Alkali Activation–Granulation of Hazardous Fluidized Bed Combustion Fly Ashes

Yliniemi, J.H.; Pesonen, Janne; Tanskanen, Pekka; Peltosaari, Olli; Tiainen, Minna; Nugteren, H.W.; Illikainen, Mirja

doi:10.1007/s12649-016-9580-7

Alkali Activation–Granulation of Hazardous Fluidized Bed Combustion Fly Ashes

Title

Alkali Activation–Granulation of Hazardous Fluidized Bed Combustion Fly Ashes

Author

Yliniemi, J.H. (University of Oulu)
Pesonen, Janne (University of Oulu)
Tanskanen, Pekka (University of Oulu)
Peltosaari, Olli (University of Oulu)
Tiainen, Minna (Center for Molecular Materials)
Nugteren, H.W. (TU Delft ChemE/Product and Process Engineering)
Illikainen, Mirja (University of Oulu)

Date

2017

Abstract

Abstract: The increasing amount of fluidized bed combustion (FBC) ash is putting pressure on researchers to invent novel methods for utilizing the ash. The low reactivity and heavy metal content constrict the use of FBC ash in the same way as coal ash from pulverized combustion. Four FBC fly ashes from different power plants were granulated with sodium silicate solution in order to produce artificial aggregates. All aggregates matched the definition for lightweight aggregate according to the EN 13055-1 standard. The strongest aggregates were produced from fly ashes that had the highest X-ray amorphous material content and the highest amount of selectively soluble SiO₂ and Al₂O₃. However, the same leaching problem (leaching of the anionic species) as with coal fly ashes was observed with the FBC fly ashes. The simultaneous high shear granulation and alkali activation of FBC ashes showed that artificial aggregates with satisfactory physical properties, such as density and strength, can be obtained even from low-reactive fly ashes that contain heavy metals. Graphical Abstract: [Figure not available: see fulltext.]

Subject

Alkali activation
Fluidised bed combustion
Fly ash
Granulation
Heavy metal
Lightweight aggregate

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http://resolver.tudelft.nl/uuid:2cd19c0e-b44c-4ed8-a6cd-abcc801cbfc7

DOI

https://doi.org/10.1007/s12649-016-9580-7

Embargo date

2017-05-26

ISSN

1877-2641

Source

Waste and Biomass Valorization, 1-10