CO_2存在下でのCaAl_2O_4の水和挙動

概要

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The hydration behavior of CaAl_2O_4 in the presence of CO_2 was studied. The hydration was conducted by suspending CaAl_2O_4 in water into which CO_2 gas was bubbled. In 100% CO_2, an almost insoluble coating, a reaction product of carbonic acid and CaAl_2O_4, was formed on CaAl_2O_4, surface. Therefore, the hydration of CaAl_2O_4 did not proceed. In this system, the solubility product which was determined from the concentrations of Ca^<2+> + and CO_3^<2-> agreed with that of CaCO_3.When the hydration was carried out at pH 9.5 or above in a buffer solution, this coating was broken by the dissolution of aluminum and thus the hydration proceeded. The reaction of CO_2 with calcium aluminate solution yielded the amorphous products containing amorphous CaCO_3. Their composition (by molar ratio) was as follows ; CaO : Al_2O_3 : CO_2 : H_2O=1.0 : 2.4 : 1.1 : 17.1.
社団法人日本セラミックス協会の論文
1990-12-01