Ceramics-Silikáty 55, (1) 94 - 99 (2011)
|THE ALUMINA-SILICATES IN STABILIZATION PROCESSES IN FLUIDIZED-BED ASH
|Hanzlíček Tomáš, Perná Ivana
| Institute of Rock Structure and Mechanics of the Academy of Sciences of the Czech Republic (IRSM AS CR), v.v.i.,
V Holesovickach 41, 182 09 Prague 8, the Czech Republic
|Keywords: Fluidized-Bed Ash (FBA), Ettringite, Al-coordination, Poly-condensation
Presented study of coal fluidized-bed ash solidification was accompanied with specific studies of alumino-silicates residues
in ashes. The specific technology of fluid coal burning and its relatively low temperature combustion combines coal burning
and decomposition of calcium carbonate added to the fluid layer in the main endeavor to capture all sulfur oxides.
The burning temperature seems be decisive to the behavior of clayed residues and calcium carbonate decomposition in
connection for the future solidification of fluidized bed ash. The calcareous substances in combination with alumino-silicate
residues form solid bodies where silicates play decisive role of long-term stability and insolubility of obtained solids. The
position of aluminum ions in clayed residues of burned coal were studied by MAS-NMR with attention on aluminum ion
coordination to oxygen and formation of roentgen amorphous phase of poly-condensed calcium alumina-silicate.
PDF (1.0 MB)