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Evidence of formation of the tridymite form of AlPO4 in some municipal sewage sludge ashes

  • Evidence is provided that the tridymite component observed in the X-ray diffraction patterns of some sewage sludge ashes (SSAs) should not be interpreted as the tridymite modification of SiO2 but as the tridymite form of AlPO4. This proof is based on a combined X-ray Powder Diffraction (XRD), X-ray fluorescence (XRF) and Mossbauer spectroscopy investigation of two SSAs produced at two fluidized bed incineration facilities, located in different municipalities and operated differently. The structural and chemical characterization was carried out on the 'as received' SSA samples as well as on the residues of these two SSAs pretreated by leaching in citric acid. In addition, direct proof is presented that the tridymite form of AlPO4 does crystallize from X-ray amorphous precursors under conditions that mimic the huge heating rate and short retention time (just seconds at T ≈ 850 °C) typical for fluidized bed incinerators.

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Autoren/innen:Burkhard Peplinski, Christian Adam, Burkart Adamczyk, Ralf Müller, Reinhard Schadrack, Matthias Michaelis, Franziska EmmerlingORCiD, H. Reuther, Michael Menzel
Titel des übergeordneten Werkes (Englisch):Powder diffraction
Jahr der Erstveröffentlichung:2013
Verlagsort:Swarthmore, Pa.
Erste Seite:S425
Letzte Seite:S435
Freie Schlagwörter:Aluminium phosphate; Ash; Fly ash; Incinerator ash; Sewage sludge ash; Tridymite form
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:05.12.2013