2021 Fiscal Year Research-status Report
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
| Project/Area Number |
21K14571
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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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| Keywords | CO2 mineralziation / Chelating agent / Carbonates / Silicates |
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| Outline of Annual Research Achievements |
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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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
The technical feasibility of the enhanced CO2 mineralization process using chelating agents has been verified and potential challenges were considered.
The application of this system to various industrial wastes were also started and the behaviors of heavy metals and rare earth elements will also be investigated from the environmental science and resource aspects. The preliminary result of REEs tracking shows the possibility of resources recovery during CO2 storage.
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| Strategy for Future Research Activity |
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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| Causes of Carryover |
前年度では新型コロナの影響で旅費とその他の関連費用の出費は減少した。
本年度では連続式反応容器とパイロットスケール反応システムの構築、連続運転・実証実験等、比較的多く実施する予定があり、ICPやHPLCなどの部品補充も必要であるため、設備備品費、消耗品費は増加する。尚、本年度では国際学会への積極的な参加も予定しているため、学術論文の校閲料および学会参加費等も増加する。
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