Occurrence Mode and Thermal Stability of Mercury in Middlings

GAO Libing; REN Bingru; GUO Shaoqing; LI Hongyan

doi:10.19805/j.cnki.jcspe.2025.240061

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Occurrence Mode and Thermal Stability of Mercury in Middlings

更新时间：2025-10-16

- Occurrence Mode and Thermal Stability of Mercury in Middlings
- Chinese Journal of Power Engineering Vol. 45, Issue 5, Pages: 771-776(2025)
- 作者机构：
  
  太原科技大学环境与资源学院,山西,太原,030024
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.240061
  CLC： TQ533.1
- Published Online：19 May 2025，
  
  Published：2025
- 稿件说明：
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高丽兵,任冰茹,郭少青,李宏艳. 洗中煤中汞的赋存形态及其热稳定性动力工程学报, 2025, 45(5): 771-776 https://doi.

org/10.19805/j.cnki.jcspe.2025.240061
高丽兵,任冰茹,郭少青,李宏艳. 洗中煤中汞的赋存形态及其热稳定性动力工程学报, 2025, 45(5): 771-776 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.240061.

org/10.19805/j.cnki.jcspe.2025.240061 DOI：

摘要

采用逐级化学浸提法研究了不同产地洗中煤中汞的赋存形态

并结合程序升温热解-元素汞检测技术(TPD-AFS)研究了各种赋存形态的热稳定性。结果表明:在洗中煤中汞主要以可交换态、碳酸盐及氧化物表面结合态、有机物结合态、硫化物结合态、硅酸盐结合态以及残渣态的形式存在;洗中煤中汞的主要赋存形态为硫化物结合态汞

其含量占总汞的60.67%~62.93%

存在2个释放峰

主要在150~400 ℃释放

在400~600 ℃释放较少;洗中煤中残渣态汞含量占比为14.63%~25.31%

主要在150~300 ℃温度范围内释放;洗中煤中有机结合态汞含量占比为3.98%~7.99%

其主要在400~600 ℃温度范围内释放;洗中煤中硅酸盐结合态汞含量占比为2.18%~3.34%

其在600 ℃之后释放;洗中煤中可交换态汞含量占比为1.01%~3.20%

在热解过程中没有明显释放;洗中煤中碳酸盐及氧化物表面结合态汞含量最少

占比为0.46%~1.33%

主要在180~340 ℃温度范围内释放。

Abstract

The occurrence modes of mercury in middlings from different origins were studied by using sequential chemical extraction

and the thermal stability of various occurrence forms was investigated by combining temperature programmed decomposition-atomic fluorescence spectrometry (TPD-AFS) technique. Results show that mercury in middlings mainly exists in the forms of exchangeable Hg

carbonate and oxide surface bound Hg

organic bound Hg

sulfide bound Hg

silicate bound Hg and residual Hg. In middlings

the dominant form of mercury is the sulfide bound Hg

accounting for 60.67%-62.93% of the total mercury content

there are two release peaks

mainly released at 150-400 ℃

and less at 400-600 ℃. The content of residual Hg accounts for 14.63% to 25.31%

mainly released within the temperature range of 150-300 ℃. The content of organic bound Hg accounts for 3.98% to 7.99%

mainly released within the temperature range of 400-600 ℃. The content of silicate bound state Hg ranges from 2.18% to 3.34%

and it is released after 600 ℃. The content in the exchangeable state Hg ranges from 1.01% to 3.20%

and it shows no obvious release during pyrolysis. The content in the surface bound state Hg of carbonate and oxide is the least

ranging from 0.46% to 1.33%

and it is mainly released within the temperature range of 180-340 ℃.

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references

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