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ID 46903
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Author
Mikami, Shuhei
Imaoka, Takuya
Miura, Yoshinari
Abstract
A chemical recycling process using phase separation of glass was applied to a granulated blast furnace slag with high CaO content. Glasses were prepared by adding B(2)O(3) to the slag in order to promote phase separation, and the glasses were heat-treated above glass transition temperature. In the subsequent acid-treatment, however, gelation due to the elution of SiO(2) phase containing CaO occurred, not obtaining high SiO(2) solids. Then, pretreatment was introduced to reduce CaO content in slag, where the raw slag was briefly washed in acid. The slag glasses prepared from the pretreated slag were commonly phase-separated by heat-treatment regardless of B(2)O(3) content. After subsequent acid-treatment, colorless insoluble solids were successfully recovered. The end products consist of 70-90 mass% SiO(2), and coloring ions such as Mn, Fe and Cr were almost completely removed from the slag glasses. Reutilization as raw materials for glass is expected.
Keywords
Blast furnace slag
Waste recycling
Chemical recycling
Phase separation
Glass
Published Date
2008-02
Publication Title
Journal of the Ceramic Society of Japan
Volume
volume116
Issue
issue1350
Publisher
The Ceramic Society of Japan
Publisher Alternative
公益社団法人日本セラミックス協会
Start Page
220
End Page
223
ISSN
1882-0743
NCID
AA12229489
Content Type
Journal Article
language
英語
Copyright Holders
©2008 The Ceramic Society of Japan
File Version
publisher
Refereed
True
DOI