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Chin. J. Process Eng. ›› 2020, Vol. 20 ›› Issue (4): 418-423.DOI: 10.12034/j.issn.1009-606X.219237

• Process & Technology • Previous Articles     Next Articles

Occurrence state of mercury in lignite fly ash

Kun REN1,2, Shuhua MA2*, Fuli LIU2,3, Jun LI1, Xiaohui WANG2   

  1. 1. School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China 2. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China 3. College of Mining, Liaoning Technical University, Fuxin, Liaoning 123000, China
  • Received:2019-06-20 Revised:2019-08-12 Online:2020-04-22 Published:2020-04-20
  • Supported by:
    Inner Mongolia Autonomous Region Science and Technology Major Project

褐煤粉煤灰中汞的赋存状态

任 坤1,2， 马淑花2*， 刘福立2,3， 李 军1， 王晓辉2   

  1. 1. 中国矿业大学(北京)化学与环境工程学院，北京 100083 2. 中国科学院过程工程研究所湿法冶金清洁生产技术国家工程实验室，北京 100190 3. 辽宁工程技术大学矿业学院，辽宁 阜新 123000
  • 通讯作者: 马淑花 shma@ipe.ac.cn
  • 基金资助:
    内蒙古自治区科技重大专项

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Abstract: Mercury is one of harmful components in the fly ash. This work took lignite fly ash from a power plant in Inner Mongolia as the research object. The occurrence state of mercury in fly ash was studied by means of X-ray fluorescence spectrometer (XRF), X-ray diffractometer (XRD) and inductively coupled plasma mass spectrometer (ICP-MS), combined with thermodynamic calculation, heat treatment and continuous leaching. The thermodynamic calculation results for possible reactions of mercury with other substances in the flue of coal-fired power plants indicated that the possible forms of mercury in fly ash included HgCl2, HgO, HgS and HgSO4. The heat treatment results showed that the mercury content in fly ash gradually decreased with the increase of temperature. When the temperature reached 500℃, mercury had been volatilized more than 90%. In order to further determine the form of mercury in fly ash, according to the nature of each mercury compound, the continuous leaching method was used to quantitatively analyze the mercury compounds in fly ash. The results showed that the forms of mercury in fly ash was mainly HgCl2 and HgS, which accounted for about 35% and 42% of the total mercury, respectively. Studying the specific occurrence state of mercury in fly ash was extremely important for the subsequent removal of mercury from fly ash and improving its comprehensive utilization.

Key words: fly ash, mercury, occurrence state, continuous leaching

摘要： 用X射线荧光光谱仪(XRF)、X射线衍射仪(XRD)及电感耦合等离子体质谱仪(ICP-MS)，结合热力学计算、热处理及连续浸出法定性和定量地研究了内蒙古某电厂褐煤粉煤灰中汞的赋存状态。结果表明，粉煤灰中汞可能的赋存状态有HgCl2, HgO, HgS和HgSO4。随温度升高，粉煤灰中汞含量逐渐降低，温度为500℃时，汞已挥发90%以上。粉煤灰中的汞以HgCl2和HgS为主，分别约占汞总量的35%和42%。

关键词: 粉煤灰, 汞, 赋存状态, 连续浸出