TY - JOUR
T1 - Effect of the Silicate Skeleton Structure on the Dissolution Kinetics of Calcium Silicate Mineral Phases in Water
AU - Ruan, Fang
AU - Kawanishi, Sakiko
AU - Sukenaga, Sohei
AU - Shibata, Hiroyuki
N1 - Funding Information:
This work was financially supported in part by a Grant-in-Aid for Scientific Research (B) Grant (No. 19H02487) from the Japan Society for the Promotion of Science (JSPS). The authors would like to thank Ms. Shishido (Tohoku University) for technical support in ToF-SIMS analysis. The authors would also like to thank Prof. Nagasako and Mr. Ito (Tohoku University) for their help with the TEM observations.
Publisher Copyright:
© 2021, The Minerals, Metals & Materials Society and ASM International.
PY - 2021/4
Y1 - 2021/4
N2 - Environmental hazards due to alkali elution can be mitigated by investigating the dissolution kinetics of calcium silicate mineral phases in water. This study demonstrated the effect of the silicate skeleton structure on the dissolution kinetics of calcium silicate mineral phases in water. The time dependence of the Ca-Si relative release ratio during leaching indicated the preferential elution of Ca to Si in the initial stage of dissolution. The formation of a Ca-depleted layer on the surface of the leached sample was confirmed by X-ray photoelectron spectroscopy and time-of-flight secondary-ion mass spectrometry. The elution kinetics of Ca and Si were determined by the semi-infinite diffusion model and the detachment reaction of the intermediate phase that was formed on the surface of the mineral by hydration, respectively. Furthermore, the nanoscale intermediate phase was observed by transmission electron microscopy. The diffusion coefficient of Ca in the leached layer and the reaction-rate coefficient of Si were obtained from the elution kinetics of Ca and Si, respectively, and these decreased with the increase in the degree of polymerization of the silicate skeleton structure that varied in the following sequence: calcio-olivine (γ-Ca2SiO4) > rankinite (Ca3Si2O7) ≈ wollastonite (β-CaSiO3) > pseudowollastonite (α-CaSiO3).
AB - Environmental hazards due to alkali elution can be mitigated by investigating the dissolution kinetics of calcium silicate mineral phases in water. This study demonstrated the effect of the silicate skeleton structure on the dissolution kinetics of calcium silicate mineral phases in water. The time dependence of the Ca-Si relative release ratio during leaching indicated the preferential elution of Ca to Si in the initial stage of dissolution. The formation of a Ca-depleted layer on the surface of the leached sample was confirmed by X-ray photoelectron spectroscopy and time-of-flight secondary-ion mass spectrometry. The elution kinetics of Ca and Si were determined by the semi-infinite diffusion model and the detachment reaction of the intermediate phase that was formed on the surface of the mineral by hydration, respectively. Furthermore, the nanoscale intermediate phase was observed by transmission electron microscopy. The diffusion coefficient of Ca in the leached layer and the reaction-rate coefficient of Si were obtained from the elution kinetics of Ca and Si, respectively, and these decreased with the increase in the degree of polymerization of the silicate skeleton structure that varied in the following sequence: calcio-olivine (γ-Ca2SiO4) > rankinite (Ca3Si2O7) ≈ wollastonite (β-CaSiO3) > pseudowollastonite (α-CaSiO3).
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U2 - 10.1007/s11663-021-02079-9
DO - 10.1007/s11663-021-02079-9
M3 - Article
AN - SCOPUS:85101249026
SN - 1073-5615
VL - 52
SP - 1071
EP - 1084
JO - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
JF - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
IS - 2
ER -