Publication detail

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

GALVÁNKOVÁ, L. LÉDL, M. BERANOVÁ, D. OPRAVIL, T.

Original Title

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

Type

conference paper

Language

English

Original Abstract

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.

Keywords

SNCR, fly ash, tannins

Authors

GALVÁNKOVÁ, L.; LÉDL, M.; BERANOVÁ, D.; OPRAVIL, T.

Released

14. 8. 2019

Publisher

IOP Publishing

Location

Lednice

ISBN

1757-8981

Periodical

IOP Conference Series: Materials Science and Engineering

Year of study

583

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

8

Pages count

8

URL

https://iopscience.iop.org/article/10.1088/1757-899X/583/1/012020

Full text in the Digital Library

http://hdl.handle.net/11012/180693

BibTex

@inproceedings{BUT155527,
  author="Lucie {Dlabajová} and Matěj {Lédl} and Denisa {Beranová} and Tomáš {Opravil}",
  title="Stabilization of the ammonia in SNCR fly ash - the influence of tannins presence on the preparation of an autoclaved aerated concrete",
  booktitle="International Conference Building Materials, Products and Technologies
4–6 June 2019, Lednice, Czech Republic",
  year="2019",
  journal="IOP Conference Series: Materials Science and Engineering",
  volume="583",
  number="1",
  pages="1--8",
  publisher="IOP Publishing",
  address="Lednice",
  doi="10.1088/1757-899X/583/1/012020",
  issn="1757-8981",
  url="https://iopscience.iop.org/article/10.1088/1757-899X/583/1/012020"
}