Preparation method and application of heavy metal chelating agent

A heavy metal chelating agent and chelating agent technology, applied in the field of fly ash treatment, can solve the problems of deviation of lead treatment effect, high cost of chemicals, deviation of nickel effect, etc., so as to improve the operation safety, improve the working environment, and prevent the overflow of ammonia. Effect

Pending Publication Date: 2017-11-24
WUHAN QIANGFENG XINTE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, inorganic phosphate chelating agents cannot meet the requirements of GB16889-2008 "Standards for Pollution Control of Domestic Waste Landfill Sites"; pure sodium dimethyl dithiocarbamate chelating agents are effective in treating incineration sludge fly ash and high ammonia nitrogen concentration fly ash Poor and high dosage; trisodium thiocyanate chelating agent has a deviation in the effect on nickel and has a deviation in the relative chelating abil...

Method used

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  • Preparation method and application of heavy metal chelating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Add 450kg of reaction bottom water into the reaction kettle, stir and add 421kg of dimethyl dithiocarbamate, adjust the temperature to 40°C, and stir for 2 hours.

[0024] (2) Slowly add 100 kg of sodium formate solution dropwise, control the pH value to 9, add dropwise for 0.5 hour, and stir steadily for 1 hour.

[0025] (3) Slowly add 50 kg of hydrazine hydrate solution dropwise, stir and keep warm for 2 hours.

[0026] (4) Cool down, check the content, the solid content is 40.7%, and the pH is 10.45.

Embodiment 2

[0028] (1) Add 500kg of reaction bottom water into the reaction kettle, stir and add 452kg of diethyldithiocarbamate, adjust the temperature to 50°C, and stir for 2 hours.

[0029] (2) Slowly add 50 kg of sodium gluconate solution dropwise, and stir and keep warm for 5 hours.

[0030] (3) Slowly add 20 kg of thiourea solution dropwise, control the pH value to 10.5, add dropwise for 2 hours, and stir steadily for 3 hours.

[0031] (4) Cool down, check the content, the solid content is 44.2%, and the pH is 10.50.

Embodiment 3

[0033] (1) Add 400kg of reaction bottom water into the reaction kettle, stir and add 421kg of ureidene dithiocarbamate, adjust the temperature to 55°C, and stir for 1 hour.

[0034] (2) Slowly add 100 kg of disodium phosphate solution dropwise, control the pH value to 9.5, add dropwise for 1.5 hours, and stir steadily for 2 hours.

[0035] (3) Slowly add 30 kg of carbazide solution dropwise, stir and keep warm for 3 hours.

[0036] (4) Cool down, check the content, the solid content is 41.2%, and the pH is 10.34.

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Abstract

The invention discloses a preparation method and application of a heavy metal chelating agent and belongs to the field of fly ash treatment. The chelating agent is prepared from dithiocarbamtes, weak acid salt, organic amine and water. The PH of a prepared chelating agent solution is smaller than 10.5, the chelating speed of the chelating agent solution and lead can be effectively increased, and the reaction speeds of the chelating agent solution and copper as well as the chelating agent solution and iron are properly decreased. Through the chelating agent, the influence of the high ammonia-nitrogen values of fly ash on the chelating capacity of the chelating agent can be effectively improved, and when the chelating agent is used in the sludge fly ash, the chelating capacity of the chelating agent is not lowered.

Description

technical field [0001] The invention relates to the field of fly ash treatment, in particular to a preparation method and application of a composite chelating agent for treating fly ash. Background technique [0002] The incineration of garbage produces a large amount of fly ash containing heavy metals, which greatly exceeds the sanitary landfill standard and becomes hazardous waste, which is extremely harmful to humans and the environment. Therefore, it is necessary to stabilize the heavy metals in the fly ash, so that it can meet the landfill standard or be used for subsequent resource utilization. [0003] At present, my country's waste incineration power plants basically purchase ammonia water or urea SNCR denitrification technology. The actual denitrification rate of the power plant is about 50%, which is controlled by the NOX emission index. On the one hand, a large amount of excessive ammonia is adsorbed in the pore structure of fly ash; on the other hand, excessive a...

Claims

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Application Information

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IPC IPC(8): A62D3/33B09B3/00A62D101/08
CPCA62D3/33B09B3/00A62D2101/08B09B2101/30
Inventor 颜丁
Owner WUHAN QIANGFENG XINTE TECH
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