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A combination process of mineral carbonation with SO2 disposal for simulated flue gas by magnesia-added seawater

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The desulfurization by seawater and mineral carbonation have been paid more and more attention. In this study, the feasibility of magnesia and seawater for the integrated disposal of SO2 and CO2 in the simulated flue gas was investigated. The process was conducted by adding MgO in seawater to reinforce the absorption of SO2 and facilitate the mineralization of CO2 by calcium ions. The influences of various factors, including digestion time of magnesia, reaction temperature, and salinity were also investigated. The results show that the reaction temperature can effectively improve the carbonation reaction. After combing SO2 removal process with mineral carbonation, Ca2+ removal rate has a certain degree of decrease. The best carbonation condition is to use 1.5 times artificial seawater (the concentrations of reagents are 1.5 times of seawater) at 80°C and without digestion of magnesia. The desulfurization rate is close to 100% under any condition investigated, indicating that the seawater has a sufficient desulfurization capacity with adding magnesia. This work has demonstrated that a combination of the absorption of SO2 with the absorption and mineralization of CO2 is feasible.

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The work is supported by Science and technology project of Hebei Province (No. 17273101D), Chinese Postdoctoral Science Foundation (No. 2017M611142), National Key Research and Development Program (No. 2016YFB0600500), the National Natural Science Foundation of China (Grant No. 21306037), Program for Changjiang Scholars and Innovative Research Team in University (No. IRT14R14).

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Correspondence to Junsheng Yuan.

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Zhao, Y., Wu, M., Ji, Z. et al. A combination process of mineral carbonation with SO2 disposal for simulated flue gas by magnesia-added seawater. Front. Chem. Sci. Eng. 13, 832–844 (2019). https://doi.org/10.1007/s11705-019-1871-7

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  • mineral carbonation
  • wet SO2 disposal
  • sea-water
  • desulfurization