Characteristics of Sintering Ash in Incinerator

Abstract

Annealed bottom ash from municipal waste incineration was characterized for metal leaching. Influence of temperature, oxygen concentration in the atmosphere and treatment time on leaching behavior was investigated. Concentration of lead and chromium (VI) increased as temperature and oxygen concentration in atmosphere rose. Prolongation of treatment time caused increase of lead leaching and degrease of chromium (VI). Sintering experiment of 4 particle-size groups classified by sieves revealed influence of particle size on lead and chromium leaching. The experiment also showed correlation among concentration of lead in leachate, pH of leachate and amount of Gehlenite in ash observed by XRD.