Recovery of cenospheres and fine fraction from coal fly ash by a novel dry separation method
Authors:
- Jan Wrona,
- Witold Żukowski,
- Dariusz Bradło,
- Piotr Czupryński
Abstract
Aluminosilicate microspheres are a valuable fraction of coal fly ash with diverse application due to its low density. Currently, there is no efficient and ecologically rational method of cenospheres recovery from fly ash. A combination of dry methods for the recovery of both fine ash particles and aluminosilicate microspheres from coal fly ash is presented. It is comprised of fluidised bed separation followed by screening and pneumatic separation in a free-fall air chamber. Fluidised bed separation was assisted by a mechanical activator to prevent agglomeration. This step reduced the portion of material that required further treatment by 52–55 wt.%, with the recovery of microspheres exceeding 97%. Then, the concentrates were individually subjected to pneumatic separation. The final separation product for the fly ash containing 0.64 wt.% cenospheres was a cenosphere concentrate which constituted about 17 wt.% of the initial fly ash. The recovery of cenospheres was around 81%. Usage of a combination of dry methods allowed for remaining of almost 83 wt.% of the raw material in its dry form. Furthermore, produced fly ash grain fractions could be used for different industrial purposes.
- Record ID
- CUT2c92f14c16a9451f832337542eca8ae8
- Publication categories
- ;
- Author
- Journal series
- Energies, ISSN , e-ISSN 1996-1073, Biweekly
- Issue year
- 2020
- Vol
- 13
- No
- 14
- Pages
- [1-14]
- Article number
- 3576
- Other elements of collation
- fot.; rys.; schem.; tab.; Bibliografia (na s.) - 13-14; Bibliografia (liczba pozycji) - 39; Oznaczenie streszczenia - Abstr.; Numeracja w czasopiśmie - Vol. 13, Iss. 14
- Substantive notes
- Special Issue: Advanced Mathematical Modeling Technology for Heat Storage and Conversion Systems
- Keywords in English
- fly ash, cenospheres, fluidisation, pneumatic separation
- DOI
- DOI:10.3390/en13143576 Opening in a new tab
- URL
- https://www.mdpi.com/1996-1073/13/14/3576/htm Opening in a new tab
- Language
- eng (en) English
- License
- Score (nominal)
- 140
- Publication indicators
- = 13
- Additional fields
- Indeksowana w: Web of Science, Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUT2c92f14c16a9451f832337542eca8ae8/
- URN
urn:pkr-prod:CUT2c92f14c16a9451f832337542eca8ae8
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.