Chemical stability of geopolymers containing municipal solid waste incinerator fly ash |
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| Authors: | Isabella Lancellotti Elie Kamseu Marco Michelazzi Luisa Barbieri Anna Corradi Cristina Leonelli |
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| Institution: | 1. School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China;2. Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, Hunan 410083, China;3. Guangdong Jiana Energy Technology Co. Ltd., Qingyuan 513056, China;1. Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, 41125 Modena, Italy;2. Department of Industrial and Information Engineering, Second University of Napoli, Aversa, Italy;1. Sustainable Infrastructure Research and Development Center, Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand;2. Department of Applied Chemistry, Faculty of Science and Liberal Arts, Rajamangala University of Technology Isan, Nakhon Ratchasima 30000, Thailand;1. School of Environmental Science and Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan, Hubei 430074, China;2. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;1. School of Chemistry and Materials Engineering, Changshu Institute of Technology, No. 99, South 3rd Ring Road, Changshu 215500, China;2. Suzhou Key Laboratory of Functional Ceramic Materials, Changshu Institute of Technology, Changshu 215500, China;3. Nuclear Resources Engineering College, University of South China, 421001, China;1. College of Engineering, Peking University, Beijing 100871, PR China;2. School of Environmental Science and Engineering, Southern University of Science and Technology (SUSTech), Shenzhen 518055, PR China;3. Institute of Technology for Marine Civil Engineering, Shenzhen Institute of Information Technology, Shenzhen 518172, PR China |
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| Abstract: | Municipal solid waste incinerators every year produce tons of fly ashes which, differently from coal fly ashes, contain large amounts of toxic substances (heavy metals, dioxins, furans). The stabilization/solidification (S/S) technology known as geopolymerization is proposed with the purpose to bond physically and chemically incinerator fly ashes (IFA) in a solid matrix, in order to reduce pollutant mobility. The chemical stability of geopolymers with Si/Al ratio of 1.8–1.9 and Na/Al ratio of 1.0, synthesized by alkali activation of metakaolin and the addition of 20 wt% of two different kinds of IFA, is presented. The concentration of the alkaline solution, water to solid ratio and curing process have been optimized. The room temperature consolidation of IFA containing geopolymers has been tested for leachability in water for 1 day, accordingly to EN 12457 regulation and extended to 7 days to increase the water attack on solid granules. Leachable metals in the test solution, determined by ICP_AES, fall within limit values set by regulation for non-dangerous waste landfill disposal. Geopolymeric matrix evolution with leaching time has been also evaluated in terms of pH and electrical conductivity increase in solution. |
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