Industrial & Engineering Chemistry Research
Industrial & Engineering Chemistry Research
5 years ago

H2S-Modified Natural Ilmenite: A Recyclable Magnetic Sorbent for Recovering Gaseous Elemental Mercury from Flue Gas

H2S-Modified Natural Ilmenite: A Recyclable Magnetic Sorbent for Recovering Gaseous Elemental Mercury from Flue Gas
Shijian Yang, Sijie Zou, Yong Liao, Yang Geng, Hongping He, Nan Huang, Xiaoliang Liang, Shangchao Xiong, Wei Tan
H2S-modified natural ilmenite (i.e., ilmenite-C-S) was developed as a recyclable magnetic sorbent to recover Hg0 in the flue gas as a cobenefit of the wet electrostatic precipitators (WESPs). Ilmenite-C-S showed an excellent Hg0 capture performance at 40–100 °C, and the chemical adsorption of Hg0 on ilmenite-C-S was hardly inhibited by H2O and SO2. The chemical adsorption of Hg0 on ilmenite-C-S mainly followed the Mars–Maessen mechanism (i.e., gaseous Hg0 was first adsorbed, and it was then oxidized to HgS by S22– on ilmenite-C-S). As the formed Hg species was HgS, the leaching of Hg species during the wet dust collection of the WESP was negligible. Ilmenite-C-S after the five cycles of Hg0 capture, Hg0 recovery, and sorbent regeneration still had an excellent superparamagnetism with a saturation magnetization of 14.1 emu g–1 and a superior performance for Hg0 capture with Hg0 removal efficiency of approximately 100%. Meanwhile, the ultralow concentration of Hg0 in the flue gas was recovered as a high concentration of gaseous Hg0 (>10 mg m–3), which can be condensed to liquid Hg0. Therefore, Hg0 recovery by ilmenite-C-S as a cobenefit of the WESP was a cost-effective technology for the centralized control of Hg0 emission from coal-fired plants.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b02447

DOI: 10.1021/acs.iecr.7b02447

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