新化矿区煤矸石中微量元素赋存形态及浸出特征
A Study on Chemical Forms and Leaching Characteristics of Trace Elements in Coal Gangue from Xinhua Coal Mine in Guizhou Province, China
查看参考文献29篇
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文摘
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利用BCR连续提取法和浸泡实验,对贵州省新化煤矿区不同风化程度的煤矸石中微量元素As、Cd、V、Zn、Co、Cr、Cu、Ni、Pb的赋存形态及浸出浓度进行研究。赋存形态研究结果表明: 在煤矸石中As和Cd元素主要以酸溶态、可还原态和可氧化态形式赋存,而其他微量元素V、Zn、Co、Cr、Cu、Ni、Pb主要以残渣态形式赋存;除了V元素的赋存形态含量百分比不受煤矸石风化程度影响外,其它微量元素的赋存形态的含量百分比均会受到煤矸石风化程度的影响。煤矸石的浸出实验表明: 浸泡时间是影响煤矸石中微量元素释放的一个重要因素;在浸泡过程中,大部分微量元素在浸泡前期的浸出浓度受煤矸石风化程度的影响,Zn和Cu元素则是在整个浸泡过程的浸出浓度均受到煤矸石风化程度的影响;不同粒径大小的煤矸石在浸泡过程中,除微量元素As和Co的浸出浓度不受煤矸石粒径大小的影响,其他微量元素在浸泡前期和中期的浸出浓度均与煤矸石的粒径大小呈反比。 |
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其他语种文摘
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Chemical forms and leaching characteristics of nine trace elements As, Cd, V, Zn, Co, Cr, Cu, Ni, and Pb in different weathering degree of coal gangue from Xinhua coal mine area in Guizhou Province, China were investigated by using BCR sequential extraction procedures and soaking experiments of contamination releasing regularity of coal gangue. Results of BCR sequential extraction procedures show that As and Cd in coal gangue were mainly in the form of the acid soluble, reducible and oxidizable occurrence, and other trace elements V, Zn, Co, Cr, Cu, Ni, and Pb were mainly in the form of residual occurrence. Except for V, the percentage of chemical forms of other trace elements was affected by the weathering degree of coal gangue. Results of soaking experiments show that soaking time was an important factor to release concentration of trace elements in coal gangue. During the soaking experiment, leaching concentration of most trace elements was influenced by the weathering degree of coal gangue at pre-soaking. Weathering degree of coal gangue can affect leaching concentration of Zn and Cu in whole soaking progress. During different particle size of coal gangue soaking, leaching concentration of trace elements decreased with increasing particle size of coal gangue at pre-soaking and mid-soaking, other than As and Co. |
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来源
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地球与环境
,2016,44(1):36-46 【核心库】
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DOI
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10.14050/j.cnki.1672-9250.2016.01.005
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关键词
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煤矸石
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微量元素
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BCR连续提取法
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浸出实验
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风化程度
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地址
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1672-9250 |
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学科
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地质学 |
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基金
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中国科学院“百人计划”项目
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文献收藏号
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CSCD:5636491
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