摘要
研究了山西神头电厂炉前煤（Ｃ）、炉前煤实验室高温灰化灰（ＨＡ）、飞灰（ＦＡ）和底灰（ＢＡ）中砷的分布，用用Ｘ射线衍射以及光学显微镜分析和观察了样品中矿物组成，并用逐级化学提取方法研究了砷在它们中的赋存状态．研究表明，ＦＡ中砷含量最高，ＢＡ的砷含量最低；燃煤产物中５０％以上的砷进入玻璃质硅酸盐相或莫来石矿物晶格，２０％～３０％与碳酸盐和铁锰氧化物结合，１５％～２０％的砷呈水溶态和可交换态；因为水溶态和可交换态的砷容易进入水环境中，所以。
The distribution of arsenic in coal(C), laborotary hightemprature ash(HA), fly ash(FA) and bottom ash(BA) was investigated. The phase compositions of C, HA FA and BA were analyzed using optical microscopy and xray diffraction. The modes of occurrence of arsenic in these samples were studied using sequential chemical extract method. The research shows that FA has the highest mass fraction of arsenic, while BA, the lowest. Over 50% of arsenic in coalburning residues occurs in the phase of glassy aluminosilicate or mullite, 20%￣30% of arsenic in carbonate and ironmangnese oxide phase, and 15%￣20% of arsenic in watersoluble and ionexchangeable state. The watersoluble and ionexchangeable arsenic is easy to be solved in water, so the coalburning residues are the potential source of pollution.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
1999年第4期365-367,共3页
Journal of China University of Mining & Technology
基金
国家自然科学基金
关键词
燃煤产物
砷
赋存状态
逐级化学提取
煤灰
coalburning residues, arsenic, occurrence, sequential chemical extract
