Valorization of Fly Ash from Municipal Solid Waste Incineration Via Hydrothermal Treatment

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Title: Valorization of Fly Ash from Municipal Solid Waste Incineration Via Hydrothermal Treatment

Author(s): A. Guerrero, S. Goiii, E. Fernandez and A. Macias

Publication: Special Publication

Volume: 199

Issue:

Appears on pages(s): 295-306

Keywords: fly ash; hydrothermal treatment; incineration; municipal solid wastes; new-cements; valorization

Date: 6/1/2001

Abstract:
The effect produced by hydrothermal treatment of a mixture of two fly ashes from municipal solid wastes incineration (MSWIFA) is discussed in this work. Two kinds of fly ashes, from fluidized-bed combustion and cleaning-gas devices with different chemical composition, principally in terms of CaO and SiO2 contents, were mixed to synthesize a new low energy cement, like belite cement (Ca/Si > 2). The mixture was hydrothermally treated at 200°C and 1.24 MPa steam-pressure for periods of 1, 2, 4 and 6 hours. Changes of fly ashes compositions were characterized by X-ray diffraction (XRD), Infrared Spectroscopy (IR) and Thermal Analyses (TGA). The evolution of aqueous phase was followed by means of measurements on: pH, conductivity, chloride, sulfate and toxic metals concentration.