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 B2O3 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 SiO2 phase containing CaO occurred, not obtaining high SiO2 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 B2O3 content. After subsequent acid-treatment, colorless insoluble solids were successfully recovered. The end products consist of 70-90 mass% SiO2, 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.
| Original language | English |
|---|---|
| Pages (from-to) | 220-223 |
| Number of pages | 4 |
| Journal | Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan |
| Volume | 116 |
| Issue number | 1350 |
| Publication status | Published - Feb 2008 |
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Keywords
- Blast furnace slag
- Chemicalrecyeling
- Glass
- Phase separation
- Waste recycling
ASJC Scopus subject areas
- Ceramics and Composites
Cite this
Chemical recycling of inorganic wastes by using phase separation of glass. / Nanra, Tokuro; Mikami, Shuhei; Imaoka, Takuya; Sakida, Shinichi; Miura, Yoshinari.
In: Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, Vol. 116, No. 1350, 02.2008, p. 220-223.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Chemical recycling of inorganic wastes by using phase separation of glass
AU - Nanra, Tokuro
AU - Mikami, Shuhei
AU - Imaoka, Takuya
AU - Sakida, Shinichi
AU - Miura, Yoshinari
PY - 2008/2
Y1 - 2008/2
N2 - 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 B2O3 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 SiO2 phase containing CaO occurred, not obtaining high SiO2 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 B2O3 content. After subsequent acid-treatment, colorless insoluble solids were successfully recovered. The end products consist of 70-90 mass% SiO2, 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.
AB - 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 B2O3 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 SiO2 phase containing CaO occurred, not obtaining high SiO2 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 B2O3 content. After subsequent acid-treatment, colorless insoluble solids were successfully recovered. The end products consist of 70-90 mass% SiO2, 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.
KW - Blast furnace slag
KW - Chemicalrecyeling
KW - Glass
KW - Phase separation
KW - Waste recycling
UR - http://www.scopus.com/inward/record.url?scp=44649193764&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=44649193764&partnerID=8YFLogxK
M3 - Article
VL - 116
SP - 220
EP - 223
JO - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
JF - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
SN - 1882-0743
IS - 1350
ER -