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Method for treating flying ash of burning garbage

A waste incineration fly ash and treatment method technology, which is applied in the field of resource utilization, can solve the problems that the stability effect is greatly affected by the pH value, the area of ​​direct contact with the environmental medium is large, and has no strength, so as to reduce the possibility and increase The effect of small volume ratio and increased strength

Inactive Publication Date: 2007-10-10
深圳市市政环卫综合处理厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of these inorganic agents is that the stabilization effect is greatly affected by the pH value. In addition, the fly ash is still loose after treatment, does not form, does not have strength, and has a large area in direct contact with the environmental medium.
High temperature treatment includes melting solidification method and sintering technology, which consumes a lot of energy and needs to deal with the secondary fume. Usually, the treatment cost per ton is more than 1,000 yuan, and it is difficult to implement in our country.
However, the process of extracting heavy metals by solvents such as acids is complicated, and waste water needs to be treated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The fly ash collected by the bag filter of a grate type garbage incinerator is mixed with 1.5~3 times the quality of river water to form an ash / water mixed system. 4 ·7H 2 (2) Make a saturated solution, and add about one-third of the green vitriol solution into the above-mentioned ash / water mixed system, and after reacting for about 3 to 5 hours (hours), add all the remaining green vitriol solutions to the ash / water After continuing to oxidize in the mixed system for 0.5h, adjust the pH value of the system to between 8 and 11.5 (generally, it is within this range without adjusting the pH value), and then carry out liquid-solid separation; the ash cake is sent to the mixer, and mixed with P .II 42.5 Grade cement mixture, the mass ratio of cement to fly ash is 1:9. Then make blocks, after 3 days of curing at room temperature with a humidity greater than 90%, the compressive strength is 0.79Mpa; after 28 days of curing, the compressive strength is 0.83Mpa, and the leachin...

Embodiment 2

[0021] The fly ash collected by the electrostatic precipitator of a grate type garbage incinerator is mixed with tap water with 2 to 3 times the mass, and green alum (FeSO 4 .7H 2 O) Make a saturated solution, and add two-thirds of the solution into the above-mentioned ash / water mixed system, stir and oxidize for about 2.5 hours, then add the remaining all green vitriol solution into the ash / water mixed system to continue oxidation for 0.5 h, the pH value of the mixed solution is 10.2, and liquid-solid separation is carried out; the ash cake is sent to stirring, and mixed with P.II 42.5 grade cement, and the mass ratio of cement to fly ash is 1:1. Then make a block, after 7 days of curing at room temperature with a humidity greater than 90%, the compressive strength is 11.03Mpa, after 28 days of curing at room temperature, the compressive strength is 25.0Mpa, the leaching concentrations of Cd, Cr, Pb, and Zn are respectively 2.9ppb, 380pbb, 58ppb and 67ppb, all far below 1ppm...

Embodiment 3

[0023] The fly ash collected by the electrostatic precipitator of a grate type garbage incinerator is mixed with river water with 1.5 to 3 times the quality of the fly ash; the mass of green alum (FeSO 4 .7H 2 0) be made into a saturated solution, and two-thirds of the solution is added in the above-mentioned ash / water mixed system, the liquid-solid system becomes reddish-brown after about 5 hours of oxidation reaction, then the remaining green alum solution is added to continue oxidation for 0.5h, Afterwards, the pH value of this system is 10.1, and the liquid-solid separation is carried out; the ash cake is sent to the mixer, and mixed with P.II 42.5 grade cement, and the mass ratio of cement to fly ash is 7:3. Then make blocks, after 7 days of curing at room temperature with a humidity greater than 90%, the compressive strength is 25Mpa, and after 28 days of curing at room temperature, the compressive strength is 41Mpa, and the leaching concentrations of Cd, Cr, Pb, and Zn ...

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Abstract

A process for treating the fly ash generated by incinerating garbage and preventing the release of heavy metal and dioxin includes such steps as mixing with water, adding the solution of inorganic chemical, stirring, heavy ion reaction to generate stable compound, regulating pH=8-11.5, removing excessive water, mixing with cement, shaping, and curing to obtain building material.

Description

technical field [0001] The invention relates to the field of solid waste treatment, and refers to a method for harmless treatment of waste incineration fly ash containing heavy metals and dioxins and suitable for resource utilization. Background technique [0002] Urban waste disposal is the top priority of urban sanitation work. At present, incineration is a relatively common disposal method. However, the process of waste incineration will produce a large amount of fly ash, which is about 2-5% of the mass of waste entering the furnace; waste incineration fly ash is a hazardous waste stipulated by the national standard, and cannot enter the ecological environment without special treatment. With the popularization and application of municipal solid waste, the output of waste incineration fly ash is increasing day by day. The bulk density of fly ash is only 600kg / m 3 Left and right, hoarding and landfilling all take up a lot of space, so the task of timely processing of inci...

Claims

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Application Information

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IPC IPC(8): A62D3/33A62D101/08A62D101/43
Inventor 龚佰勋曹学义姜宗顺吴立陈德珍王正宇张清
Owner 深圳市市政环卫综合处理厂
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