| Project/Area Number |
21K14571
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 31020:Earth resource engineering, Energy sciences-related
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| Research Institution | Tohoku University |
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Principal Investigator |
WANG JIAJIE 東北大学, 環境科学研究科, 助教 (60875467)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Project Status |
Granted (Fiscal Year 2022)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
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| Keywords | CO2 mineralziation / Chelating agent / Carbonates / industrial waste / silciate / Silicates / CO2鉱物化 / キレート剤 / 炭酸塩 / 岩石 |
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| Outline of Research at the Start |
本研究は、キレート剤の革新的利用によるCO2鉱物化プロセスを新たに考案し、岩石や産業廃棄物中の金属カチオンの抽出と炭酸化プロセスにおけるキレート剤の挙動が炭酸塩形成およびCO2鉱物化率へ及ぼす影響を明らかにすることである。このCO2鉱物化の一連のプロセスは、炭酸塩の形成に有利なアルカリ性条件下において100°C未満で実施可能であり、大量に存在する原料(岩石等)として、再利用可能なキレート剤及び地熱エネルギーを利用し、CO2鉱物化に伴う有用化合物(純度の高い炭酸塩など)を効率的に析出・製造することも可能である。
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| Outline of Annual Research Achievements |
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.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The application of this system to various industrial wastes has been verified, and an advanced process has been proposed and tested, resulting in a significant reduction in chemical costs associated with CO2 storage. This system is expected to find application in a range of industries, such as the pole industrial and power plant sectors, which produce significant amounts of biomass ash. Furthermore, our investigations suggest that there may be potential for the recovery of rare earth elements during the CO2 storage process. Finally, the application of this system to underground rock reservoirs and applying natural chelating agent is also undergoing and obtained favourable results which have been published in several international journals.
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| Strategy for Future Research Activity |
In the final year of this research, our focus will be on addressing technical challenges that may impact the efficiency of Ca extraction and carbonation from the extraction solution, such as the removal of heavy metals or other impurity elements. Additionally, we will strive to further promote the industrial application of this system by establishing pilot or large-scale reactors. Lastly, we will continue to explore the potential application of this system in other research fields, including geothermal exploration, as well as the development of earth-scale systems, such as those utilizing coastal eco-systems.
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