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Stable heavy metal chelating agent and use method thereof

A heavy metal chelating agent and heavy metal technology, which is applied in the direction of protection devices against harmful chemicals, etc., can solve the problems of multi-time cleaning equipment, secondary pollution, and the re-dissolution of heavy metals in cement solidification, so as to reduce the dissolution of heavy metals and add Small amount, good practical effect

Inactive Publication Date: 2010-02-10
SHANGHAI SUS ENVIRONMENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the curing of cement is simple and cheap, there is a risk of secondary pollution caused by the redissolution of heavy metals in the cement solidified product.
In addition, the cement itself will also solidify, and scale will form on the mixing equipment and conveying equipment, requiring more time to clean the equipment

Method used

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  • Stable heavy metal chelating agent and use method thereof
  • Stable heavy metal chelating agent and use method thereof
  • Stable heavy metal chelating agent and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] ① Add 10g of incineration fly ash to a 4-necked flask with good airtightness equipped with a stirring device, and stir;

[0024] ② When the temperature in the flask rises to 80°C, add 1.5 g of p-diazepine (or aminoethyl p-diazepine);

[0025] ③Blow in dry air from the inlet on one side of the flask with a flow rate of 200ml / min, and collect the escaped gas from the outlet on the other side of the flask for 15 minutes with a collection volume of 3L;

[0026] ④ Determination of carbon disulfide (CS) in the collected gas with a direct-reading gas detector 2 ), hydrogen sulfide (H 2 S) concentration.

Embodiment 2

[0036] ① Weigh 100g of incineration fly ash and place it in a beaker;

[0037] ②Add water, p-diazepine (or aminoethyl p-diazepine), and stir for 10 minutes;

[0038] ③Use the acetic acid buffer solution method to leach and determine the leaching concentration of heavy metal lead.

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Abstract

The invention relates to a stable heavy metal chelating agent and an use method thereof. The effective ingredient of the stable heavy metal chelating agent is annular polyamine compound containing piperazin or aminoethylpiperazin. A small amount of heavy metal chelating agent can be added in substances to be treated and mixed evenly to form complex of heavy metal with stable chemical property andcan be used to treat waste material or waste liquor with heavy metal, in particular to powdery or adhesive substances with heavy metal such as incineration fly ash, slag, soil, sludge and the like, thus realizing stabilization of heavy metal and reducing the heavy metal release. Compared with other stabilization methods of heavy metal, the heavy metal chelating agent is characterized by less additive amount, no harmful gas product, high degree of stabilization and the like, has stronger practicability and is applicable to substances with heavy metal such as incineration fly ash, slag, soil, sludge and the like.

Description

technical field [0001] The invention belongs to the field of hazardous waste treatment and disposal, and relates to a chelating agent for treating hazardous waste containing heavy metals and a use method thereof, which can stabilize heavy metals and reduce the leaching amount of heavy metals. Background technique [0002] Industrial waste and wastewater, waste incineration fly ash, slag, sludge, polluted soil, etc. contain heavy metals such as mercury, cadmium, lead, chromium, arsenic, selenium, etc. that are harmful to human body. If they are directly discharged or landfilled, they will pollute The surrounding environment, especially lead, cadmium and mercury, will dissolve with precipitation, polluting surface water and groundwater. At present, one way is to use cement to solidify the hazardous waste containing heavy metals, and then landfill it in the garbage disposal site. Although cement solidification is simple and cheap, there is a risk of secondary pollution caused ...

Claims

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Application Information

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IPC IPC(8): A62D3/33A62D101/43
Inventor 龙吉生朱晓平白力邓小福梁怡侃瞿兆舟李军川岛正毅藤本秀夫
Owner SHANGHAI SUS ENVIRONMENT
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