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

Published online by Cambridge University Press:  14 November 2013

B. Peplinski ,
C. Adam ,
B. Adamczyk ,
R. Müller ,
R. Schadrack ,
M. Michaelis ,
F. Emmerling ,
H. Reuther  and
M. Menzel
B. Peplinski*
Affiliation:
BAM Federal Institute for Materials Research and Testing, Berlin, Germany
C. Adam
Affiliation:
BAM Federal Institute for Materials Research and Testing, Berlin, Germany
B. Adamczyk
Affiliation:
BAM Federal Institute for Materials Research and Testing, Berlin, Germany
R. Müller
Affiliation:
BAM Federal Institute for Materials Research and Testing, Berlin, Germany
R. Schadrack
Affiliation:
BAM Federal Institute for Materials Research and Testing, Berlin, Germany
M. Michaelis
Affiliation:
BAM Federal Institute for Materials Research and Testing, Berlin, Germany
F. Emmerling
Affiliation:
BAM Federal Institute for Materials Research and Testing, Berlin, Germany
H. Reuther
Affiliation:
Helmholtz-Zentrum Dresden-Rossendorf, Germany
M. Menzel
Affiliation:
BAM Federal Institute for Materials Research and Testing, Berlin, Germany
*
E-mail: [email protected]
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Abstract

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.

Keywords

aluminum phosphateashfly ashincinerator ashsewage sludge ashtridymite form
Type
Technical Articles
Information
Powder Diffraction , Volume 28 , Supplement S2 , September 2013 , pp. S425 - S435
Copyright
Copyright © International Centre for Diffraction Data 2013 

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References

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