淮北煤田煤中汞的赋存状态

郑刘根; 刘桂建; 齐翠翠; 张莹; 陈怡伟

淮北煤田煤中汞的赋存状态

郑刘根^{1, 2,},
刘桂建¹,
齐翠翠¹,
张莹¹,
陈怡伟¹

1.
中国科学院壳幔物质与环境重点实验室, 中国科学技术大学地球与空间科学学院, 安徽合肥 230026
2.
Croucher Institute for Environmental Science, and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China

基金项目:

安徽省优秀青年基金项目 04045064

国家重点基础研究发展计划资助 2006CB202202

中国科学技术大学研究生创新基金项目 KD2005032

详细信息

作者简介:
郑刘根(1972 -), 男, 博士研究生, 主要从事环境地球化学、环境科学方向研究.通讯作者: 刘桂建, E-mail: lgj@ustc.edu.cn

中图分类号: P618.130.2
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出版历程
- 刊出日期: 2007-03-25

Study on Modes of Occurrence of Mercury in Coals from the Huaibei Coalfield

1.
CAS Key Laboratory of Crust-Mantle Material and Environments, School of Earth and Space Sciences, University of Science and Technology of China, He fei 230026, China
2.
Croucher Institute for Environmental Science, and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, China

摘要

摘要: 系统采集淮北煤田10、7、5、4和3煤层的29个煤样品, 采用逐级化学提取方法研究了煤中汞的赋存状态, 根据提取步骤和汞的特性, 将煤中的汞分为水溶态、离子交换态、有机态、碳酸盐结合态、硅酸盐结合态和硫化物结合态, 利用Flow Injection Mercury System(FIMS)分析了样品中总汞和不同形态中汞的含量.测试结果表明, 与华北石炭-二叠纪煤、中国煤以及美国煤含量相比较, 淮北煤田煤中汞的含量明显富集.逐级化学提取实验结果和煤中汞与硫、灰分的相关分析结果表明, 岩浆的侵入对煤中汞的赋存状态有较大的影响, 不受岩浆侵入影响的10、4和3煤层煤中的汞主要以有机态和硫化物结合态存在, 受岩浆侵入影响的5和7煤层中的汞主要以硅酸盐结合态存在.
- 汞 /
- 赋存状态 /
- 逐级化学提取 /
- 淮北煤田
Abstract: Sequential extraction tests using Flow Injection Mercury System(FIMS)were done on 29 coal samples collected from the number 3, 4, 5, 7, and 10 coal seams in the Huaibei coalfield. The average total Hg concentrations for the coal seams 3, 4, 5, 7, and 10 were 0.13, 0.18, 0.54, 0.34, and 0.19 mg/kg respectively. The average value of Hg for all of the coal samples was 0.26 mg/kg, which is higher than that of most Chinese and U.S. coals. Six modes of Hg occurrence were recognized, including water-leachable, ion-exchangeable, organic-bound, carbonate-bound, silicate-bound, and sulfidebound Hg ones.With rare exception, little Hg was found in water-soluble, ion-exchangeable or carbonate-bound forms. Sulfide-bound Hg and organic-bound Hg dominated seams 3, 4, and 10, whereas silicate-bound Hg dominated seams 5 and 7. The relatively high Hg values observed in seams 5 and 7, especially in parting samples, are attributed to Hg enrichment by magmatic intrusions.
- mercury /
- modes of occurrence /
- sequential extraction /
- Huaibei coalfield

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图 1 煤中的汞和灰分含量之间的相关性

Fig. 1. Relationship between mercury and ash yield

下载: 全尺寸图片幻灯片

图 2 煤中汞和硫的相关性

a.未受岩浆侵入影响的煤层; b.受岩浆侵入影响的煤层

Fig. 2. Relationship between mercury and sulfur in all coal samples from the Huaibei coalfield

下载: 全尺寸图片幻灯片

图 3 不同煤层煤中汞的赋存状态所占百分比

Fig. 3. Percent concentration of mercury extracted in different steps of different coal seams

下载: 全尺寸图片幻灯片

表 1 淮北煤田煤中硫和灰分含量

Table 1. Sulfur and ash contents in coals from the Huaibei coalfield

表 2 表 2煤中汞的赋存状态及其逐级化学提取方法

Table 2. Modes of occurrence of mercury and sequential extraction tests

表 3 淮北煤田煤中汞的逐级化学提取实验结果(ng/g)

Table 3. Experimental results(ng/g)of sequential extractions on samples from the Huaibei coalfield

表 4 淮北煤田与华北C-P、中国和美国煤中汞的含量对比(ng/g)

Table 4. Concentrations of total mercury from the Huaibei coalfield as compared with C-P coals of northern China, Chinese coals, and average U.S. coals

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