Effect of the Silicate Structure on Calcium Elution Behaviors of Calcium-silicate Based Mineral Phases in Aqueous Solution

Abstract

In this study, the effect of the silicate structure of calcium-silicate based mineral phases on their Ca elution behaviors into water was investigated. The Ca elution behaviors of Ca-silicate based mineral phases with different skeleton silicate structures in ion-exchanged water were analyzed using the powder leaching test. The elution amount of Ca was in the order alite (Ca₃SiO₅) > belite (γ-Ca₂SiO₄) > rankinite (Ca₃Si₂O₇) > pseudowollastonite (α-CaSiO₃) > wollastonite (β-CaSiO₃) ≈ cuspidine (Ca₄Si₂O₇F₂) > diopside (CaMgSi₂O₆) > hedenbergite (CaFeSi₂O₆) > tremolite (Ca₂Mg₅Si₈O₂₂(OH)₂) > anorthite (CaAl₂Si₂O₈). This suggests that the elution amount of Ca decreased with the skeleton silicate structure became more complicated.