Nanocrystalline and stacking-disordered beta -cristobalite AlPO sub(4): the now deciphered main constituent of a municipal sewage sludge ash from a full-scale incineration facility

For the first time evidence is provided that a nanocrystalline and stacking-disordered, chemically stabilized beta -cristobalite form of AlPO sub(4) occurs in a sewage sludge ash (SSA). This proof is based on a combined X-ray powder diffraction and X-ray fluorescence investigation of an SSA produced...

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Bibliographic Details
Published in:Powder diffraction 2015-06, Vol.30 (S1), p.S31-S35
Main Authors: Peplinski, B, Adam, C, Adamczyk, B, Mueller, R, Michaelis, M, Krahl, T, Emmerling, F
Format: Article
Language:English
Subjects:
Ashes
Combustion
Diffraction
Fluidized beds
Incineration
Nanocrystals
Proving
Sewage sludge
X-rays
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Summary:For the first time evidence is provided that a nanocrystalline and stacking-disordered, chemically stabilized beta -cristobalite form of AlPO sub(4) occurs in a sewage sludge ash (SSA). This proof is based on a combined X-ray powder diffraction and X-ray fluorescence investigation of an SSA produced at a large-scale fluidized bed incineration facility serving a catching area with a population of 2 million. The structural and chemical characterization was carried out on 'as received' SSA samples as well as on solid residues remaining after leaching this SSA in sodium hydroxide solution. Thus, it was ascertained that the observed nanocrystalline and stacking-disordered cristobalite-like component belongs to the aluminum phosphate component of this SSA, rather than to its silicon dioxide component. In addition, a direct proof is presented that the chemically stabilized beta -cristobalite form of AlPO sub(4) does crystallize from X-ray amorphous precursors under conditions that mimic the huge heating rate and short retention time (just seconds at T approximately 850 degree C), typical for fluidized bed incinerators.
ISSN:0885-7156
1945-7413
DOI:10.1017/S0885715614001213