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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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 of the existing treatment technologies can meet the above conditions at the same time, and it cannot be effectively harmless treated

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1, 1 kilogram of the weight of ball nucleus raw material, comprises rubbish fly ash 78.%, coal dust 20%, special adhesive 2% (it is made of syrup 50%; Glutinous rice flour 20%; Humic acid 20% and borax 10% composition), using disk granulation technology to make a spherical core with a diameter of 5mm. The raw material of the spherical shell is 2 kg, 98% of garbage slag and 2% of bentonite are used, and the spherical shell is formed outside the spherical core by disc granulation technology, and the diameter of the spherical shell 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 placed in the furnace for incineration. The whole process simulates the thermal system of waste incineration, the temperature is 850-1000 ℃, and the time is 2 hours. The product was taken out for various tests, and the relevant control indicators were found...

Embodiment 2

[0037] Treatment of garbage fly ash: moisture less than 4%, particle size -200 mesh

[0038] Calculated on the basis of 1 ton of the total amount of ball core raw materials, 0.78 tons of garbage fly ash, 0.2 tons of coal powder and coke powder (the amount of the two can be arbitrarily mixed), 0.02 tons of special adhesive (including 60% syrup; glutinous rice flour 15%; Humic Acid 17%; Borax 8%). After being mixed by the mixer, it enters the disc granulator to produce a spherical core with a diameter of 6 mm. The semi-finished product passed through the vibrating screen is sent to the secondary pelletizing disc by a belt conveyor, and 1.96 tons of garbage slag and 0.04 tons of bentonite are uniformly mixed. The mixture is sent to the secondary pelletizing disk for shell making. The diameter of the spherical shell is 13mm. After the green balls are formed, they enter the sealed special transport vehicle and send them to the garbage incinerator. Sample, tested: related control i...

Embodiment 3

[0040] Treatment of garbage fly ash: moisture less than 4%, particle size -200 mesh

[0041] Assuming that the total amount of spherical core raw materials is 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, enter the disc granulator to make The semi-finished product with a diameter of 8mm and passed through the vibrating screen is sent to the secondary pelletizing disc by a belt conveyor. At the same time, 19.6 tons of garbage slag and 0.4 tons of humic acid are evenly mixed and sent to the secondary pelletizing disc for shell making. , the diameter of the spherical shell is 16mm. After the raw ball is formed, it enters the sealed special transport vehicle and sends it to the garbage incinerator. 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 purpos...

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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.

Description

technical field [0001] The technology belongs to the field of environmental protection urban garbage treatment. Background technique [0002] Fly ash refers to the residue collected in the waste incineration power plant flue gas purification system (APC) and heat recovery system (such as economizer, boiler, etc.), accounting for about 20% of the total ash, about It accounts for 3% to 5% of the total amount of waste incinerated. Domestic waste incineration fly ash is not only enriched in low-boiling heavy metals such as Pb, Cd, and Hg, but also the main enrichment body of dioxins, which is currently considered to be a relatively harmful hazardous waste. The harm of waste incineration fly ash to the environment and ecosystem is mainly reflected in the following four aspects: [0003] (1) Salt pollution: fly ash contains a large amount of soluble chloride salts. According to data, Cl in fly ash - It can be as high as 112000mg / kg, which may pollute groundwater and promote the...

Claims

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Application Information

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IPC IPC(8): B09B3/00
Inventor 李秉正邓勇
Owner CHONGQING ANGRUIYUE SCI & TECH
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