Method for harmlessly treating trash flying ash by adopting trash-burning process

A technology of harmless treatment and garbage incineration, which is applied in the direction of solid waste removal, etc., can solve problems such as inability to make harmless treatment, and achieve the effect of low treatment cost, simple process and remarkable effect

Active Publication Date: 2010-11-24
CHONGQING ANGRUIYUE SCI & TECH
4 Cites 39 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0008] To sum up, high temperature and reducing atmosphere are essential conditions to effectively treat garbage fly ash, but none ...
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Method used

Incineration test was carried out in the test furnace; the test atmosphere was an oxidizing atmosphere, and liquefied gas was used as fuel, and the raw pellets were burned in the furnace, and the whole process simulated the thermal system of waste incineration, with a temperature of 850-1000 ° C and a time of 2 hours...
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Abstract

The invention provides a method for harmlessly treating trash flying ash by adopting a trash-burning process. The method comprises the following steps of: (1) preparing trash flying ash into ball cores by using an adhesive in the presence of coal powder and/or coke powder used as a reducing agent; and (2) making the ball cores, the trash-burning slag and the adhesive into composite spherules, making the trash-burning slag into ball shells, burning in a burning furnace in a trash-burning generating plant and detoxifying the trash flying ash in ball cores in a reduction atmosphere small environment made from numerous spherules during trash burning. The method of the invention can be adopted to very effectively achieve the aim of harmlessly treating the trash flying ash by directly utilizing the burning equipment in the trash-burning plant and has simple process, low treatment cost and remarkable effect.

Application Domain

Solid waste disposal

Technology Topic

SlagCoal +10

Image

  • Method for harmlessly treating trash flying ash by adopting trash-burning process

Examples

  • Experimental program(4)

Example Embodiment

[0034] Example 1, the weight of the core material is 1 kg, which includes 78.% of garbage fly ash, 20% of coal powder, 2% of special adhesive (which is composed of 50% syrup; 20% glutinous rice flour; 20% humic acid and borax 10% composition), the core is made by disc granulation technology with a diameter of 5mm. The raw material of the spherical shell is 2 kilograms, using 98% garbage slag and 2% bentonite. The spherical shell is formed outside the core by the disc granulation technology, and the diameter of the ball is 10mm.
[0035] The incineration test is carried out in the test furnace; the test atmosphere is an oxidizing atmosphere, liquefied gas is used as fuel, and the green pellets are burned in the furnace. The whole process simulates the waste incineration thermal system, the temperature is 850-1000℃, and the time is 2 hours. Take out the product and carry out various tests, and the relevant control index detected is: Dioxin <1ngTEQ/Nm 3 , Hexavalent chromium<5mg/L, and other heavy metals -Hg<0.1mg/L, Cd<1mg/L, Pb<5mg/L, all meet the national environmental protection requirements and achieve the purpose of detoxification treatment.

Example Embodiment

[0036] Example 2:
[0037] Treatment of garbage fly ash: moisture content less than 4%, particle size -200 mesh
[0038] Taking the total amount of core raw materials as 1 ton, take 0.78 tons of garbage fly ash, 0.2 tons of coal powder and coke powder (the two can be in any ratio), and 0.02 tons of special adhesive (including 60% syrup; glutinous rice flour) 15%; Humic acid 17%; Borax 8%). After being mixed by a mixer, it enters the disc granulator to produce a 6mm diameter core, and the semi-finished product after passing through a vibrating screen is sent to the secondary pelletizing disc with a belt conveyor, and at the same time, 1.96 tons of garbage slag and 0.04 tons of bentonite are uniformly distributed. The mixture is sent to the secondary pelletizing disc for shell formation. The spherical shell has a diameter of 13mm. After the green pellets are formed, they enter the sealed special transport truck and send them to the garbage incinerator. The charge is sent into the furnace according to the proportion and taken out after incineration. Sample, tested: the relevant control index dioxin <1ng TEQ/Nm 3 , Hexavalent chromium <5mg/L, and other heavy metals -Hg<0.1mg/L, Cd<1mg/L, Pb<5mg/L all meet the national environmental protection requirements and achieve the purpose of detoxification treatment.

Example Embodiment

[0039] Example 3:
[0040] Treatment of garbage fly ash: moisture content less than 4%, particle size -200 mesh
[0041] Taking the total ball core raw material as 10 tons, take 6.9 tons of garbage fly ash, 3 tons of coke powder or coal powder (-200 mesh), and 0.1 tons of humic acid. After being mixed by a mixer, it enters the disc granulator to make The semi-finished product with a diameter of 8mm after passing through the vibrating screen is sent to the secondary pelletizing disc with a belt conveyor. At the same time, 19.6 tons of garbage slag and 0.4 tons of humic acid are uniformly mixed and sent to the secondary pelletizing disk for shelling. , The diameter of the spherical shell is 16mm. After the green ball is formed, it enters the sealed special transport vehicle and sends it to the garbage incinerator. The charge inlet is sent into the furnace according to the proportion; after the incineration, the sample is taken out and tested: the relevant control index (dioxin < 1ng TEQ/Nm 3 , Hexavalent chromium <5mg/L, and other heavy metals -Hg<0.1mg/L, Cd<1mg/L, Pb<5mg/L) all meet the national environmental protection requirements and achieve the purpose of detoxification treatment.

PUM

PropertyMeasurementUnit
Diameter3.0 ~ 8.0mm
Diameter5.0 ~ 16.0mm
Diameter5.0mm

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