锑在淮南煤中的分布特征与富集成因Distribution Features and Enrichment Causation of Antimony in Huainan Coal
齐翠翠,刘桂建,匡武
摘要(Abstract):
锑是煤中潜在的有害微量元素。前期对全国各省份煤田锑质量分数的初步统计发现,安徽煤中锑的平均质量分数为6.50μg/g,高于大部分省份,属典型高锑区。进一步统计两淮煤田492个煤样数据表明,锑在淮南煤田煤中的质量分数(6.06μg/g,n=453)比淮北煤田(0.68μg/g,n=39)高一个数量级,且淮南煤田的锑质量分数在不同成煤时代和不同矿区存在较大的差异。淮南煤中锑与硫及其他矿物组分的统计相关性不显著,推测锑可能以有机结合态的形式赋存。以锑质量分数较高的淮南东部的朱集煤矿为例,通过探讨锑在煤中的富集机制发现:成煤盆地即使陆源碎屑逐渐增强,锑在不同煤组中的质量分数也无明显增加;锑的最大均值出现在岩浆侵入变质程度较高的下石盒子组底部的4-2煤层中。因此,推断淮南煤中锑的富集可能与沉积源区的物质输入无关,主要受区域岩浆活动伴随的富锑热液的影响。
关键词(KeyWords): 锑;高锑煤;分布特征;地质富集模式
基金项目(Foundation): 安徽省自然科学基金(1408085MD69);; 中国博士后科学基金(2012M521238);; 国家自然科学基金(41402133)
作者(Author): 齐翠翠,刘桂建,匡武
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