Novel solidification/stabilization matrices for safe landfill by utilizing MSWI fly ash
利用MSWI飞灰构建新型填埋固化基质的研究

The possibilities of MSWI fly ash as major constituent of novel solidification/stabilization matrices for safe landfill have been explored by mixing MSWI fly ash with aluminum- silicon component to form Friedel and ettringite phases with high fixing capacities for heavy metals. The physical properties, heavy metalsfixing capacity, mineral phases and its vibration bands in the new matrices have been characterized by compressive strength, TCLP, XRD and DTG and FTIR respectively. The sequential extraction procedure was used to analyses the fractions of chemical speciation for Pb, Cd and Zn ions. The result indicates that new S/S matrices can incorporate Pb, Cd and Zn ions effectively by physical encapsulation and chemical fixation, and they exhibit a great potential in co-landfill treatment of MSWI fly ash with other heavy metals-bearing hazardous wastes.