Stabilization of the ammonia in SNCR fly ash - the influence of tannins presence on the preparation of an autoclaved aerated concrete

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26310%2F19%3APU131107" target="_blank" >RIV/00216305:26310/19:PU131107 - isvavai.cz</a>
Result on the web
<a href="https://iopscience.iop.org/article/10.1088/1757-899X/583/1/012020" target="_blank" >https://iopscience.iop.org/article/10.1088/1757-899X/583/1/012020</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1757-899X/583/1/012020" target="_blank" >10.1088/1757-899X/583/1/012020</a>

Result language
angličtina
Original language name
Stabilization of the ammonia in SNCR fly ash - the influence of tannins presence on the preparation of an autoclaved aerated concrete
Original language description
Thanks to the legislative regulations on NOx emissions, a selective non-catalytic reduction (SNCR) technology had been introduced to a coal combustion process in power plants. The valuable by-product, fly ash, contains ammonia in the form of soluble salts, e.g. NH4HSO4 and (NH4)2SO4. After mixing SNCR fly ash with cement, thanks to the rise of pH, the toxic ammonia releases and contaminates the working area, so the presence of these salts is undesirable in an autoclaved aerated concrete (AAC) manufacturing process. A possible solution is the conversion of soluble ammonium salts to an insoluble form. Tannins are a class of polyphenolic biomolecules, which react with the ammonium ions to form insoluble compounds. The AAC samples were mixed using SNCR fly ash and two different ammonium binding additives - pure tannic acid and the cost-effective animal food supplement containing chestnut tannins. The influence of additives on the hydration process of the starting mixture was studied by isoperibolic calorimetry. The results suggest that the cost-effective source of tannins retards the hydration. The presence of insoluble compounds was studied by the infrared spectroscopy.
Czech name
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Czech description
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Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
International Conference Building Materials, Products and Technologies 4–6 June 2019, Lednice, Czech Republic
ISBN
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ISSN
1757-8981
e-ISSN
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Number of pages
8
Pages from-to
1-8
Publisher name
IOP Publishing
Place of publication
Lednice
Event location
Lednice
Event date
Jun 4, 2019
Type of event by nationality
EUR - Evropská akce
UT code for WoS article
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