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Effect of Composite Fluxing Agent on Melting Temperature and Phase of Fly Ash from Waste Incineration.
- Source :
- Bulletin of the Chinese Ceramic Society; Jun2024, Vol. 43 Issue 6, p2206-2216, 11p
- Publication Year :
- 2024
-
Abstract
- High temperature melting vitrification is the safest and harmless disposal technology for fly ash from hazardous waste incineration. Fly ash with high calcium content was used as the research object to melt fly ash with low temperature by introducing SiO<subscript>2</subscript>, H<subscript>3</subscript>BO<subscript>3</subscript> and CaF<subscript>2</subscript> fluxing agents. The melting temperature, phase change and heavy metal leaching of fly ash were characterized by X-ray diffractometer, ash melting point analyzer and inductively coupled plasma atomic emission spectrometer. The results show that when the alkalinity of fly ash is adjusted to 1.10 by SiO<subscript>2</subscript> (27.9%, mass fraction), CaSiO<subscript>3</subscript> minerals with low melting point are formed, and the melting point of fly ash decreases from above 1 400 °C to 1 300 °C. H<subscript>3</subscript>BO<subscript>3</subscript> (4.5%, mass fraction) and CaF<subscript>2</subscript> (7.0%, mass fraction) are introduced as fluxing agents, and the melting temperature is further reduced to 1 200 °C, but SiO<subscript>2</subscript> is overdoped. After optimization, the composite fluxing agent formula is SiO<subscript>2</subscript> (20.0%, mass fraction), H<subscript>3</subscript>BO<subscript>3</subscript> (4.5%, mass fraction) and CaF<subscript>2</subscript> (7.0%, mass fraction), and the minimum melting temperature of fly ash is 1 124 °C, the vitreous content of the melt product reaches 87% (mass fraction), and the harmful substances of acid leaching are lower than the limit value, meeting the technical requirements of GB/T 41015-2021 standard for vitrification products. [ABSTRACT FROM AUTHOR]
- Subjects :
- INCINERATION
FLY ash
HAZARDOUS waste incineration
MELTING points
MELTING
Subjects
Details
- Language :
- Chinese
- ISSN :
- 10011625
- Volume :
- 43
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Bulletin of the Chinese Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 177840969