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Refuse incineration fly ash solidification/stabilization treatment method

A waste incineration fly ash and stabilization treatment technology, which is applied in the field of waste incineration fly ash treatment, can solve the problems of high operating cost and large energy consumption, achieve enhanced stabilization effect, low material and energy consumption, and solve ecological environmental protection and human body problems. health hazard effects

Inactive Publication Date: 2011-02-16
天津渤海环保工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Melting treatment consumes a lot of energy, and the operating cost is high. The cost of fly ash treatment exceeds 1,000 yuan / ton. Acid extraction is usually mainly suitable for heavy metal recovery of secondary fly ash after melting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The fly ash collected by the bag filter of a certain grate type garbage incinerator is green alum (FeSO 4 ·7H 2 O) is configured into a solution with water, the total mass of the solution is 52% of the fly ash quality, and the added cement quality is 15% of the fly ash quality, the solution mixed with fly ash and cement is mixed and injected into the mold, and the test block is maintained to After 7 days, the unconfined compressive strength was 0.235MPa, the leaching concentrations of Zn, Cd, Cr, and Cu were 5.85mg / l, 0.109mg / l, 0.605mg / l, and 0.125mg / l, respectively, and Pb was not detected. It is lower than the entrance control standard of domestic waste landfill, compared with the original fly ash, the capacity increase rate is only 0.548, and the total treatment cost is lower than 320 yuan / ton.

Embodiment 2

[0014] For the fly ash collected by the bag filter of a grate type garbage incinerator, the EDTA heavy metal stabilizer with a mass of 2.5% of the mass of the fly ash is mixed with water to form a solution. The total mass of the solution is 49% of the mass of the fly ash. The mass of cement added is It is 16% of the mass of fly ash. The prepared solution is mixed with fly ash and cement and injected into the mold. The unconfined compressive strength of the test block is 0.29MPa after standard curing for 7 days. 3.23mg / l, 0.102mg / l, 1.03mg / l, 0.65mg / l, and Pb was not detected, all of which were lower than the entry control standards for domestic waste landfills. Compared with the original fly ash, the capacity expansion rate was only 0.559, the total processing cost is less than 320 yuan / ton.

Embodiment 3

[0016] The fly ash collected by the bag filter of a fluidized bed waste incinerator is prepared into a solution with thiourea and water with a mass of 4% of the mass of the fly ash. The total mass of the solution is 54% of the mass of the fly ash, and the mass of cement added is 15% of the ash mass, the prepared solution was mixed with fly ash and cement and injected into the mold. The unconfined compressive strength of the test block was 0.31MPa after standard curing for 7 days, and the leaching concentrations of Zn, Cd, Cr, and Cu were 8.95 mg / l, 0.085mg / l, 1.03mg / l, 1.28mg / l, Pb was not detected, all of which were lower than the entry control standards for domestic waste landfills. Compared with the original fly ash, the capacity expansion rate was only 0.547, The total processing cost is less than 370 yuan / ton.

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PUM

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Abstract

The invention discloses a refuse incineration fly ash solidification / stabilization treatment method comprising the following steps of: firstly, sufficiently mixing a heavy metal stabilizer and water into a solution; mixing the solution, refuse incineration fly ashes and a little amount of cement, stirring and curing so that fly ashes has double-effect stabilization and certain intensity at the same time; finally, landfilling the fly ashes in a domestic refuse landfill site. The refuse incineration fly ash solidification / stabilization treatment method realizes fly ash decontamination and achieves the purpose of slightly increasing volume at the same time, thereby increasing the overall efficiency and the economical efficiency of a fly ash treating and disposing system and solving the problem of large increasing volume after the traditional cement solidification treatment.

Description

technical field [0001] The invention relates to a method for treating waste incineration fly ash, in particular to a method for solidification / stabilization treatment of waste incineration fly ash. Background technique [0002] As more and more waste incineration plants are built and put into use, the discharge of waste incineration fly ash in my country will also become larger and larger. Waste incineration fly ash contains heavy metals, dioxins, furans and other harmful substances, which belong to the category of heavy metal hazardous waste to be controlled. In 2001, the State Environmental Protection Administration promulgated the "Hazardous Waste Pollution Prevention Technical Policy" stipulated that: fly ash must be solidified and stabilized before it can be transported at the place of production; domestic waste incineration fly ash must be sent to a safe landfill for disposal. However, the cost of safe landfill treatment is very high, and the site is difficult to find...

Claims

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Application Information

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IPC IPC(8): B09B3/00
Inventor 张曙光刘汉桥郝永俊高建东刘彦博杨恩德付晨光
Owner 天津渤海环保工程有限公司
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