摘要
采集了燃煤电厂的异相凝并后飞灰,分析了其物理化学特性。并通过淋滤实验研究了飞灰中重金属As、Se、Pb的环境稳定性。结果表明,凝并飞灰的粒径峰值为138.04μm,而粉煤灰为60.26μm;凝并后细颗粒凝聚成了较大的颗粒;凝并飞灰中重金属As、Se、Pb含量均高于同工况下粉煤灰中的含量,且后序脱硫环节所产生石膏中重金属的含量有所下降;批淋滤实验研究结果表明,凝并飞灰中的重金属浸出能力受淋滤液的pH值影响较大,温和环境和碱性条件抑制了As的浸出,酸性和碱性条件抑制了Se的浸出,而碱性条件抑制了Pb的浸出。柱淋滤实验研究结果表明,在酸性溶液和水溶液中,凝并飞灰的重金属浸出能力均受到了抑制。
This paper studied physicochemical and leaching characteristics of three hazardous trace elements As,Se and Pb in hetero-aggregation fly ash(HAFA)and coal fly ash(FA)samples which were collected from coal-fired power plant.The results show that the peak of particle size of HAFA is 138.04 and is 60.26μm of FA;the fine particles agglomerate into large particles after agglomeration;the contents of heavy metals of As,Se and Pb in HAFA are all higher than those of in FA.The content of heavy metals in gypsum produced in the subsequent desulfurization process is decreased.The batch leaching experiments show that leaching concentrations of three metals in HAFA are suppressed by mild and alkaline condition for As,by acidic and alkaline condition for Se,and by alkaline condition for Pb.The column leaching experiments show that the leaching abilities of the trace elements in HAFA are inhibited in both acidic and aqueous solution.
作者
李扬
何永来
靳立军
刘静超
胡浩权
LI Yang;HE Yong-lai;JIN Li-jun;LIU Jing-chao;HU Hao-quan(State Key Laboratory of Fine Chemicals,Institute of Coal Chemical Engineering,School of Chemical Engineering,Dalian University of Technology,Dalian116024,China;State Key Laboratory of Coal Combustion,School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan430074,China)
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2020年第11期1394-1401,I0007,共9页
Journal of Fuel Chemistry and Technology
基金
国家重点研发计划(2018YFB0605104)
国家自然科学基金(21776039)
中央高校基本科研业务费(DUT2018TB0)资助。
关键词
飞灰
异相凝并
颗粒物
重金属
淋滤
fly ash
hetero-aggregation
particles
trace elements
leaching
