Coal-based solid waste backfill slurry
Whole-process carbon sequestration
Synergistic stirring and curing stages mineralize CO₂ into the backfill, achieving markedly higher sequestration than either stage alone.
Zhou, Nan · Zhang, Jixiong · Yuzhe, Zhang · Yan, Hao
International Journal of Mining Science and Technology 2026
Specifications
- two-stage sequestration amount
- {'zh': '5.12', 'en': '6.02'} %
- Stirring-stage-only sequestration amount
- {'zh': '0.66', 'en': '3.10'} %
- Curing-stage-only sequestration amount
- {'zh': '3.53', 'en': '5.09'} %
Advantages
Pressure and temperature tunable
CO₂ pressure and ambient temperature positively correlated with sequestration amount, allowing targeted enhancement by adjusting conditions.
Mechanisms clarified
Stirring stage is governed by dissolution-leaching-mineralization, while curing stage by hydration-driven permeation-dissociation-sequestration, both as solid-liquid-gas multiphase reactions.
Applications
- coal mine backfill mining：Coal-based solid waste fills goaf while sequestering CO₂, synergizing waste utilization and carbon reduction.
- underground engineering support：Backfill provides underground support while mineralizing CO₂ to enhance strength, integrating safety and sequestration.
- carbon emission reduction technologies：CO₂ is permanently trapped in backfill materials, reducing coal mine carbon emissions.