Effect of Accelerated Carbonation on the Mineral Phase of Alkaline Inorganic Waste

抄録

To effectively pre-treat the alkaline inorganic waste by carbonation reaction with CO₂, it is necessary to understand a mineralogical change. This is because mineralogical changes serve as an important key to leaching behavior or stabilization of heavy metals, such as Pb, Cu, Cr, and Ni, contained in the inorganic waste, at the point of environmental influence. Therefore, in this study we investigated the chemical composition and mineralogical characteristics of municipal solid waste incineration bottom ash, which is a type of alkaline inorganic waste, and the material changed by the carbonation reaction in bottom ash. In addition, minerals affected by carbonation reactions were identified based on the ternary diagram of Ca-Al-Si in bottom ash. The relationship between mineralogical changes caused by carbonation reactions and stabilization of heavy metals was also examined.