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Characteristics and so 2 capture capacities of sorbents prepared from products of spray‐drying flue gas desulfurization
Author(s) -
Ho Ch'UnSung,
Shih ShinMin
Publication year - 1993
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450710615
Subject(s) - fly ash , flue gas desulfurization , sorbent , flue gas , chemistry , inert , ettringite , inert gas , nuclear chemistry , waste management , materials science , adsorption , metallurgy , organic chemistry , cement , engineering , portland cement
The characteristics and the SO 2 capture capacities of sorbents prepared from products of spray‐drying flue gas desulfurization (FGD) have been studied. Sorbents were prepared by first slurrying Ca(OH) 2 and CaSO 3 and/or CaSO 4 with and without the addition of fly ash and then drying. Compared to the use of pure Ca(OH) 2 , the SO 2 capture and Ca(OH) 2 utilization decreased for sorbents prepared without fly ash and increased for sorbents with fly ash. Flakelike ill‐crystallized tobermorites were observed for all the sorbents containing fly ash. In addition, significant amounts of needle‐shape Ca 4 Al 2 (OH) 12 SO 4 . 6H 2 O and Ca 6 Al 2 (OH) 12 (SO 4 ) 3 . 26H 2 O (ettringite) were also observed for the sorbents containing CaSO 3 and/or CaSO 4 . These newly formed compounds dissociated into CaSO 3 . 0.5 H 2 O and inert precursors upon sulfation, and were responsible for the high SO 2 capture capacities and Ca(OH) 2 utilizations of the sorbents prepared with fly ash.