(404c) Development and Deployment of Advanced Technology for Mswi Fly Ash Stabilization and Utilization Via High-Gravity Carbonation Process

The removal of chlorine and heavy metal in municipal solid wastes incineration (MSWI) fly ash is significant necessity before its utilization in cement kiln, ensuring the quality of cement products, maintenance of processing equipment, and the protection of environment. In addition, fly ash could be considered as a suitable material for CO2 mineralization due to high alkalinity, small particle size and high calcium content. In this presentation, we developed an integrated process to reduce the chlorine and heavy metal from MSWI fly ash coupled with the carbonation reaction and water-washing treatment in a high-gravity rotating packed bed. To indicate that the chlorine and heavy metal could be removed from carbonated fly ash, we evaluate the reaction mechanisms at mineral precipitation and leaching kinetic at liquid-solid interface. We also conducted the energy and mass balance to determine the optimal operation condition in this integrated process. Those findings could provide a novel treatment process for MSWI fly ash and broaden the utilization pathway in cement industry.