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Curing agent and curing method for heavy metals in fly ash from mswi (municipal solid waste incineration)

A technology of waste incineration fly ash and solidification method, which is applied in the direction of protection devices against harmful chemicals, etc., can solve the problems of losing the advantage of low price, energy consumption, environmental pollution, etc., and achieve the effect of harmless treatment

Inactive Publication Date: 2017-02-08
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, Portland cement is still the most widely used curing substrate for the harmless treatment of waste incineration fly ash. It undergoes hydration reaction to form a hard solid, and stabilizes heavy metal pollutants through physical encapsulation and chemical cementation, but the main A large amount of clinker will cause direct energy consumption and indirect environmental pollution. In addition, as laws and regulations require higher and higher leaching concentrations of heavy metal solidified bodies, the amount of cement used to solidify pollutants will also increase greatly. , making it lose the advantage of cheap

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The object of treatment is the waste incineration fly ash mixture at different periods during the normal operation of a waste incineration power plant in Guangzhou. It is light gray in color, contains 44.31% calcium, 21.74% chlorine, and 9.45% sulfur. The heavy metals lead (22.47mg / L), cadmium (3.32mg / L) and zinc (108.73mg / L) in the fly ash exceeded the threshold seriously.

[0029] The waste incineration fly ash heavy metal curing agent and curing method provided by the present invention are used to treat the above waste incineration fly ash, wherein the aluminum-rich high-silicon material is hydrated blast furnace slag, fly ash, silica powder and aluminate from a factory in Wuhan The mixture of cement, after mechanical grinding, the total content of silicon and aluminum in the aluminum-rich and high-silicon material is 67% through component testing, the ratio of silicon and aluminum is 1:1.5, and the specific surface area of ​​the aluminum-rich and high-silicon materia...

Embodiment 2

[0033] The object of treatment is fly ash from a waste incineration power plant in Wuhan, which contains 39.31% calcium, 19.74% chlorine and 12.45% sulfur. The TCLP leaching concentrations of chromium, arsenic and lead exceed the threshold (8.23mg / L, 5.32mg / L and 11.33mg / L).

[0034] The waste incineration fly ash heavy metal curing agent and solidification method provided by the present invention are used to treat the above waste incineration fly ash, wherein the aluminum-rich and high-silicon material is taken from hydrated blast furnace slag and fluidized bed fly ash from a factory in Wuhan, which is relatively old The mixture of soil and red mud, after mechanical grinding, the silicon-aluminum ratio is 1:1.32, the total silicon-aluminum content is 75%, and the specific surface area of ​​aluminum-rich and high-silicon material powder is greater than or equal to 600m 2 / kg, the alkaline activator takes clinker and Na 2 SiO 3 mixture, clinker and Na 2 SiO 3 The mass rati...

Embodiment 3

[0037] The object of treatment is the fly ash of a household waste incineration power plant in Shenzhen. The fly ash contains 37.41% calcium, 17.23% chlorine and 18.12% sulfur. The TCLP leaching concentration of chromium, lead and cadmium exceeds the threshold (13.83mg / L, 2.32mg / L and 4.33mg / L).

[0038] The waste incineration fly ash heavy metal curing agent and curing method provided by the present invention are used to process the above waste incineration fly ash, wherein the aluminum-rich high-silicon material is the same aluminum-rich high-silicon material as in Example 2, and the alkaline activator is KOH and K 2 SiO 3 Mixture, KOH and K 2 SiO 3 The mass ratio is 2:1.

[0039] The specific curing process is as follows: Take 180g of waste incineration fly ash and 30g of aluminum-rich high-silicon material, and mix them to obtain a mixed powder. The ratio is 0.40, the quality of the alkaline activator is 9g, and the standard maintenance is 7d.

[0040] The TCLP leac...

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Abstract

The invention provides a curing agent and a curing method for heavy metals in fly ash from mswi (municipal solid waste incineration). The curing agent comprises an aluminum-rich high-silicon material and an alkaline exciting agent, wherein the mass of the aluminum-rich high-silicon material is 15% to 25% of the mass of the fly ash from mswi; the mass of the alkaline exciting agent is 3% to 5% of the mass of the fly ash from mswi. The curing agent adopts industrial waste residues, and raw materials are cheap and easy to obtain; according to the curing method, lots of calcium oxide, chloride and sulfide existing in the fly ash from mswi have a hydration reaction with the aluminum-rich high-silicon material to generate a C-S-H (calcium silicate hydrate), Friedel (calcium chloroaluminate) phase and Aft (ettringite) phase system; during the formation process of the mineral system, a solid solution is formed through ion exchange, a new phase is formed through coprecipitation, and a relatively strong stable constraint effect can be played on heavy metals through physical adsorption and coating, so that wastes can be treated by using wastes, and harmless treatment of the fly ash from mswi and resource utilization of the industrial waste residues are realized.

Description

technical field [0001] The invention belongs to the technical field of industrial waste recycling and hazardous waste treatment and environmental protection, and in particular relates to a heavy metal curing agent for waste incineration fly ash and a curing method thereof. Background technique [0002] With the expansion of the scale of cities in our country, the improvement of economic level and people's living standards, the amount of garbage generated in cities is also increasing. Due to the unique advantages of incineration in reduction and resource utilization, in recent years it has become a The disposal rate of garbage has been on the rise. However, the waste incineration fly ash produced in the process of waste incineration is considered as hazardous waste in many countries due to the concentration of a large amount of heavy metals, and it must be treated innocuously before final disposal. [0003] The solidification and stabilization method has attracted much atten...

Claims

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Application Information

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IPC IPC(8): A62D3/33A62D101/43
CPCA62D3/33A62D2101/43
Inventor 邵雁王文坦李社锋宋自新郭华军赵波陈堃陶玲朱文渊刘子豪
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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