燃煤灰渣中微量元素分布规律的研究

研究了锅炉飞灰和底灰中１５种微量元素的含量和分布，探讨了煤炭燃烧后，微量元素在灰渣中的集散及其影响因素，飞灰和底灰中大多数元素高于全国土壤背景值，７种元素高于克拉克值，其余８种低于克拉克值，飞灰中多数元素的地球化学富集因子高于１，呈富集状态，而底灰中多数元素富集因子小于１，飞灰和底灰中微量元素含量与煤中微量元素含量呈线性关系，微量元素含量不仅与煤有关，还受锅炉燃烧方式等人为因素影响。

STUDY ON THE DISTRIBUTION LAWS OF THE TRACE ELEMENTS IN COAL ASH AND CINDER

This paper studies the content and distribution of 15 trace elements in the fly ash and bottom ash of boilers, and approaches the accumulation and scatter law and the affecting factors of the trace elements in coal cinder. In fly ash and bottom ash, most of the trace elements have higher contents than soil background values of whole country, and the contents of 7 trace elements are higher than Clarke values and other 8 lower than Clarke values. The geochemical enrichment factors of most elements are more than 1 in fly ash, being in enrichment state, but less than 1 in bottom ash. There are liner relations between the contents of trace elements in fly ash and bottom ash and the contents of trace elements in coal. The element contents are related to the kind of coal, but are also affected by some man-made factors especially the burning pattern of boiler.