一般廃棄物焼却灰からの脱塩素化プロセスの開発へ向けた粉砕によるフリーデル氏塩の改変効果

抄録

In order to facilitate to reuse on municipal waste incinerator ash, we should establish the dechlorinating technologies which includes insoluble materials like Friedel’s salt washout. In this study, we investigated the Cl ion solubility properties on our synthesized Friedel’s salt in the planetary mill experiments, and have recognized there are two stages of Cl ion soluble procedure which the rapid soluble phenomenon in early stage and the moderate soluble process in after middle. The rapid soluble phenomenon includes the crystal decreasing of Friedel’s salt but it has not been recognized significant XRD profile changes in the moderate process. It seems that some parts of released Cl ions which has migrated and been trapped into 3CaO·Al₂O₃ phase, will dissolve into the water in the moderate process. From the kinetics analysis, its dissolving Cl ion amounts has been affected by operated milling energy. Moreover, dissolved Cl ion amounts which derived from the milled Friedel’s salt samples has shown remarkably increasing in carbonating solvent contains HCO₃⁻ ion. It’s possible to understand that the milling procedure and the carbonization technique are much important for dechlorinating processing.