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

本研究旨在利用可回收的螯合剂和工业废物/岩石在中低温下开发一种高效、低成本的CO2矿化工艺。在第一年的研究中，证实了螯合剂对促进CO2矿化的优异作用。在弄清各种条件对矿物溶解和碳酸化影响的基础上，对该体系进行了优化(Wang et al.， J. Environ；化学。Eng。, 2022)。此外，螯合剂在控制碳酸钙纯度和形态方面的特殊作用也得到了证实(Wang et al., Sci。Rep., 2021)，这对于制造有价值的工业应用产品具有重要意义。然而，该工艺在化学成本方面仍然存在挑战，特别是对于Na2CO3。这个问题在第二年的研究中得到了解决，在此期间，该工艺得到了进一步发展，以消除二氧化碳储存过程中对化学品的消耗，并大大降低了成本。验证了该工艺处理各种工业废弃物的可行性。此外，目前正在研究使用天然螯合剂（如氨基酸）并将其应用于地下岩石储层的可能性，初步结果已经发表(Yoshioka et al., Front。环绕。科学。, 2022;Takahashi等，地球化学，2023；菊池等人，前。环绕。科学。, 2022)。最后，对回收液中杂质金属的去除进行了研究，研究结果有望在不久的将来得到应用。

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.