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A kind of porous biological ceramsite prepared from waste incineration fly ash and biomass pyrolysis gasification residue and preparation method thereof

A waste incineration fly ash, pyrolysis and gasification technology, applied in the direction of ceramic products, other household utensils, household utensils, etc., can solve the problems of blank application in the field of wastewater treatment, recycling of heavy metal resources, and hazards to the surrounding environment, and achieve the realization of Effects of harmless treatment, realization of recycling, and reduction of pollution toxicity

Inactive Publication Date: 2020-10-30
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the ceramsite fired from waste incineration fly ash is mostly used in building materials, and the application in the field of wastewater treatment is still blank.
In addition, fly ash contains high salt content (mainly chlorine salts) and abundant heavy metal resources, but the existing method of burning ceramsite with fly ash does not recycle these heavy metal resources. On the contrary, these heavy metal substances are in In the presence of chlorine, there is still a great risk of leaching, which will cause potential harm to the surrounding environment
[0004] On the other hand, heavy metal wastewater has become one of the most serious environmental pollution and the most harmful industrial wastewater to human beings. The types, contents and forms of heavy metals in wastewater vary greatly with different production types. Discharge will inevitably cause serious pollution to the environment, and discharge without recycling will inevitably cause a great waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Waste incineration fly ash gasification treatment and biomass pyrolysis gasification

[0026] Gasification treatment of waste incineration fly ash: mix waste incineration fly ash with chlorine-containing gasification agent, and roast at 800-1000°C for 0.5-3h, the mass fraction of the chlorine-containing gasification agent is 2-20wt%; Secondary fly ash is collected by bag filter for recycling, and residual fly ash after roasting is collected as one of the raw materials for subsequent steps;

[0027] According to the type and content of heavy metals in waste incineration fly ash, adjust the type and amount of chlorine-containing gasification agent, gasification temperature and time to achieve the best heavy metal separation effect. In the present invention, the gasification agent containing chlorine is one or a mixture of two or more of potassium chloride, calcium chloride, sodium chloride, magnesium chloride, aluminum chloride and ferric chloride.

[0028] Bi...

Embodiment 2-6

[0030]Embodiment 2-6: the preparation of porous biological ceramsite

Embodiment 2

[0032] The raw material mass percentage of the porous biological ceramsite prepared by the present embodiment is constituted as:

[0033] 25% of waste incineration fly ash after gasification heat treatment, 15% of biomass pyrolysis-gasification residue, 15% of tourmaline, 30% of fly ash and 15% of kaolin.

[0034] Porous biological ceramsite obtained by the following preparation method in the present embodiment:

[0035] Mix waste incineration fly ash, biomass pyrolysis-gasification residue, tourmaline, fly ash, and kaolin after gasification heat treatment according to the above mass ratio, and pass through a 40-100 mesh sieve after crushing to obtain the mixture. Add water to the mixture, the amount of water to be added is 30% of the weight of the mixture, then fully stir the mixture, mix evenly, use a granulator to granulate into spherical particles of 2-15mm, and the spherical particles are at 105 ° C. Dry at a constant temperature for 3 hours until the water content is le...

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Abstract

The invention discloses a method used for producing porous biological ceramsite by taking waste incineration fly ash and biomass pyrolysis-gasification residue as raw materials. The method comprises following steps: household garbage incineration fly ash is subjected to high temperature treatment in the presence of a gasification agent so as to obtain residual ash; biomass is subjected to low temperature pyrolysis-high temperature steam gasification so as to obtain a pyrolytic residue; the residual ash, the pyrolytic residue, flyash, clay, and a pore-forming agent are subjected to mixing, pelleting, drying, and high temperature roasting so as to obtain the porous biological ceramsite product. Technology of the method is simple; operation is convenient; harmlessness treatment of fly ash and biomass pyrolysis gasification residue can be realized; the porous biological ceramsite product is prepared from waste incineration fly ash and biomass pyrolysis residue; quantity demand of ceramsite industrial on natural raw materials is reduced; and environment-protection value and economic value are both high.

Description

technical field [0001] The invention provides a kind of porous biological ceramsite for heavy metal wastewater treatment prepared by using waste incineration fly ash and biomass pyrolysis residue, the purpose is to resource utilization of waste incineration fly ash and biomass pyrolysis residue, not only effectively reduce the Environmental load can also increase the added value of waste resources. Background technique [0002] With the growth of my country's urban population, economic development and improvement of residents' living standards, the discharge of domestic waste is increasing day by day. Domestic waste incineration is becoming an important means of dealing with municipal waste and developing new energy in many countries where land and energy resources are scarce due to its small footprint, remarkable effect of volume reduction and harmlessness, and thermal energy utilization. Fly ash is the main carrier of secondary pollution from waste incineration. It is gen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00
Inventor 孔丝纺曾辉
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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