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Treating method for city life garbage burning flyash

A municipal solid waste and incineration fly ash technology, applied in the direction of solid waste removal, etc., can solve the problems of low added value of fly ash recycling products, high cost of fly ash recycling, heavy metal ion leaching and other problems, and achieve acid and alkali resistance The effect of wide range, wide source of fly ash and high activation rate

Inactive Publication Date: 2005-03-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these resource-based treatments failed to solve practical engineering problems: (1) The leaching of heavy metal ions in fly ash after recycling is always a concern; (2) The cost of recycling fly ash is too high to be suitable for mass production; (3) ) The added value of fly ash recycling products is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Dry a certain amount of fly ash, sieve it through a 125 μm sieve hole, then weigh 100 grams of fly ash, add 0.5 liter of aqueous solution, and make a suspension with a water-cement ratio of 5:1 liquid, and then blended in a blender. The water bath is warmed up to 45°C and stirred for 10 minutes, then the chelating anionic surfactant potassium salt of lauryl monophosphate is added, which has a structure of twelve carbon long chains and chelating agent phosphoric acid, and the amount of addition is 5.0 ml , under the condition of constant temperature, keep the rotation speed at 1000rpm and continue to stir for 15 minutes, so that the fly ash particles and potassium lauryl alcohol monophosphate fully react; then separate the solid and liquid, and bake the modified fly ash at 105°C After 24 hours, sieve and store in a sealed container.

Embodiment 2

[0017] Embodiment 2: Dry a certain amount of fly ash, sieve it through a Taylor standard, make it pass through a 125 μm sieve hole, then weigh 100 grams of fly ash, add 1 liter of aqueous solution, and make a suspension with a water-cement ratio of 10:1 liquid, and then blended in a blender. The water bath is warmed up to 75°C and stirred for 10 minutes, then the chelating anionic surfactant citrate stearin is added, which has the structure of eighteen carbon long chains and chelating agent citric acid, and its addition is 3.0 Milliliters, under the condition of constant temperature, keep the rotation speed at 1000rpm and continue to stir for 25 minutes to make the fly ash particles and glyceryl citrate stearate fully react; then separate the solid and liquid, and put the modified fly ash Bake for 24 hours, then sieve and store in a sealed container.

Embodiment 3

[0018] Embodiment 3: Dry a certain amount of fly ash, sieve it through a Taylor standard, make it pass through a 125 μm sieve hole, then weigh 100 grams of fly ash, add 2 liters of aqueous solution, and make a suspension with a water-cement ratio of 20:1 liquid, and then blended in a blender. The water bath is warmed up to 30°C and stirred for 10 minutes, then the chelating anionic surfactant N-lauroyl ethylenediamine triacetic acid is added, which has the structure of twelve carbon atom long chains and chelating agent EDTA, and its addition is 2.0 ml, under the condition of constant temperature, keep stirring at 1000rpm and continue to stir for 20 minutes, so that the fly ash particles and N-lauroyl ethylenediamine triacetic acid fully react; then the solid-liquid separation, the modified fly ash in Bake at 105°C for 24 hours, then sieve and store in a sealed container.

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PUM

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Abstract

The present invention belongs to the field of environment protecting and powder surface modifying technology. The treating method of the city life garbage burning flyash adopts anionic surfactant with chelating function and over 8 carbon chain structure. The wet flyash modifying process includes the following steps: weighing certain amount of flyash, adding into water solution, stirring in stirrer and heating in water bath at 25-80 deg.c for 10 min; adding specific chelating anionic surfactant with C12H25OPO3K2 as main component in 2-5 %; further stirring at certain amount of temperature and rotation speed for 15-25 min; sieving and sealed maintenance.

Description

technical field [0001] The invention relates to a treatment method for incineration fly ash of municipal domestic waste, and belongs to the technical field of environmental protection and powder surface modification chemical technology. Background technique [0002] Hazardous and hazardous waste management is an integral part of global environmental issues and a prominent issue in my country's environmental protection. Municipal waste incineration is an important means of urban domestic waste disposal. The incineration process will produce a large amount of fly ash. Waste incineration fly ash contains many harmful heavy metals such as lead, cadmium, and zinc. More importantly, incineration fly ash will also enrich toxic components such as dioxins and furans that are carcinogenic to humans. The existing environmental conditions at home and abroad Regulations have classified it as hazardous waste, emphasizing that it must be disposed of safely. [0003] According to the Shang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
Inventor 钱光人张后虎董世翔
Owner SHANGHAI UNIV
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