Abstract
To promote the recycling of incineration ash for cement material, chloride concentration in the ash should be kept low level, because the acceptable ash has been limited by the capacity of the chlorine bypass system in the cement clinker production process. In this study, removing chloride from municipal solid waste incineration ashes by aqueous washing has been examined. The results show that water soluble chloride removes from ash to solution easily, the Friedel’s salt (3CaO-Al2O3-CaCl2-10H2O), however, difficult to remove and contents of Friedel’s salt percentages are 20-36% in bottom ash and 23% in fly ash. It is also shown that the behavior of heavy metals such as Cr, Cu, Zn, Cd, Hg, Pb, in rinsing process has been studied. Furthermore, the closed regeneration system of rinsed aqueous waste has been discussed.
