Fly and bottom ashes, produced by incineration plants and/or as by-products of coal combustion in thermal power plants, include, even if in different amounts, heavy metals, dioxins and furans, as well as a considerable amount of SiO 2, that is the main component of glass: therefore these wastes can be utilized as raw materials for the production of composite materials. Vitrification is a method that: i) allows to immobilize the dangerous materials if present in the ashes; ii) produces materials that are inert towards a lot of chemical compounds and iii) allows to notably reduce waste volumes. The WBRM process, one of the most studied vitrification projects in the last years, substained by the European Union, foresees glass fiber production by utilizing fly ashes coming from municipal solid wastes and other special waste combustion, properly mixed with specific different correctors according to their possible subsequent applications. The fibers obtained show physical and mechanical characteristics analogue to the glass fibers of the type E, at present used in the production of clothes, textiles, plastic materials and bituminous coverings, and are more resistent to the attack of alkaline compounds in respect of the glass fibers of the type E. The WBRM process, by using and thermically treating fly ashes, gives full value to these types of wastes, representing a useful alternative to landfills.

La vetrificazione delle ceneri e il processo WBRM

NOVELLI, Veronica;CECCON, Luciano
2007-01-01

Abstract

Fly and bottom ashes, produced by incineration plants and/or as by-products of coal combustion in thermal power plants, include, even if in different amounts, heavy metals, dioxins and furans, as well as a considerable amount of SiO 2, that is the main component of glass: therefore these wastes can be utilized as raw materials for the production of composite materials. Vitrification is a method that: i) allows to immobilize the dangerous materials if present in the ashes; ii) produces materials that are inert towards a lot of chemical compounds and iii) allows to notably reduce waste volumes. The WBRM process, one of the most studied vitrification projects in the last years, substained by the European Union, foresees glass fiber production by utilizing fly ashes coming from municipal solid wastes and other special waste combustion, properly mixed with specific different correctors according to their possible subsequent applications. The fibers obtained show physical and mechanical characteristics analogue to the glass fibers of the type E, at present used in the production of clothes, textiles, plastic materials and bituminous coverings, and are more resistent to the attack of alkaline compounds in respect of the glass fibers of the type E. The WBRM process, by using and thermically treating fly ashes, gives full value to these types of wastes, representing a useful alternative to landfills.
2007
9788890268823
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11390/881823
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