不同类型煤矸石中环境敏感性微量元素淋滤特性  

Leaching characteristics of environmentally sensitive trace elements in different types of coal gangue

作　　者：郑刘根[1] 丁帅帅 刘丛丛[1] 姜春露[1] 陈永春 

机构地区：[1]安徽大学资源与环境工程学院,矿山环境修复与湿地生态安全协同创新中心,安徽合肥230601 [2]煤矿生态环境保护国家工程实验室,安徽淮南232001

出　　处：《中南大学学报（自然科学版）》2016年第2期703-710,共8页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(41373108);十二五国家科技支撑计划项目(2012BAC10B02);煤矿生态环境保护国家工程实验室科技攻关项目(HKKY-JT-JS2012);安徽省国土资源科技项目(2013-K-07);淮北矿业(集团)有限责任公司科技攻关项目(HBKY-2014-01)~~

摘　　要：以淮南新庄孜煤矿新鲜矸石、风化矸石、沉陷复垦区充填矸石和煤泥样品为研究对象,对样品进行分批浸出实验。采用石墨炉原子吸收光谱法(GFAAS)测定Cd,Cr,Pb和Mn 4种环境敏感性微量元素在3种p H的浸泡介质、3种粒径和6个时间段的浸出浓度,对比分析其阶段浸出率、总浸出率和最大浸泡析出量,探讨各元素的淋滤析出特征,参考地下水环境质量标准对不同元素环境效应进行评价。研究结果表明:微量元素的浸出效果随着粒径、p H降低呈增强趋势,元素的浸出总量随时间的延长呈递增趋势,煤泥中各微量元素的总浸出率高于其他类型样品;在样品类型、粒径及浸泡介质等条件一定时,4种元素的浸出效果及对环境的危害性由大到小顺序为:Cd,Pb,Cr,Mn。Samples of fresh, weathering, and filling coal gangue with coal slime were collected from Xinzhuangzi coal mine in Huainan. Batch Leaching experiments were implemented with different media, particle size and leaching times. Based on the contents of environmentally sensitive trace elements（Cd, Cr, Pb, Mn） in different soak solutions measured by graphite furnace atomic absorption spectrometry（GFAAS）, the leaching concentration, phase and total leaching rate of trace elements were computed to analyze its leaching characteristics. The environmental effects of trace elements were assessed referred to the environmental quality standard of underground water. The results show that the leaching efficiency is enhances with the decline of particle size and p H of soak solutions, and leaching amount of trace elements is increases as time elapses. Total leaching rate of trace elements in coal slime is higher than that of other coal gangue. Cd possesses maximum leaching performance and is the most hazardous trace element when sample type, particle size and soak solution are identical, followed by Pb, Cr and Mn.

关 键 词：煤矸石 环境敏感性微量元素 浸泡 环境效应 

分 类 号：X752[环境科学与工程—环境工程]