Method for stabilizing heavy metals in waste incineration fly ash through combination of coal gangue and calcium oxide

A waste incineration fly ash and domestic waste incineration technology, which is applied in the field of domestic waste incineration fly ash disposal, can solve the problems of low solidification efficiency of heavy metals, low cost, high energy consumption of high-temperature calcination, etc., and achieves good industrial application prospects and capacity reduction Good effect and high curing efficiency
CN113441526AActive Publication Date: 2021-09-28POWERCHINA HEBEI ELECTRIC POWER SURVEY & DESIGN INST CO LTD +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
POWERCHINA HEBEI ELECTRIC POWER SURVEY & DESIGN INST CO LTD
Publication Date
2021-09-28

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Abstract

The invention discloses a method for stabilizing heavy metals in waste incineration fly ash through combination of coal gangue and calcium oxide, and belongs to the field of household waste incineration fly ash treatment. Coal gangue and amorphous SiO2 and Al2O3 in household waste incineration fly ash are subjected to a geological polymerization reaction under the condition of an alkali activator, an inorganic polymer of a three-dimensional net structure is formed, meanwhile, calcium oxide is added, a large quantity of hydrated calcium silicate, hydrated calcium aluminosilicate and hydrated sodium aluminosilicate gel are formed in a cured body during maintenance and react with the heavy metals in manners of physical encapsulation, physical adsorption and ion exchange, so that the heavy metals in the fly ash are harmlessly treated, and it is guaranteed that the heavy metal leaching concentration of the fly ash-coal gangue-calcium oxide polymerization cured body meets the landfill safety standard. The heavy metals in the waste incineration fly ash are stabilized and produced though combination of coal gangue and calcium oxide, the curing efficiency of the heavy metals in the fly ash is further improved, the curing cost is reduced, and the environment-friendly concept of treating wastes with wastes is met.
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Description

technical field

[0001] The invention relates to the technical field of domestic waste incineration fly ash disposal, in particular to a method for compounding and stabilizing heavy metals in waste incineration fly ash by using coal gangue and calcium oxide. Background technique

[0002] At present, the harmless disposal methods of domestic waste are mainly divided into landfill, incineration and composting. Heat supply and power generation, so as to achieve the purpose of resource utilization. However, the fly ash produced by waste incineration contains harmful substances such as dioxins and heavy metals, and is listed as hazardous waste, which requires harmless disposal before being safely landfilled.

[0003] Fly ash treatment technologies mainly include dielectric material solidification technology, high temperature treatment technology and chelating agent stabilization technology. In my country, chemical agent stabilization combined with cement solidification is general...

Claims

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