垃圾焚烧飞灰电弧炉熔渣微晶玻璃的晶化行为

将垃圾焚烧飞灰与适量废玻璃粉混合后用电弧炉熔融处理,产生的水冷熔渣进一步粉碎、压型并在750～1 050℃间热处理制取微晶玻璃,运用同步热分析仪、X射线衍射仪、扫描电镜等测试设备对微晶玻璃的晶化行为及性能进行分析测试.研究表明:微晶玻璃主晶相为硅灰石CaSiO3和少量透辉石Ca(Mg,Al)(Si,Al)2O6,其衍射峰随处理温度升高呈增加趋势,850℃热处理时所得微晶玻璃具有较佳的微观结构和物理、机械及化学性能,其密度为2.62 g/cm3、抗弯强度达90.44 MPa,耐酸碱性分别为2.7％、0.9％,重金属浸出浓度非常低.

Crystallization Behavior of Glass-ceramics from Arc-melting Slag of Waste Incineration Fly Ash

To deal with the issue of municipal solid waste incineration fly ash,are melting treatment technology was developed in combination with electric arc furnace metallurgical processes.Glass-ceramics was made of arc-melting slag from waste incineration fly ash and additional glass cullet through crushing,pressing and sintering at temperature between 750 ℃ and 1050 ℃.The crystallization behaviours of the glass-ceramics were examined by differential thermal analysis（DTA）,X-ray diffractometry（XRD） and scanning electron microscopy（SEM）.It is shown that main crystalline phase of the glass-ceramics are wollastonite（CaSiO3） and diopside（Ca（Mg,Al）（Si,Al）2O6）,and the diffraction peaks become more intensive at higher temperature.It is found that the glass-ceramics sintered at 850 ℃ has the optimal physical,mechanical and chemical characteristics,and it has density of 2.62 g/cm3,bending strength of 54.96 MPa,chemical resistance of 2.7% and 0.9% in acid and alkali solution respectively.Furthermore,the leaching concentration of heavy metals is very low.