贵州省煤中挥发性和半挥发性微量元素分布规律的初步研究

研究了贵州省四大煤田不同层位、不同煤种中Hg,As,Se,Pb,Cd,Tl,Zn,Sb等挥发性和半挥发性微量元素的分布规律。贵州省原煤中Hg,As,Se,Pb,Cd,Sb等元素的含量高于地壳克拉克值;Tl,Zn等的含量低于地壳克拉克值;另外,除了Pb,Zn外,贵州省原煤中Hg,As,Se,Cd的含量远远高于东北和内蒙古东部地区。微量元素聚类分析结果表明,Hg,As,Sb可能主要分布于煤的黄铁矿中;Zn和Se可能主要赋存于闪锌矿中;Cd可能部分存在于硫化物中,部分存在于硅酸盐矿物相中;Pb可能主要存在于硅酸盐矿物相中;而Tl在煤中的赋存形式较复杂。

A PRELIMINARY STUDY ON THE DISTRIBUTION LAWS OF SOME VOLATILE TRACE ELEMENTS IN COAL OF GUIZHOU PROVINCE

The distribution laws was studied of some volatile harmful trace elements as Hg, As, Se, Pb, Cd, Tl, Zn, Sb in the coal of the different coal types and coal layers from four large coal basins in Guizhou province. It is found that the contents of Hg, As, Se, Pb, Cd, Sb in coal are higher than their Clarke values, and that the contents of Tl and Zn are lower than their Clarke values. Meanwhile,except Pb and Zn,the contents of Hg, As, Se, Cd in coal of Guizhou province are much higher than those of Northeast China and Eastern Inner Mongolia's. The result of cluster analysis of trace elements in coal show that (1) As, Sb and Hg may be existed in pyrite in coal, (2) Zn and Se are mainly occurred in sphalerite, (3) part of Cd may be occurred in sulfide and the rest may be existed in silicate, (4) most Pb may be existed in silicate, (5) the modes of occurrence of Tl in coal are very complex.