1. CO₂ Sequestration Using Carbonate Minerals

  • Natural Carbonation: Carbonate minerals like calcite (CaCO₃) and magnesite (MgCO₃) naturally react with CO₂ to form stable carbonates, permanently storing carbon.
  • Mineral Carbonation Process:
    • Reaction: CO₂ + Ca/Mg-rich minerals → Stable carbonates (CaCO₃ / MgCO₃).
    • Occurs in ultramafic rock deposits containing olivine, serpentine, and brucite.
  • Enhanced Carbon Sequestration:
    • Industrial applications: Using mine tailings from nickel, platinum, and asbestos mines to capture CO₂.
    • Accelerated weathering: Injecting CO₂ into carbonate-rich mine waste to speed up sequestration.

2. Carbonate Minerals in Sustainable Mining

  • Neutralizing Acid Mine Drainage (AMD):
    • Limestone (CaCO₃) is used to neutralize acidic waters from sulfide mining, reducing environmental damage.
  • Reducing Carbon Footprint:
    • Carbonate-rich tailings can be repurposed for CO₂ capture, making mining operations more sustainable.
  • Eco-Friendly Construction Materials:
    • Carbon-negative concrete made using CO₂-reacted minerals, reducing emissions from cement production.

3. Practical Applications in Green Mining

  • Mine Waste Utilization:
    • Using mine tailings for CO₂ sequestration instead of disposal.
  • Carbon-Neutral Mining:
    • Integrating carbonation technologies in mining to offset CO₂ emissions.
  • Land Reclamation:
    • Restoring mined land using carbonate-rich materials to improve soil health and prevent erosion.