Treatment method of waste incineration fly ash

Abstract

The invention discloses a waste incineration fly ash treatment method which comprises a fly ash chelating procedure and a landfill procedure, a movable stock bin extrusion procedure is further arranged between the fly ash chelating procedure and the landfill procedure, and the movable stock bin extrusion procedure comprises the steps that materials obtained through fly ash chelating are loaded into a movable stock bin, and the movable stock bin is extruded into the movable stock bin. All the walls of the movable stock bin are detachable, all the walls define a cavity of a regular polyhedron structure, an HDPE double-rough-surface film is arranged on the inner wall face of all the walls, and after the materials are extruded and formed through the movable stock bin, a landfill unit wrapped by the HDPE double-rough-surface film is obtained; the landfill comprises stacking and joint filling, and the joint filling material is artificial sodium bentonite. The landfill body obtained through the treatment method has excellent strength, stability and durability, the treatment method is simple, convenient and efficient, the storage capacity occupied by landfill can be reduced, the safety of the landfill body is improved, and the toxicity leaching risk is reduced.

Description

technical field [0001] The invention relates to the field of fly ash treatment, in particular to a treatment method for waste incineration fly ash. Background technique [0002] Waste incineration fly ash refers to the extremely fine particles collected by various pollution control equipment during the flue gas treatment process after the incineration of domestic waste, mainly including the medium collected from the discharge of the preheating boiler, the deacidification tower and the bag filter. The main components are silicates and oxides of calcium, aluminum and iron, and the main pollutants are heavy metals. The bulk density of incineration fly ash is generally 0.5-1.0g / cm 3 , In my country's National Hazardous Waste List, it is clearly pointed out that fly ash is a hazardous waste, but after being processed to meet the relevant requirements of the "Contamination Control Standard for Domestic Waste Landfills" (GB16889-2008), it can enter the domestic waste landfill for ...

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Problems solved by technology

However, the applicant found that, in terms of chelation treatment, due to the addition of materials such as cement and chelating agents during the chelation and solidification process of fly ash, the volume of the treated product has been increased to a certain extent, and the traditional fly ash treatment process is to deal with The mixed material is bagged in ton bags. During each bagging process, it is necessary to stop the mixer from discharging and install the ton bag at the outlet of the mixer before continuing to discharge. At the same time, due to the weather resistance, corrosion resistance and The anti-aging ability is very limited, and the solidified fly ash after landfill still has the risk of toxic leaching, which will cause secondary pollution, and as the pile increases and the landfill time increases, the big bag is squeezed, corroded, and aged. The stability and durability of the entire landfill are affected

In terms of landfill, the structure of the fly ash solidified body is very scattered after landfill, and the shape and size of the solidified body are difficult to achieve complete consistency. The density of fly ash after bagging is low. Affected by rainwater immersion, the solidified body is easy to absorb water and soften. If a part of the solidified body in the pile moves, it is likely to cause the entire pile to become unstable and affect the overall safety of the pile. Valley-type landfills with high body heights have particularly critical requirements for landfill stability and durability

The anti-seepage layer of the valley-type landfill construction is divided into the bottom anti-seepage layer and the slope anti-seepage layer. There is a pass position, which will lead to the slope in some directions without anti-seepage structure, and because the landfill height of the valley type landfill (50m~100m) is much higher than that of the plain type landfill (10m~20m), the landfill height of The increase has greatly tested the strength, stability and durability of the landfill. Therefore, it is imminent to develop a simple and convenient waste incineration treatment method with high strength, high stability and durability.

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