Reaction of tricalcium aluminate with hydrogen chloride under simulated bag filter conditions

Kouki Kasuya, Naomi Onodera, Atsushi Iizuka, Etsuro Shibata, Takashi Nakamura

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


The influence of metals present in fly ash on the dechlorination reaction that occurs at bag filters installed in municipal waste incinerators and melting furnaces has not been investigated previously. Tricalcium aluminate (3CaO·Al 2O 3, C 3A) is considered to be a precursor of complex oxychlorides, and its reaction with HCl was investigated in a gas flow reactor under simulated bag filter conditions (473 K, 1000 ppm HCl, 30 vol% H 2O, 5 vol% O 2). The molar chlorination ratio of C 3A leveled off at about 1 after 24 h. The chlorination reaction rate of C 3A was similar to that of calcium hydroxide (Ca(OH) 2). C 3A chlorination products had a mainly amorphous structure. Elemental mapping images of the surface of chlorinated C 3A indicated the likely generation of complex oxychlorides of calcium and aluminum. It is possible that complex oxychlorides are produced at bag filters from complex oxides generated in high-temperature incinerators.

Original languageEnglish
Pages (from-to)6987-6990
Number of pages4
JournalIndustrial & Engineering Chemistry Research
Issue number19
Publication statusPublished - 2012 May 16


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