CaCl2 Addition Effect and Melt Formation in Low-Temperature Decomposition of Chrysotile with CaCO3
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- FUJISHIGE Masao
- Department of Chemistry and Materials Science, Institute of Gunma National College of Technology
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- SATO Ryota
- Advanced Environmental Engineering Course, Institute of Gunma National College of Technology
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- KURIBARA Ayano
- Department of Chemistry and Materials Science, Institute of Gunma National College of Technology
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- KARASAWA Ikuko
- Department of Chemistry and Materials Science, Institute of Gunma National College of Technology
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- KOJIMA Akira
- Department of Chemistry and Materials Science, Institute of Gunma National College of Technology
Bibliographic Information
- Other Title
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- Chrysotile の低温分解における CaCl<sub>2</sub> 添加効果と融体形成
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Abstract
Mixtures of chrysotile (Mg6Si4O10(OH)8) and CaCO3 were burned at temperatures ranging from 500°C to 1000°C; the decomposition temperature of chrysotile was lowered by adding CaCl2. Thermal analysis and succeeding SEM observation confirmed the formation of melts, which was supposed to be responsible for the effect of the added CaCl2. The melts were detected even when the added CaCl2 was as little as 1-5 mass% of the CaCO3; the quantity of the CaCl2 was smaller than that predicted from the phase diagram. Thermodynamic calculations of chemical equilibrium showed that forsterite (Mg2SiO4), which was a thermal decomposition product of chrysotile and had a fibrous shape, destructed at about 500°C. In the common decomposition methods to convert asbestos-cement composites to oxides of Ca-Si system, the decomposition reaction occurs via a solid-solid reaction and reacts slowly. So to increase the reaction rate, a reaction temperature above 1000°C is required. The present study has experimentally evidenced that the formation of melts enlarges the reaction interface between the chrysotile and the CaCO3 so that the decomposition reaction can proceed even at lower temperatures.<br>
Journal
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- Journal of the Ceramic Society of Japan
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Journal of the Ceramic Society of Japan 114 (1334), 844-848, 2006
The Ceramic Society of Japan
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Details
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- CRID
- 1390001205277213824
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- NII Article ID
- 110004839580
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- NII Book ID
- AN10040326
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- ISSN
- 18821022
- 09145400
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- NDL BIB ID
- 8536680
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed