【企画講演】最近の石炭等エネルギーの開発・利用の動向 ［9/12(木) AM 第1会場］

[3101-07-03] フライアッシュと海水を用いたCO₂の鉱物化における炭酸化効率について

○テオドラノエリ タンバリア¹、菅井 裕一¹、江﨑 丈裕¹ (1. 九州大学)

司会：菅井 裕一（九州大学）

キーワード：CO2鉱物化、石炭灰、海水、炭酸化効率、pH

Direct carbon dioxide (CO₂) mineralization utilizing fly ash represents a promising technology for achieving CO₂ sequestration. Given its abundance and calcium-rich composition, we are currently exploring seawater's potential as a viable alternative for CO₂ sequestration. Despite limited prior research and an unclear mineralization mechanism, we are employing fly ash with seawater to conduct direct CO₂ mineralization under ambient conditions to assess carbonation efficiency. Our findings have uncovered a critical pH range (8-10) that enhances calcium elution efficiency, amplifying carbonation efficiency. Within this pH range, magnesium hydroxide (Mg(OH)₂) significantly influences calcium carbonate (CaCO₃) precipitation kinetics and crystalline phase. This innovative approach holds promise for carbon sequestration and has the potential to substantially contribute to sustainable CO₂ utilization strategies, addressing the urgent need in our current environmental context.