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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 the Engine WorksHow SymbioFlows characterises a residue and checks each route against published standardsCircular Economy GuideA practical introduction to closing material loops between industries

Simulate your 10 02 stream

Steel slag

With a lab analysis, the engine checks the stream against each receiving route's published limits and returns what is supported, what is refused, and why. Without one yet, we tell you which routes it can evaluate and what analysis that needs.

What do you need?

An engineer replies within 1 business day. That reply confirms what is needed to run the dossier and when it can follow. A route the engine does not cover yet is reported as not yet evaluable, with the evidence that would change that.

See what the output looks like: a worked dossier.