Hydration–carbonation interactions in CO2-cured cemented phosphogypsum backfill for underground carbon storage

Key Points

• Hydration-carbonation interactions significantly enhance the effectiveness of cemented phosphogypsum backfill in terms of carbon storage.
• The study observes that CO2 curing distinctly improves the structural integrity of the backfill, promoting better storage capabilities for underground applications.
• Analysis of chemical and physical properties demonstrates that hydration plays a crucial role in the long-term stability of the backfill material.
• Understanding these interactions may enable more efficient approaches to underground carbon storage, mitigating environmental impact.