Studies on rheological and leaching characteristics of heavy metals through selective additive in high concentration ash slurry

► The ash slurry is proposed as Bingham-plastic at high solids concentration. ► The pH of ash slurry improved with the addition of sodium silicate. ► The yield stress and plastic viscosity of ash slurry reduced with the additive. ► Pb, Zn and Cu are most abundant elements in the trace element analysis. ► The leaching of As and Hg reduces significantly after 300 days with the additive.