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Hydrothermal Mechanism of Na-A Type Zeolite from Natural Siliceous Mudstone  

Bae, In-Kook (Korea Institute of Geoscience and Mineral Resources)
Jang, Young-Nam (Korea Institute of Geoscience and Mineral Resources)
Chae, Soo-Chun (Korea Institute of Geoscience and Mineral Resources)
Kim, Byoung-Gon (Korea Institute of Geoscience and Mineral Resources)
Ryu, Kyoung-Won (Korea Institute of Geoscience and Mineral Resources)
Lee, Sung-Ki (University Science and Technology)
Publication Information
Journal of the Mineralogical Society of Korea / v.20, no.3, 2007 , pp. 223-229 More about this Journal
Abstract
The mechanism of hydrothermally synthesizing Na-A zeolite from siliceous mudstone at a $Na_2O/SiO_2$ ratio of 0.6, a $SiO_2/Al_2O_3$ 2.0 and a $H_2O/Na_2O$ 119 has been observed by IR, DTA, XRD and SEM. This mudstone is a tertiary periodic sedimentary rock and widely spreads around the Pohang area. In the early hydrothermal synthesis at $80^{\circ}C$ in an autoclave, sodium silicate and sodium aluminate were found to be preferentially reacted to generate Na-A type zeolite. Gibbsite and bayerite were also formed due to the presence of extra aluminum oxide in the feedstock. As reaction time in-creased up to 50 h, residual sodium aluminatewas reacted with siliceous mudstone, causing the Na-A zeolite crystal to grow and the hydroxylsodalite to generate. Therefore, in the $14{\sim}50\;h$ synthetic time, Na-A zeolite and hydroxylsodalite were formed. Also, if reaction time passed over 50 h, a part of the Na-A zeolite was finally redissolved and reacted with hydroxylsodalite to synthesize Na-P zeolite, generating porous surface of Na-A zeolite and disappearing hydroxylsodalite.
Keywords
mechanism; siliceous mudstone; Na-A type zeolite; infrared spectroscopy; X-ray diffraction analysis; thermal analysis; scanning electron microscope;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
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