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Electric arc furnace carbon steel slag (EAF)

What Is EAF Slag?

Electric arc furnace carbon steel slag is a by-product of the manufacture of steel by the electric arc furnace process (EAF).

Production and Processing

An EAF produces steel by the melting of recycled steel scrap, using heat generated by an arc, created by a large electric current. The slag is formed through the addition of lime, which is added to remove non-essential elements from the steel. The slag has a lower density than steel and therefore floats on top of the molten steel. Once the steel has been tapped into a ladle, the slag is either poured from the furnace onto the floor where it is cooled and removed for further processing, or into slag pots where specially designed vehicles are used to transport the slag to purpose built lagoons. Here it is tipped and cooled prior to onward processing.

Due to the presence of free lime (calcium oxide) and depending on the final end use of the EAF slag, the stockpiles may be weathered for a designated time period in controlled areas. Weathered slag is tested to check the expansion properties of the material as identified in BS EN 1744-1 to meet the requirements of its end use.

Typical Chemical Properties

Compound

Typical Value

Fe2O3

30

CaO

31

SiO2

16

MgO

4

Al2O3

5

Typical Physical Properties

Property

Typical Value

Relative Density (SSD)

3.4

Water Absorption

1.0

Magnesium Sulfate Soundness

1

Los Angeles

17

Aggregate Abrasion Value

2.7

Polished Stone Value

63

Applications

  • Granular and General Fills
  • Capping
  • Pipe bedding
  • Aggregates for Asphalt
  • Aggregates for surfacing dressing
  • Hydraulic Bound Mixes
  • Filter media

Standards and Specifications Applicable to the Use of Metalliferous Slag Aggregates

For further information concerning the standards and specifications applicable to Slag Aggregates refer to: http://www.mineralproducts.org/prod_agg01.htm

For case studies applicable to the use of slag aggregates refer to: http://www.mineralproducts.org/prod_agg01.htm

For more information contact Martin Bridges

Please note this website is maintained to provide information and guidance on UK issues, products and applications of those products.

 
 

For more information on aggregates, please contact (info@mineralproducts.org) or phone us on 020 7963 8000

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