セメントキルンから発生するKパウダーのキャラクタリゼーション

第1報　Ｋパウダーの主要鉱物および粉体特性

抄録

Recently, many kinds of aversive substances (chlorides, alkalies, sulfurs and heavy metals) are brought into cement manufacturing process as raw materials, and they are usually removed by chlorine bypass system from cement kiln-preheater, which is called as "K powder" . Since "K powder" contains not only aversive substances but also cement constituents, its character has been expected to be clarified. In this study, we carried out the analyses on mineralogical and powder properties of "K powder" . As a result, we confirmed that "K powder" was composed mainly of CaO, KCl, CaSO₄ and Pb₁₀(SiO₄)₃(SO₄)₃Cl₂, and its median size was approx. 12 μm, and that "K powder" had a tendency that volatile and heavy metal constituents were concentrated in the size range under 10 μm, and cement constituents were concentrated in 10-44 μm size range. However, volatile and heavy metal constituents were cohesive and adhered to cement constituents, then, it is thought to be difficult to separate specific minerals from each other in the "K powder" by particle size in dry process.