Development of CO2 utilization and mineralization process through the enhanced extraction of metals from rocks/solid wastes by chelating agents

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K14571
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 31020:Earth resource engineering, Energy sciences-related
• Research Institution: Tohoku University
• Principal Investigator: Wang Jiajie 東北大学, 環境科学研究科, 助教 (60875467)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: CO2削減 / 加速溶解 / キレート剤 / 炭酸塩鉱物

Outline of Final Research Achievements

Industrial waste utilization for CO2 mineralization offers a highly promising approach to significantly reduce CO2 emissions; however, it faces the challenge of consumption of huge amounts of chemicals without their recovery. This study has developed an efficient process for CO2 capture and mineralization using a recyclable solution comprising an environmentally friendly chelating agent GLDA enriched with NaHCO3. This process can be conducted at temperatures below 100 ℃ and at ambient pressure. The extraction of Ca and the production of high-purity CaCO3 are notably improved by employing the chelating agent solution, which boasts high recyclability and incurs no chemical consumption during operation. Additionally, the research has revealed that the use of chelating agents enhances the congruent dissolution of various silicate minerals, thereby expanding the range of materials suitable for CO2 reduction.

Free Research Field

地球資源工学

Academic Significance and Societal Importance of the Research Achievements

本CO2鉱物化プロセスは、従来の技術とは全く異なり、大量の化学薬剤と高温などのエネルギーの利用という従来の課題を解決し、様々な廃棄物を利用して、抽出液を効率的にリサイクルすることで、低コスト・高収益・環境に優しい特徴を持ち、CO2鉱物化のフロンティア技術となり、CO2排出量の大幅削減に貢献できると期待できる。