Steel slag CDR potential in Teesside

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Characterising steel slag usage in Teesside

• Alkaline wastes can offset CO2 emissions of mining and steelmaking industries.

• Wastes management practices can enhance CO2 uptake in alkaline wastes.

• Controlling the watering frequency enhances CO2 uptake in alkaline wastes.

• Economic evaluation may encourage investments in passive carbonation technologies.

• Key spatial datasets with iron and steel slag databases:

  • British Geological Survey (Digimap) – regions of ‘artificial made ground’ extracted within a 1.5km buffer of former iron and steel works
  • Verified OS Digimaps
  • OS Terrain 5 FTM – current topography of slag disposal areas
  • Centre for Ecology and Hydrology LCM (slag disposal area shapefiles)

• Redcar & Cleveland has an estimated 10 million m3 identified iron and steel slag deposits.
  

  • Potential in Teesside (assuming 1500 kg/m3 density average):
    • DC = 4.44-5.06 Mt CO2
    • ERW = 6.33-8.76 Mt CO2
    • PC = 0.00012-0.18 Mt CO­2
  • Direct Carbonation and/or Enhanced Weathering are key to unlock the CDR potential of slag deposits in Teesside.

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Land Use Map - Middlesbrough. Brown areas of interest - present challenging locations on south side of River Tees due to political and commercial regeneration uses. North of Tees may be more appropriate targets.