摘要
垃圾焚烧飞灰是公认的危险废弃物,必须对其进行有效处理。鉴于冶金烧结过程具有相似的高温熔融环境,提出采用冶金烧结法处理垃圾焚烧飞灰。对垃圾焚烧飞灰进行造球成型与铁浴熔融分离固化实验,结果显示:添加8%水泥和1%稳固剂的飞灰造球成型性好,在养护实验8～11d,飞灰球团抗压强度在600～700N/球,达到贮存、运输要求;铁浴熔融能有效地分离固化飞灰中重金属元素,90%以上的Mn、Fe和70%以上Cr、Cu进入铁相,熔渣浸出毒性均能达标。研究结果为冶金烧结法处理垃圾焚烧飞灰的工业应用提供了可行性验证。
MSW incineration fly ash should be treated safely because it is one of acknowledged hazard solid wastes.Metallurgical sinter has a similar high temperature environment as melting treatment,therefore,it is proposed as hazard-free treatment for MSWI fly ash.Experiments are carried out to investigate the pelleting properties of fly ash and the seperation and solidification of heavy matals in MSWI fly ash iron-bath melting process.The results show that adding 8% cement and 1% agent for solidification,the compressive strength of fly ash pellets is 600～700N/bellet when its curing period is about 8～11d,achieving the demands for transporting and sintering.By iron-bath melting,more than 90% Mn and Fe in MSWI fly ash are removed and solidified in iron phase,and the distribution ratio of Cr and Cu in iron phase is beyond 70%.The leaching toxicity of molten slag are tested,and the leaching toxicity of all the metals can reach the standard.All the results indicate that the hazard-free treatment for MSWI fly ash by metallurgical sintering is feasible.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第11期84-88,共5页
Journal of Chongqing University
基金
国家自然科学基金资助项目(50774107)
重庆市科技攻关计划资助项目(垃圾焚烧飞灰冶金烧结资源化利用技术)
重庆市自然科学基金资助项目(CSTC
2010BB0234)
关键词
飞灰
烧结
熔融
垃圾处理
焚烧
fly ash
sintering
melting
refuse disposal
incineration
