摘要
含油污泥经焚烧处理后产生的底灰(IBA)和飞灰(IFA)被归类为危险废物,因此对其安全处理引起了广泛关注。以IBA和IFA为主要原料,通过优势配伍玻璃棉(GW),制备了废物基微晶玻璃。主要研究了氯化物对微晶玻璃的析晶动力学、晶相演变、微观结构和物理化学特性的影响,以及重金属的总量、形态、浸出特性分析。结果表明氯化物的减少,既降低了基础玻璃的玻璃化转变温度(T_(g))和析晶峰值温度(T_(p)),又使其析晶活化能降低了43.82 k J/mol,促进了晶体析出。微晶玻璃中的主晶相为钙铝黄长石(Gehlenite),次晶相为莫来石(Mullite)和透辉石(Diopside)。飞灰经水洗去除氯化物后所得到的G2微晶玻璃表现出较高的物理化学特性,包括密度为3.04 g/cm^(3);吸水率为0.30%;抗压强度为507.20 MPa;显微硬度为7.57 GPa;耐碱腐蚀性为99.29%和耐酸腐蚀性为98.18%。通过制备微晶玻璃,重金属的浸出浓度远低于标准的毒性阈值。浸出率均低于0.29%,最低可达到0.01%,其中酸可提取态部分在G1和G22种微晶玻璃中分别降低至0.97%~4.21%和1.52%~4.58%。结果表明:IBA、IFA和GW的协同处理可成为一种有前途的处理方法,制备出的微晶玻璃既对环境无潜在风险,又可作为高附加值的建筑材料。为油泥焚烧资源化利用提供参考。
The bottom ash(IBA)and fly ash(IFA)from the incineration of oil sludge were categorized as hazardous waste and their safe disposal had attracted widespread concern.An entirely waste-based glass-ceramics was synthesized from IBA,IFA and glass wool(GW).The effects of chloride on the crystallization kinetics,crystalline phase evolution,microstructure and physicochemical properties of the glass-ceramics were mainly investigated,as well as the analysis of the total amount,morphology and leaching characteristics of heavy metals.The results showed that the reduction in chloride decreased parents glass transition temperature(T_(g))and the peak crystallization temperature(T_(p)),and reduced its crystallization activation energy by 43.82 kJ/mol,facilitating the precipitation of crystals.The primary crystalline phase in the glass-ceramics was gehlenite and the secondary crystalline phases were mullite and diopside.The G2 glass-ceramics obtained from WIFA after removing chloride by water washing showed high physical and chemical properties,density:3.04 g/cm^(3),water absorption:0.30%compressive strength:507.20 MPa,microhardness:7.57 GPa,alkali corrosion resistance:99.29%,acid corrosion resistance:98.18%.The leaching concentrations of heavy metals after preparation of the glass-ceramics were well below the standard toxicity threshold.The leaching rates were all below 0.29%,and the acid extractable fraction was reduced to 0.97%~4.21%and 1.52%~4.58%in both G1 and G2 glass-ceramics respectively.The results of the study showed that the synergistic treatment of IBA,IFA and GW can be a promising treatment method,preparing glass-ceramics that is both potentially risk-free to the environment and can be used as a high value-added construction material.It provides a reference for the resource utilization of oil sludge incineration.
作者
杨一博
雷鹏威
沈伯雄
张芝昆
Yang Yibo;Lei Pengwei;Shen Boxiong;Zhang Zhikun(Tianjin Key Laboratory of Clean Energy and Pollution Control,Hebei Power System Pollutant Control Technology Innovation Centre,School of Energy&Environmental Engineering,Hebei University of Technology,Tianjin 300401,China;School of Chemical Engineering and Technology,Hebei University of Technology,Tianjin 300401,China)
出处
《环境工程》
CAS
CSCD
北大核心
2023年第S02期612-617,共6页
Environmental Engineering
基金
天津市技术创新引导专项基金,焚烧飞灰水热解毒机制及高值化制备纳米微晶玻璃研究(21YDTPJC00820)
关键词
油泥焚烧灰渣
微晶玻璃
氯化物
重金属固化
物理化学特性
oil sludge incineration ash
glass-ceramics
chloride
hwavy metal curing
physico-chemical properties
