向陽雲母水熱合成沸石及似長石礦物研究

Hydrothermal Synthesis of Zeolite and Feldspathoid Minerals from Hsiang-Yang Mica

何宗祐(T. Y. Ho) ； 雷大同(D. T. Ray)

《鑛冶：中國鑛冶工程學會會刊》 56卷2期 (2012/06) Pp. 37-48

https://doi.org/10.30069/MM.201206.0004

摘要

In this study, four Hsiang-Yang mica powders, as received, ground in a beads mill and classified into ＞10 μm and ＜2 μm samples were tested in hydrothermal reactions. Each of these samples was mixed and reacted with NaOH of three ranges of concentration at 240 °C. For each NaOH concentration range, the four Hsiang-Yang mica powders had the same dominant zeolite or feldsparthoid mineral products. For [NaOH] ≤ 1M, the product is analcime; for 1M＜[NaOH] ＜5M, hydroxycancrinite; and for [NaOH] ≥ 5M, hydroxysodalite. Hydroxycancrinite can be easily synthesized from ＞10 μm sample, which is composed of 70% pyrophyllite and 30% sericite. Hydroxysodalite can be easily synthesized from ＜2 μm sample, which is composed of 70% pyrophyllite and 30% sericite. At low NaOH concentrations, pyrophyllite always disappeared at a faster rate than sericite indicating pyrophyllite is more reactive than sericite. At high NaOH concentrations, there is no significant difference in reaction rate because the dissolution behaviors of the two minerals become similar.

關鍵字

絹雲母 ； 葉蠟石 ； 水熱反應 ； 沸石 ； 似長石礦物

並列摘要

In this study, four Hsiang-Yang mica powders, as received, ground in a beads mill and classified into ＞10 μm and ＜2 μm samples were tested in hydrothermal reactions. Each of these samples was mixed and reacted with NaOH of three ranges of concentration at 240 °C. For each NaOH concentration range, the four Hsiang-Yang mica powders had the same dominant zeolite or feldsparthoid mineral products. For [NaOH] ≤ 1M, the product is analcime; for 1M＜[NaOH] ＜5M, hydroxycancrinite; and for [NaOH] ≥ 5M, hydroxysodalite. Hydroxycancrinite can be easily synthesized from ＞10 μm sample, which is composed of 70% pyrophyllite and 30% sericite. Hydroxysodalite can be easily synthesized from ＜2 μm sample, which is composed of 70% pyrophyllite and 30% sericite. At low NaOH concentrations, pyrophyllite always disappeared at a faster rate than sericite indicating pyrophyllite is more reactive than sericite. At high NaOH concentrations, there is no significant difference in reaction rate because the dissolution behaviors of the two minerals become similar.

並列關鍵字

sericite ； pyrophyllite ； hydrothermal reaction ； zeolite ； feldspathoid minerals