Porous biological ceramsite prepared from waste incineration fly ash and biomass pyrolysis gasification residue, and preparation method thereof

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...

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