| 研究実績の概要 |
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 past two years of research, we confirmed the ability of chelating agents to dissolve industrial wastes and verified the effectiveness of the CO2 mineralization process through laboratory experiments. However, the previous process also had the problem of consuming chemicals during operation. This year, we improved the process by using an recyclable GLDA+NaHCO3 solution for Ca extraction and carbonization, reducing chemical costs (Wang et al., J. Environ. Chem. Eng., 2024). Using bottom ash collected from plastic incineration as a representative solid waste, we validated the effectiveness of this improved process and emphasized the significance of temperature control during operation. The improved process is about to enter the pilot application phase and has significant potential as a green technology crucial for the global pursuit of CO2 mitigation.
In addition, we found that the use of chelating agents results in the enhancement and congruent dissolution of a wide range of silicate minerals, which broadens the range of raw materials that can be utilized for CO2 storage or geothermal exploration (Wang et al., Am Min, 2024; Salala, et al., Geothermics, 2024). The use of amino acids also produces such a promoting effect, which is expected to enhance mineral weathering for atmospheric CO2 reduction in natural environments in the long term (Kikuchi et al., WRI-17, 2023).
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