ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

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.


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