A method of microwave firing porous ceramsite from medical waste incineration fly ash

Abstract

The invention discloses a method for microwave sintering of porous ceramsites by adopting medical waste incineration fly ash. The method comprises the following steps: (1) fully mixing the medical waste incineration fly ash with an auxiliary material, adding a small amount of water into the mixture, and carrying out granulation molding by a molding machine; (2) carrying out granulation molding, drying to obtain a particle raw material, filling the periphery of the particle raw material with a microwave coupling agent powder; and (3) carrying out microwave sintering of the particle raw material filled with the powder, and after sintering, cooling to the room temperature to obtain the porous ceramsites. The method can utilize a 'hot spot' effect of fly ash high-content active carbon in a microwave field to instantly completely decompose dioxins in the fly ash, at the same time, allows most heavy metals to be wrapped and cured in grids of the sintered product, and rapidly sinters the fly ash into the porous ceramsites; and the ceramsites can be used for building aggregates or wastewater filter materials, achieves further resource utilization while achieving harmlessness treatment of the medical waste incineration fly ash, and achieves many things at one stroke.

Description

technical field

[0001] The invention relates to a method for treating environmental pollution, in particular to a method for treating fly ash from incineration of medical waste. Background technique

[0002] Medical waste incineration fly ash is the product of medical waste incineration, the main component is SiO 2 , CaO, Al 2 o 3 and Fe 2 o 3 Inorganic substances, such as dioxins and heavy metals, are enriched in a considerable amount of toxic substances such as dioxins and heavy metals in the ash, which are extremely harmful and have been included in my country's "National List of Hazardous Wastes". Compared with domestic waste incineration fly ash, medical waste incineration fly ash contains a considerable amount of activated carbon and unburned residual carbon, both of which lead to a thermal reduction rate of fly ash as high as 30%. Fly ash flotation detoxification method, and it is confirmed that activated carbon in fly ash is the enrichment source of organic poll...

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