标题：A STUDY INTO SOLIDIFICATION OF MUNICIPAL SOLID WASTE INCINERATOR FLY ASH IN LOW-CLINKER SLAG CEMENTITIOUS MATERIALS作者：Yu, Huatang; Liu, Wenshi; Beadham, Ian; Deng, Yun;Hou, Haobo

来源出版物：FRESENIUS ENVIRONMENTAL BULLETIN 卷：22 期：10(A) 页：2963-2969 出版年：2013

摘要：Both the chemical composition and leachability of heavy metals in fly ash from a municipal solid waste incinerator (MSWI) were monitored over a period of 28 days. The leachability of heavy metals from fly ash did not exceed the toxicity characteristic leaching procedure (TCLP) regulatory limit (5 mg/l) except in the cases of Pb (25.12 mg/l) and Cr (45.66 mg/l). X-ray diffraction demonstrated that solidified products in the fly ash included C-S-H gel, ettringite class minerals, and Friedel's salt. Incorporation of 20% fly ash into portland cement reduced the strength of the cement by 28.4% after 7 days and by 31.2% after 28 days, compared with a control sample without fly ash. Scanning electron microscopy indicated that higher levels of hexagonal platy calcium hydroxide crystals were present in a cement sample with 80% MSWI fly ash than in a corresponding sample with 20% fly ash. Ettringite class minerals were also present at higher levels in the 80% fly ash sample and had a finer, needle-like structure. A sequential extraction test further suggested that Cr and Pb may pass from unstable to stable states in the solidification / stabilization process.

入藏号：WOS:000327108100001

文献类型：Article

语种：English

作者关键词：Slag cementitious materials with low clinker, MSWI fly ash, Solidification/Stabilization, Heavy metals

扩展关键词：STABILIZATION; STABILIZATION/SOLIDIFICATION; ETTRINGITE; REMOVAL; MORTARS; SYSTEMS; METALS; SLUDGE; WATER; COAL

通讯作者地址：Hou, Haobo;Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China.

电子邮件地址：houhb@whu.edu.cn

地址：

[Yu, Huatang; Liu, Wenshi; Hou, Haobo] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Peoples R China.

[Beadham, Ian] Manchester Metropolitan Univ, Manchester M15 6BH, Lancs, England.

[Deng, Yun] Nanjing Univ, Nanjing 210093, Jiangsu, Peoples R China.

研究方向：Environmental Sciences & Ecology

ISSN：1018-4619