Green multi-metal cooperation stabilization agent for fly ash and application method for green multi-metal cooperation stabilization agent

A composite stabilizer and fly ash technology, which is applied in the restoration of polluted soil and the removal of solid waste, can solve the problems of difficulty in fixing multiple metals at the same time with a single agent, reducing the dosage of chemicals, and adding a large amount of chelating agents. Achieve significant environmental and social benefits, reduce environmental costs and costs, and reduce processes

Inactive Publication Date: 2015-12-23
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One of the purposes of the present invention is to overcome the many deficiencies in the single use of existing stabilizing agents, such as the large amount of chelating agent added, poor acid resistance, and the difficulty of fixing multiple metals at the same time with a single agent, and propose a composite fixing agent and The method of use can simultaneously fix various heavy metals such as cadmium, lead, zinc, chromium, and ni

Method used

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  • Green multi-metal cooperation stabilization agent for fly ash and application method for green multi-metal cooperation stabilization agent
  • Green multi-metal cooperation stabilization agent for fly ash and application method for green multi-metal cooperation stabilization agent
  • Green multi-metal cooperation stabilization agent for fly ash and application method for green multi-metal cooperation stabilization agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0028] The incineration fly ash used in this embodiment is the domestic waste incineration fly ash of a waste incineration plant in Southwest my country. The components of fly ash were determined according to USEPA3050, and the results are shown in Table 1.

[0029] Table 1 The main components of fly ash

[0030] Composition

Mass percentage (%)

SiO 2

49.51

Fe 2 o 3

9.66

Al 2 o 3

7.52

CaO

13.74

SO 3

9.2

Na 2 o

5.11

TiO 2

5.26

[0031] It can be seen from Table 1 that the main components of fly ash are Si, Fe, Al, Ca, S, Na, Ti.

[0032] The main heavy metal content of fly ash was digested and determined by ASTMD6357-00a digestion method, and the leaching toxicity was determined by "Solid waste leaching toxicity leaching method acetic acid buffer solution method" (HJ / T300-2007). The results are shown in Table 2.

[0033] Table 2 Content and leaching concentration of ...

Embodiment example 2

[0042] The incineration fly ash used in this example is the domestic waste incineration fly ash of a waste incineration plant in central China. The fly ash group was determined according to USEPA3050, and the results are shown in Table 4.

[0043] Table 4 Main components of fly ash

[0044] Composition

Mass percentage (%)

SiO 2

54.03

Fe 2 o 3

8.62

Al 2 o 3

5.11

CaO

11.24

Na 2 o

9.77

K 2 o

4.38

MgO

6.85

[0045] The main heavy metal content of fly ash was digested and determined by ASTM D6357-00a digestion method, and the leaching toxicity was determined by "Solid waste leaching toxicity leaching method acetic acid buffer solution method" (HJ / T300-2007). The results are shown in Table 5.

[0046] Table 5 Content and leaching concentration of heavy metals in fly ash

[0047]

[0048] It can be seen from Table 5 that Cd and Pb are excessive pollutants in fly ash, a...

Embodiment example 3

[0055] The incineration fly ash used in this embodiment is the domestic waste incineration fly ash of a waste incineration plant in South China. The fly ash group was determined according to USEPA3050, and the results are shown in Table 7.

[0056] Table 7 Main components of fly ash

[0057] Composition

Mass percentage (%)

SiO 2

42.58

Fe 2 o 3

8.96

al 2 o 3

9.88

CaO

18.23

MgO

4.20

Na 2 o

6.00

K 2 o

10.15

[0058] The main heavy metal content of fly ash was digested and determined by ASTM D6357-00a digestion method, and the leaching toxicity was determined by "Solid Waste Leaching Toxicity Leaching Method Acetic Acid Buffer Solution Method" (HJ / T300-2007). The results are shown in Table 8.

[0059] Table 8 Content and leaching concentration of heavy metals in fly ash

[0060]

[0061]

[0062] It can be seen from Table 8 that Cd, Pb, Cu, and Cr are excessive p...

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Abstract

The invention belongs to the field of dangerous waste stabilizing treatment, relates to a method for treating incineration fly ash by mixing diethyl dithiocarbamate carbamate and ferrous sulfate (copperas) in a certain proportion as a stabilization agent, and provides a method for treating multiple kinds of heavy metal in incineration fly ash by mixing diethyl dithiocarbamate carbamate, phosphate and copperas in a certain proportion as an agent to solve the problems that in single use of an existing stabilization agent, many defects exists, for example, a chelating agent is high in use level, cost is high, and multiple kinds of metal are not likely to be fixed by single agents at the same time. According to the method, multiple kinds of heavy metal such as cadmium, lead, zinc and nickel in the incineration fly ash can be fixed at the same time, and therefore the leaching toxicity of the heavy metal is lowered, and the requirement of the Municipal Solid Waste Landfill Contamination Control Standard (GB16889-2008) is met. In addition, the method is low in cost, raw materials are easy to obtain, secondary pollution is avoided, and the treatment method is simple. The simple and feasible method for stabilizing treatment on household refuse incineration fly ash is provided, a great obstacle of restraining the cleanliness development of waste incineration enterprises is eliminated, great environment benefits can be achieved, and obvious economic benefits and good social benefits can be achieved.

Description

technical field [0001] The invention belongs to the field of chemical stabilization treatment of hazardous waste, and in particular relates to the application of a compound agent as an environmentally friendly agent for stabilizing heavy metals in waste incineration fly ash. Background technique [0002] With the development of my country's social economy and the improvement of people's material living standards, the amount of municipal solid waste continues to grow at a rate of 8%-10% per year. Great difficulty came. The basic disposal methods of MSW include landfill, incineration and composting. Among them, the incineration method can reduce the volume of garbage by 90%, and reduce the volume by 75%. The heat energy generated can be recycled, and it can maximize the reduction, harmlessness, and recycling of domestic garbage, and it occupies the least land resources. [0003] Fly ash refers to the substances collected in the heat recovery system and flue gas purification s...

Claims

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Application Information

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IPC IPC(8): B09C1/08B09B3/00A62D3/33A62D101/08
Inventor 林爱军孙杨雨赵越邹德勋
Owner BEIJING UNIV OF CHEM TECH
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