文章基本信息

标题：Behaviours of MeCl2 (Me: Pb and Cd) during thermal treatment of kaolin-lime mixture
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作者：Nabajyoti Saikia ; Toshinori Kojima
期刊名称：African Journal of Environmental Science and Technology
电子版ISSN：1996-0786
出版年度：2011
卷号：5
期号：10
页码：778-785
DOI：10.5897/AJEST11.029
语种：English
出版社：Academic Journals
摘要：This paper reports the emission behaviours of Pb and Cd during heat treatment of their chloride salts with kaolin-lime and kaolin-lime-silica mixtures. The leaching behaviours of Pb and Cd from the heat-treated products are also assessed. The results showed that the addition of lime into kaolin increased the emitted amounts of Pb and Cd during heating. Addition of silica into the mixtures further increased the emissions of both elements at low temperature (≤1000°C) and inhibited their emissions at high temperature (≥1100°C). Crystallinity of silica had profound effect on the emissions of Pb and Cd from the mixtures. The heat-treated product containing anorthite as the major crystalline phase not only retain more amounts of Pb and Cd in its composition but also emit lesser amounts of Pb and Cd into solution than the product containing gehlenite as the major crystalline phase during subjected leaching test.
关键词：Toxic element;kaolin; lime; silica; heat-treatment; leaching