소각재를 이용한 geopolymer 제조시 금속이온의 영향

초록

Geopolymer possesses excellent mechanical properties, such as fire resistance and chemical resistance. Geopolymer technology can be used to enhance the recyclability of municipal solid waste incinerator (below MSWI) ash. Alkaline activator is necessary to synthesize geopolymeric material as alumino-silicate source, forming a gel binder phase. Because its structure has the polymeric Si-O-Al framework (sialate), with SiO_4 and AlO_4 tetrahedral linked alternatively by sharing all the oxygen atoms. Geopolymerization process is composed of dissolution, migration and polymerization of Al and Si precursor species. MSWI ash contains various hazardous elements such as easily leachable heavy metal, soluble salts and organic compounds. These components affect the physical property of geopolymer, if MSWI ash is used as raw material. In this work, we discuss the effect of metal compounds leached out from MSWI ash particles after mixing with alkaline solution on the physical property of it. These results are thought to enhance these results enhance the recyclability of waste material, such as MSWI ash.

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