| 研究実績の概要 |
To address the remaining issues for CO2 mineralization, i.e., low carbon storage efficiency and poor economic performance, this research aims to develop a new CO2 mineralization system by using recyclable chelating agents at low to moderate temperatures. The new CO2 mineralization system has the potential merits of high efficiency and high economic performance, thus is promising to be applied widely to fight climate change.
In the first year of research, the excellent role of chelating agent on promoting CO2 mineralization was confirmed. Based on clarification of the effects of various conditions on mineral dissolution and carbonation, the system was optimized. Moreover, the special role of chelating agents on controlling Ca carbonates purity and morphologies was confirmed (Wang et al., Sci. Rep., 2021), which has great significance in making valuable products for industrial application.
After that, a sustainable process for enhanced CO2 mineralization using chelating agents were proposed and optimized (Wang et al., J. Environ. Chem. Eng., 2022). The technical feasibility was verified and potential challenges were proposed. Finally, the application of this system to various industrial wastes were also started and the behaviours of heavy metals and rare earth elements will also be investigated from the environmental science and resource aspects.
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| 今後の研究の推進方策 |
The research will continue to investigate the minerals dissolution mechanism and preference in the presence of chelating agents, and to demonstrate the reason for slower dissolution rate at the later stage, thus to enhance the mineral dissolution ratio.
Also, the thermal stability of chelating agents will be tested and depend on which, the CO2 mineralization system will be optimized and evaluated from technical and economic aspects. After that, engineering systems will be designed, simulated and established. Moreover, the possibility of REEs recovery will be verified.
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