キレート剤による岩石/廃棄物からの金属抽出とCO2利用・鉱物化プロセスの開発

点击翻译按钮获取中文摘要

This research aims to develop a high-efficiency and low-cost CO2 mineralization process using recyclable chelating agents and industrial wastes/rocks at low to moderate temperatures.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 (Wang et al., J. Environ. Chem. Eng., 2022). 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.However, the process still poses a challenge in terms of chemical costs, particularly for Na2CO3. This issue was addressed in the second year of research, during which the process was further developed to eliminate the need for chemical consumption during CO2 storage and significantly reduce costs. The feasibility of applying this process to various industrial wastes was also verified. Additionally, the possibility of using natural chelating agents such as amino acids and applying the process in underground rock reservoirs is currently under investigation, with preliminary results already published (Yoshioka et al., Front. Environ. Sci., 2022; Takahashi et al., Geochemics, 2023; Kikuchi et al., Front. Environ. Sci., 2022).Finally, the removal of impurity metals from the recyling solution is being studied, and the results are expected to be applied in the near future.