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J. Korean Ceram. Soc. > Volume 41(9); 2004 > Article
Journal of the Korean Ceramic Society 2004;41(9): 642.
doi: https://doi.org/10.4191/kcers.2004.41.9.642
Effect of Silicate Ions on the Hydration of 4CaO · Al2O3 · Fe2O3 with Gypsum
Kwang-Suk You, Ji-Whan Ahn, Hwan Kim1, Seishi Goto2
Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources
1Material Science and Engineering, Seoul National University
2Graduate School of Medicine, Medical Engineering and Science, Yamaguchi University
Na$_2$Si$_2$O$_{5}$ added to the solution affects the hydration of 4CaOㆍAl$_2$O$_3$ㆍFe$_2$O$_3$ with calcium sulfate. The reaction between 4CaOㆍAl$_2$O$_3$ Fe$_2$O$_3$and CaSO$_4$ㆍ 2$H_2O$ decrease with increasing amount of Na$_2$Si$_2$O$_{5}$ in solution, owing to low hydraulic reactivity of 4CaOㆍAl$_2$O$_3$ㆍFe$_2$O$_3$by the adsorption of silicate ions on the surface of 4CaOㆍAl$_2$O$_3$ㆍ Fe$_2$O$_3$ particles. The dissolution rate of 4CaOㆍAl$_2$O$_3$ㆍ Fe$_2$O$_3$ particles deceased with the increase of the concentration of silicate ion in solution. When the 4CaOㆍAl$_2$O$_3$ㆍFe$_2$O$_3$ particles was hydrated in gypsum - Na$_2$Si$_2$O$_{5}$ solution, the hydration was retarded and the rate could not discriminate between formation of ettringite and that of monosulfate, and it stopped in high concentration of silicate ions. However, silicate ion did not any effect on the dissolution rate of gypsum.ypsum.
Key words: Calcium alumino-ferrite, Hydration reaction, Sodium silicate
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