Abstract
A chemical recycling process of inorganic wastes has been developed, where after vitrifying wastes, the glasses were heat-treated and soaked in an acid, obtaining colorless and transparent SiO2-abundant glasses. In the present study, distribution behavior of the constituents such as Si, P, Ti, Al and so on present in a municipal waste slag was examined. According to compositional analyses, the recovered solids after acid treatment consisted of SiO2, P2O5 and TiO2, suggesting the preferential distribution of P and Ti atoms into SiO2-rich phase during phase separation. In high resolution microscopic analyses, however, it was observed that P and Ti atoms were distributed separately from Si atoms, and they were present in the different particles insoluble in the acid. It was finally concluded that the insoluble solids were produced by a dissolution-reprecipitation process, that is, once all the constituents of the vitrified slag were dissolved in the acid, P2O5 and TiO2 coprecipitated as particles, and TiO2 was indispensable for the precipitation of P2O5. SiO2 also precipitated as particles separately from P- and Ti-containing particles.
| Original language | English |
|---|---|
| Pages (from-to) | 108-113 |
| Number of pages | 6 |
| Journal | Journal of Asian Ceramic Societies |
| Volume | 1 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2013 |
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Keywords
- Chemical recycling of wastes
- Dissolution-reprecipitation
- Elemental mapping
- Glass
- Phase separation
ASJC Scopus subject areas
- Ceramics and Composites
Cite this
Distribution behavior of inorganic constituents in chemical recycling processes of a municipal waste slag. / Omura, Kohei; Sakida, Shinichi; Benino, Yasuhiko; Nanba, Tokuro.
In: Journal of Asian Ceramic Societies, Vol. 1, No. 1, 2013, p. 108-113.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Distribution behavior of inorganic constituents in chemical recycling processes of a municipal waste slag
AU - Omura, Kohei
AU - Sakida, Shinichi
AU - Benino, Yasuhiko
AU - Nanba, Tokuro
PY - 2013
Y1 - 2013
N2 - A chemical recycling process of inorganic wastes has been developed, where after vitrifying wastes, the glasses were heat-treated and soaked in an acid, obtaining colorless and transparent SiO2-abundant glasses. In the present study, distribution behavior of the constituents such as Si, P, Ti, Al and so on present in a municipal waste slag was examined. According to compositional analyses, the recovered solids after acid treatment consisted of SiO2, P2O5 and TiO2, suggesting the preferential distribution of P and Ti atoms into SiO2-rich phase during phase separation. In high resolution microscopic analyses, however, it was observed that P and Ti atoms were distributed separately from Si atoms, and they were present in the different particles insoluble in the acid. It was finally concluded that the insoluble solids were produced by a dissolution-reprecipitation process, that is, once all the constituents of the vitrified slag were dissolved in the acid, P2O5 and TiO2 coprecipitated as particles, and TiO2 was indispensable for the precipitation of P2O5. SiO2 also precipitated as particles separately from P- and Ti-containing particles.
AB - A chemical recycling process of inorganic wastes has been developed, where after vitrifying wastes, the glasses were heat-treated and soaked in an acid, obtaining colorless and transparent SiO2-abundant glasses. In the present study, distribution behavior of the constituents such as Si, P, Ti, Al and so on present in a municipal waste slag was examined. According to compositional analyses, the recovered solids after acid treatment consisted of SiO2, P2O5 and TiO2, suggesting the preferential distribution of P and Ti atoms into SiO2-rich phase during phase separation. In high resolution microscopic analyses, however, it was observed that P and Ti atoms were distributed separately from Si atoms, and they were present in the different particles insoluble in the acid. It was finally concluded that the insoluble solids were produced by a dissolution-reprecipitation process, that is, once all the constituents of the vitrified slag were dissolved in the acid, P2O5 and TiO2 coprecipitated as particles, and TiO2 was indispensable for the precipitation of P2O5. SiO2 also precipitated as particles separately from P- and Ti-containing particles.
KW - Chemical recycling of wastes
KW - Dissolution-reprecipitation
KW - Elemental mapping
KW - Glass
KW - Phase separation
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UR - http://www.scopus.com/inward/citedby.url?scp=85024951438&partnerID=8YFLogxK
U2 - 10.1016/j.jascer.2013.03.003
DO - 10.1016/j.jascer.2013.03.003
M3 - Article
VL - 1
SP - 108
EP - 113
JO - Journal of Asian Ceramic Societies
JF - Journal of Asian Ceramic Societies
SN - 2187-0764
IS - 1
ER -