火山作用と関係ある無定形ケイ酸の性質とその応用的研究-23・27-

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The mixtures of CaO and SiO_2 (mol ratio 1 : 1, 2: 3, 2: 1 and 3 : 2) were heated 0.5-3 hrs. at 1000°C-1250°C and cooled gradually in the muffle furnace or quenched in ice water. The solubility of SiO_2 to N/2-HCl of those samples 3 hrs. heated at 1000°C was 3.24-6.85%, and 1100V 4.46-8.66%, but at 1250°C it rapidly increased up to 14.16-14.35%. Moreover, it was seemed that the solubility to N/2-HCl of those samples cooled gradually in the muffle furnace was greater than the samples quenched in ice water. At the observation of relation between those formed compounds and their solubility by the application of X-ray test to those samples, β-2CaO.SiO_2, γ-2CaO.SiO_2, CaO.SiO_2(?), cristobalite, CaCO_3 and Ca(OH)_2 were found existing.
鹿児島大学,カゴシマダイガク,Kagoshima Universityの論文