Experimental Study on the Characteristics of Modified Ca-Based Sorbents and its Mercury Adsorption Capability in the Flue Gas


Article Preview

In this paper, Ca-based sorbent, Ca(OH)2 and CaCO3, was modified with different concentration of KMnO4 and their mercury adsorption capability in the flue gas was experimentally conducted by using a lab-scale multi-phase flow reactor system developed by Shanghai University of Electric Power, and the result showed that the removal efficiency of flue gas mercury of Ca-based sorbent was greatly improved with modification by different concentration of KMnO4, and the removal efficiencies were 80.92%,85.38%,82.35%,83.51% and 89.84% respectively. The removal efficiencies of Ca(OH)2 modified with KMnO4 is increased significantly may be because strong oxidation of KMnO4 made Hg0 convert into oxidized mercury, Hg2 +, which is easier to be removed, as well as, the modification by KMnO4 may change the surface properties of Ca(OH)2 so that it became more active to capture mercury in the flue gas.



Advanced Materials Research (Volumes 424-425)

Edited by:

Helen Zhang and David Jin




P. Wang et al., "Experimental Study on the Characteristics of Modified Ca-Based Sorbents and its Mercury Adsorption Capability in the Flue Gas", Advanced Materials Research, Vols. 424-425, pp. 971-976, 2012

Online since:

January 2012




[1] J K Jiang, J M Hao, Y Wu, et al. Development of Mercury Emission Inventory from Coal Combustion in China [J]. Environmental Science, 2005, 26(2): 34-39.

[2] John H. Pavlish , Lucinda L. Hamre, Ye Zhuang, Mercury control technologies for coal combustion and gasification systems, Fuel 2010, 89: 838–847.

DOI: https://doi.org/10.1016/j.fuel.2009.05.021

[3] Hancai Zeng, Feng Jin, Jia Guo, Removal of elemental mercury from coal combustion flue gas by chloride-impregnated activated carbon, Fuel 2004, 83: 143–146.

DOI: https://doi.org/10.1016/s0016-2361(03)00235-7

[4] Pengfei Zhao, Xin Guo, Chuguang Zheng, The effect of the flue gas composition on the Ca-based sorbent removal elemental mercury. 2008 China Engineering Thermal Physics Institute, In Chinese.

[5] S B Ghorishi, C F Singer, C Sedman. Preparation and evaluation of modified lime and silica-lime sorbents for mercury vapor emission control. EPRI-DOE-EPA Combined Utility Air Pollution Control Symposium [C]. Atlanta: Georgia, (1999).

[6] Chang, J. C. S., Ghorishi, S. B, Simulation and evaluation of elemental mercury concentration increase in flue gas across a wet scrubber, Environmental Science & Technology, 2003, 37(24): 5763-5766.

DOI: https://doi.org/10.1021/es034352s

[7] Zhijun Huang, Yufeng Duan, Yunjun Wang, Experimental Investigation on Absorption of Hg in Simulated Fuel Gas by Modified Ca(OH)2, Proceedings of the CSEE, 2009, 29(17): 56-62, in Chinese.