Characteristics of MSWI Ash and its Application to Zeolite Synthesis

Abstract:

In this study, composition for bottom ash and fly ash of MSWI was analyzed and zeolite was synthesized in order to expand its recycling on high quality and mass consumption. Analysis of ash its characteristics was performed by XRF, XRD, SEM, EDX, TG/DTA. Bottom/fly ash was fired for elimination of unburned carbon at 750°C/12 hr, crushed and synthesized to zeolite in 1, 2, 3, 4, 5 M NaOH solutions under 105°C/24hr by hydrothermal method. Calcite and calcium-silicate compound was mainly contained in bottom ash and CaCl₂∙4H₂O, Ca (OH)₂, NaCl, and calcite and KCl in fly ash. Especially amount of Cl was much contained in fly ash due to Korean food waste characteristics. Bottom ash could synthesize Zeolites in form of sodalite under 3~4 M NaOH and fly ash could synthesize Zeolite A under 1~2 M NaOH. In addition, zeolite synthesized with bottom ash had higher specific surface area and zeolite from fly ash had higher CEC value. Accordingly, ash from MSWI could be recycled for further valuable uses such as non-point pollutant control and/or soil amendment.

• Periodical: Materials Science Forum (Volume 804)
• Pages: 93-96
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.804.93
• Online since: October 2014
• Authors: Yeong Seok Yoo, Jun Ho Jo
• Keywords: Ash Recycling, Bottom Ash, Fly Ash (FA), MSWI Ash, Zeolite Synthesis

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