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Lead generation and separation mechanisms from lead silicate glass by reduction-melting
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- INANO Hiroyuki
- Industrial Research Institute, Hokkaido Research Organization
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- TOMITA Keiichi
- Industrial Research Institute, Hokkaido Research Organization
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- TADA Tatsumi
- Industrial Research Institute, Hokkaido Research Organization
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- HIROYOSHI Naoki
- Graduate School of Engineering, Hokkaido University
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Description
Reduction-melting is a method to separate lead from waste cathode ray tube (CRT) lead glass. To study the mechanism of lead separation, melting tests using model lead silicate glass rather than actual CRT glass were carried out. Crushed model lead glass mixed with activated carbon (reducing agent) and Na2CO3 (flux) was heated and quenched at target temperatures to stop the reaction. Tomographic images of the quenched samples were observed by X-ray computed tomography. Further, the samples were evaluated by X-ray diffractometer, X-ray fluorescence spectrometer, and mass change determinations. From these results, it was found that reduction of lead glass and separation of lead occur with the following mechanisms. Elemental Pb (lead) was generated from below 973 K before the sample had melted completely. At 1273 K and above, whole of the sample had become a melt, and the Pb separated and settled out of the glass. Gas released during the melting process agitate the melt and promote the Pb settling.
Journal
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- Journal of the Ceramic Society of Japan
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Journal of the Ceramic Society of Japan 126 (8), 595-601, 2018-08-01
The Ceramic Society of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390845712980384384
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- NII Article ID
- 130007428937
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- ISSN
- 13486535
- 18820743
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
- OpenAIRE
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- Abstract License Flag
- Disallowed