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

Abstract

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.

Graphical abstract

Keywords

mineral carbonation / wet SO₂ disposal / seawater / desulfurization

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Acknowledgements

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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