TW法によるネフェリンの合成

概要

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Nepheline was synthesized by the TW method. As the starting solution, each aqueous solution of NaNO3 and Al(NO3)39H2O was dissolved in proper amount of distilled water. The constant quantity of Si(OC2H5)4(TEOS) and a small amount of 2M-HCl as catalysis were mixed into the starting solution. A part of NaNO3 was also replaced by KNO3. Nepheline began to form at a certain temperature near 800°C. It was thought that nepheline was produced by a phase transformation of the low-carnegieite under the condition of decreasing of its component. It was also thought that nepheline may be formed by phase transformation of the low-carnegieite in preference to the formation of high-carnegieite through its modification at a certain temperature between 800°C and 900°C, and at a given composition with KNO3 of 15 mole%. In a sample obtained by heating the gel No.7 prepared by replacing the part of NaNO3 of 4.49 × 10-2 mole with KNO3 of 1.35 × 10-2 mole at 1100°C for 30 min, the pure nepheline in a single phase was obtained.
社団法人粉体粉末冶金協会の論文
2005-05-15