焚化灰渣熔融處理石材化技術開發研究

Production of synthetic stone from incinerator ash by slagging process

曾俊僑(Chun-Chiao Tseng)

指導教授 ： 施信民

國立臺灣大學/工學院/化學工程學研究所/碩士(2004年)

https://doi.org/10.6342/NTU.2004.00114

摘要

本研究以採集自北投焚化爐廠的焚化灰渣探討焚化灰渣高溫熔融處理石材化的可行性。研究中探討鹽基度、溫度控制等變數對灰渣熔融特性、熔渣晶相及物理與化學性質的影響。
在1350℃下底灰可得到完整玻璃化表面的熔渣，但飛灰不論單獨存在、添加底灰或添加SiO2，皆無法得到。底灰以1至8℃/min不同降溫速率所產生的熔渣為玻璃狀態，在低降溫速率下有少量的結晶出現；化學及物理性質差異不大，其吸水率在0.04~1.61wt.%，Vickers硬度在5.8~7.3 GPa間，抗壓強度在23.7~176.7 MPa間；部份熔渣之抗壓強度可達大理石、花崗岩之範圍，具備石材化潛力。
飛灰以固液比1:100水洗後，大幅降其Cl含量及重量損失率，且熔流溫度下降約30-35℃，增加飛灰熔融處理的可行性，但其水洗液污染物含量超過放流水標準。

關鍵字

熔渣 ； 玻璃化 ； 抗壓強度 ； 焚化灰渣

並列摘要

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.

並列關鍵字

Incineration ashes ； Vitrification ； Compressive strength ； Slag

參考文獻

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