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Valorizing Steel Slag

Steel slag is no longer waste. It's a high-performance aggregate and cementitious material. SymbioFlows helps you find the best market for your slag.

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How Steel Slag Is Classified

The European Waste Catalogue codes steel slag under chapter 10 02 (wastes from the iron and steel industry). Both entries below are non-hazardous, which simplifies cross-border shipment for recovery.

10 02 01 Non-haz
Wastes from the processing of slag
10 02 02 Non-haz
Unprocessed slag

Source: EUR-Lex Commission Decision 2000/532/EC

Construction

High-quality aggregate for road bases, asphalt, and railway ballast.

Cement Production

Raw material for clinker production or as a supplementary cementitious material.

Agriculture

Soil conditioner and liming agent to correct soil acidity.

The Hidden Value of Steel Slag

Steel slag is a byproduct of the steelmaking process, but its chemical and physical properties make it a valuable resource.

Applications & Benefits

  • Road Construction: Superior durability and skid resistance compared to natural aggregates.
  • CO2 Reduction: Using slag in cement reduces the carbon footprint of concrete.
  • Cost Efficiency: A cost-effective alternative to quarried stone.

Go Deeper on Industrial Symbiosis

How steel slag fits into a wider valorisation strategy.

Benefits of Industrial SymbiosisWhy turning waste streams into off-taker matches creates measurable economic and environmental valueHow AI Matching Technology WorksHow SymbioFlows pairs waste producers with verified off-takers at scaleCircular Economy GuideA practical introduction to closing material loops between industries

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