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11:14
Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
Published on: February 21, 2017
Alkali activation processes for incinerator residues management
Isabella Lancellotti1, Chiara Ponzoni, Luisa Barbieri
1Department of Engineering Enzo Ferrari, University of Modena and Reggio Emilia, Via Vignolese 905/A, 41125 Modena, Italy. isabella.lancellotti@unimore.it
Waste Management (New York, N.Y.)
|June 13, 2013
Summary
Incinerator bottom ash (BA) can be used to create dense geopolymers with high ash content. Accounting for the ash's reactive aluminosilicate fraction significantly impacts geopolymer properties like Si/Al ratio and microstructure.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- Incinerator bottom ash (BA) is a substantial waste product globally, with Italy generating 1.2-1.5 million tons annually.
- Utilizing BA in construction materials offers a sustainable solution for waste management and resource recovery.
Purpose of the Study:
- To investigate the production of dense geopolymers using high percentages (50-70 wt%) of incinerator bottom ash.
- To evaluate the impact of considering the reactive aluminosilicate fraction in BA on geopolymer properties.
Main Methods:
- Determination of the reactive aluminosilicate fraction in BA using NaOH dissolution tests.
- Synthesis and characterization of geopolymers incorporating varying amounts of BA.
- Comparison of geopolymer properties (Si/Al ratio, microstructure) with and without accounting for the reactive fraction.
Main Results:
- Geopolymers with 50-70 wt% BA were successfully produced.
- The presence of both amorphous and crystalline reactive fractions in BA influences geopolymer characteristics.
- Significant differences in Si/Al ratio and microstructure were observed when the reactive fraction of BA was considered.
Conclusions:
- Incinerator bottom ash is a viable precursor for geopolymer synthesis.
- Characterizing the reactive aluminosilicate content in BA is crucial for tailoring geopolymer properties.
- This approach enhances the understanding and application of BA-derived geopolymers.
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