sludge The molar ratio of divalent heavy metals to trivalent heavy metals is 3:1;

[0058] (2) Use urea solution to adjust the pH value of the slurry to 9, react in a constant temperature reactor under constant stirring, pass carbon dioxide into the solution, the reaction temperature is 150°C, the pressure is 3MPa, and the reaction time is 8h, the reaction is obtained The mixture, the cooled reaction mixture is filtered and washed to obtain a hydrotalcite-like compound solid with a layered structure, which is used as an LDHs decyanation agent;

[0059] (3) Adjust the pH value...

Embodiment 3

[0063] A method for removing cyanide in waste water by recycling electroplating sludge, the method specifically includes the following steps:

[0064] (1) Break the electroplating sludge into small particles with a particle size of less than 15mm, add water to the electroplating sludge according to the mass ratio of electroplating sludge to water of 1:10, stir and mix to form a slurry; the electroplating sludge The molar ratio of divalent heavy metals to trivalent heavy metals is 4:1;

[0065] (2) Use urea solution to adjust the pH value of the slurry to 12, carry out the reaction under constant stirring in a constant temperature reactor, and introduce carbon dioxide into the solution, the reaction temperature is 80°C, the pressure is 1GPa, and the reaction time is 6h, and the reaction is obtained The mixture, the cooled reaction mixture is filtered and washed to obtain a hydrotalcite-like compound solid with a layered structure, which is used as an LDHs decyanation agent;

...

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Abstract

The invention relates to a method for removing cyanide in wastewater by recycling electroplating sludge, which comprises the following steps: controlling crystallization of heavy metal in electroplating sludge through a hydrothermal synthesis method, thus forming an LDHs (layered double hydroxides) laminated structure; regulating and controlling to replace the interlayer carbonate with cyanide so as to fix the cyanide into the LDHs laminated structure, thus achieving the purpose of wastewater decyanation; and finally, regenerating the LDHs decyanation agent through treatment. Compared with the prior art, the invention realizes recycling treatment of industrial waste electroplating sludge, so that environmental pollution is relieved, and the decyanation agent can be obtained to be used for in-situ wastewater decyanation, thus fully utilizing the waste and achieving the purpose of recycling. According to the method for performing decyanation through electroplating sludge treatment and performing regeneration, the treatment process is simplified, the conditions are easy to control, the application range is wide and the treatment effect is excellent.

Description

technical field [0001] The invention relates to a method for removing cyanide in waste water, in particular to a method for utilizing electroplating sludge as a resource to remove cyanide in waste water. Background technique [0002] Electroplating sludge is a solid waste produced during the electroplating wastewater treatment process, which contains a large amount of toxic heavy metals such as chromium, cadmium, copper, nickel, zinc, etc., and its composition is very complex. Electroplating sludge has the characteristics of high toxicity, easy accumulation, instability, and easy loss. If it is not properly treated and stacked randomly, it will cause serious secondary pollution and is a hazardous solid waste. [0003] There are many researches on electroplating sludge resource treatment process, but due to the complex composition of heavy metals in electroplating sludge, extracting various heavy metals one by one requires a long process, cumbersome operation, and high cost. ...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F101/18
CPCC02F11/10C02F1/281C02F2101/18C02F2103/16C02F2209/06Y02W10/40
Inventor 赵赫曹宏斌李玉平李海波
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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