Production of synthetic stone from incinerator ash by slagging process
Date Issued
2004
Date
2004
Author(s)
Tseng, Chun-Chiao
DOI
zh-TW
Abstract
Abstract
Municipal solid waste incineration ashes from Pei-Tou refuse incineration plant were used to study the feasibility of producing synthetic stones by the slagging process. The influences of factors such as the ash basicity and temperature program on fusion characteristic of the ash and the morphology and properties of the slag were investigated.
Bottom ash could form slag with perfect glassy surface at 1350℃, but fly ash could not , either alone or mixed with bottom ash or SiO2. The resulting slags from bottom ash using different cooling rates (1~8℃/min) were glassy materials, but they tended to become crystalline as the cooling rate decreased. The slags had similar chemical and physical properties. The water adsorption capacity was from 0.04 to 1.61 wt.%. The values of Vickers hardness were from 5.8 to 7.3 GPa. The values of compressive strength were from 23.7 to 176.7 MPa. The compressive strengths of some slags are comparable to that of marble or granite；thus, the slags have the potential of being used as stones.
Washing the fly ash at a water to solid ratio of 1:100 resulting in a significant decrease in the weight loss of fly ash at 1350℃ and a decrease of about 30~35℃ in the pouring point of fly ash. The washing of fly ash is beneficial to the virtrification of fly ash, but the wastewater generated has to be treated to meet the effluent standards.
Subjects
熔渣
玻璃化
抗壓強度
焚化灰渣
Incineration ashes
Vitrification
Compressive strength
Slag
Type
thesis
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