煤中砷的分布和赋存规律研究

Research on the distribution and occurrence of arsenic in coal

在较全面系统地收集了已发表的资料和检测了我国西南、西北和华北地区 14 7个煤样中砷含量的基础上 ,对代表性矿区煤中砷的成因机理及其与有机质的亲和性、与硫的亲和性以及与煤变质程度的关系作了分析 .我国西南地区第三纪富砷褐煤受大断裂热液影响为主 ,砷主要以有机质结合态赋存 ;华北地区石炭二叠纪煤中砷分布受沉积环境影响明显 ,当海水入侵沼泽还原环境 ,黄铁矿含量增高的同时 ,砷含量相应升高 ,砷主要以类质同象置换硫赋存于黄铁矿中 .岩浆侵入活动的高温气液是导致高变质程度煤中砷元素富集的直接原因之一 ;西北地区侏罗纪煤中砷含量水平低 。

Based on the all sided and systematic collections of the information and the test of the As content in 147coal samples from west southern, west northern and northern China, this paper analysis the reason for As forming and distributing, the affinity between As and organic matter or between As and sulfur and the relative between As and coal metamorphic grade. Tertiary high As lignite in west southern China is affected mainly by hydrothermal coming from huge faults . Arsenic in coal occurs by cohering with organic matter; Arsenic in Carborniferous Permian coal in northern China is affected mainly by depositional environment .When sea water invaded marshes which were under reducing environment,with the content of pyrite increasing the arsenic content of coal went high at the same time. Arsenic occurs in coal by isomorphic substituting for S in pyrite.The magma hypothermal is the direct reason for the accumulation of As in high metamorphic coal; As content of Jurasic coal in west northern China is the lowest and the coal is the best environment protection coal in China.