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Behavior of Na-A Type Zeolite from Melting Slag in its Hydrothermal Synthesis  

Lee, Sung-Ki (University of Science and Technology)
Bae, In-Koon (Korea Institute of Geoscience & Mineral Resources)
Jang, Young-Nam (Korea Institute of Geoscience & Mineral Resources)
Chae, Soo-Chun (Korea Institute of Geoscience & Mineral Resources)
Ryu, Kyoung-Won (Korea Institute of Geoscience & Mineral Resources)
Publication Information
Resources Recycling / v.17, no.4, 2008 , pp. 57-65 More about this Journal
Abstract
The behavior of Na-A type zeolite formed in hydrothermal synthesis of melting slag from municipal incineration ash has been investigated with varying synthesis time and $SiO_2/Al_2O_3$ ratio. Sodium silicate and sodium aluminate feed was found to initially form nuclei of Na-A type zeolite in the behavioral study of the reaction products with different synthesis times. As the synthesis time increased, the nuclei have grown to Na-A type zeolite crystals by reacting with $SiO_2$ and $Al_2O_3$ dissolved from the melting slag. The hydrothermal synthesis was completed in 10 hr in the $SiO_2/Al_2O_3$ ratio of 1.38 and after that time, the Na-A type zeolite formed was dissolved and transformed into hydroxysodalite. Only Na-A type zeolite was formed in the $SiO_2/Al_2O_3$ ratio ranging 0.80 to 1.96, whereas Na-P type zeolite as well as Na-A type was formed in the $SiO_2/Al2O_3$ ratio of 2.54.
Keywords
melting slag; Na-A type zeolite; reaction time; Na-P type zeolite; hydroxysodalite;
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Times Cited By KSCI : 4  (Citation Analysis)
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