Empirical Study of Abandoned Mine Backfill Materials based on Mineral Carbonation for Geological CO2 Sequestration

Carbon capture, utilization, and storage (CCUS) technology has recently emerged as a key strategic solution for achieving carbon neutrality by converting CO 2 into high-value industrial resources.In particular, mineral carbonation offers significant advantages, including superior storage stability and minimal risk of leakage, by transforming CO 2 into thermodynamically stable carbonate minerals.This study developed a mineral carbonation-based mine backfill material using fly ash, a byproduct of coal-fired power plants, to reclaim abandoned mines and achieve geological CO 2 sequestration.The ground reinforcement effects and constructability of the developed material were verified through laboratory and field tests.Furthermore, its field applicability was evaluated by deploying it at a test bed within an underground limestone mine.The mine backfill material developed in this study is expected to contribute significantly to achieving carbon neutrality in the future.