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

Method used

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

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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 3 , Hexavalent chromium<5mg / L, and other h...

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 fu...

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 3 , He...

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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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