About Iron and Steel Slag


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About Iron and Steel Slag

Types of iron and steel slag
Generation of iron and steel slag
Characteristics and applications of iron and steel slag
Chemical characteristics of iron and steel slag
Iron and steel slag products
Cement
Concrete aggregate
Roads
Civil engineering works and ports/harbors
Ground improvement
Fertilizers
Rock wool
Designation under the Green Purchasing Law

Characteristics and applications of iron and steel slag


Today, iron and steel slag is used in many fields where its unique characteristics can be put to effective use.
As a result of growing environmental awareness, iron and steel slag is highly regarded as a recycled material that can reduce impacts on the environment due to its resource-conservation and energy-saving effects.

Characteristics and applications of iron and steel slag

Air-cooled blast furnace slag


This slag hardens when it reacts with water, with a hydraulic property that provides increasing strength over time. Because of its large load-bearing capacity, it is used in road base course material in the same way as gravel. There is no risk of alkali-aggregate reaction, and this slag contains no clay or organic impurities. As a result, it is also used as a concrete aggregate in the same way as natural aggregate.

Granulated blast furnace slag


Just like air-cooled blast furnace slag, this slag has a hydraulic property and there is no risk of alkali-aggregate reaction. Because of the powerful latent hydraulic property that results from fine grinding, this slag is used in products such as Portland blast furnace slag cement. When blended with cement, the ground granulated blast furnace slag becomes Portland blast furnace slag cement with the same properties as ordinary (Portland) cement. The advantages of this blast furnace slag cement, such as increasing strength over long periods of time, low heating speed when reacting with water, and high chemical durability, are put to effective use in a broad range of fields including in the construction of ports and harbors and other large civil engineering works.

Steelmaking slag


Because of its hydraulic property and the large bearing capacity it can provide, steelmaking slag is used as a road base course material. With high particle density and hardness, this slag has superior wear resistance and for this reason is used as an aggregate for asphalt concrete. In addition, due to its high angle of shearing resistance, high particle density, and large weight per unit volume, it is also used as a material for civil engineering works and as a ground improvement material (i.e., material for sand compaction piles).

Primary characteristics and applications of iron and steel slag


    Characteristics Applications
Blast furnace slag Air-cooled slag Hydraulic property Road base course material
No alkali-aggregate reaction Coarse aggregate for concrete
Low Na2O and K2O Cement clinker raw material (replacement for clay)
Thermal insulation and sound absorption effects when made into a fiber Raw material for rock wool
Fertilizer component (CaO, SiO2) Calcium silicate fertilizer
Granulated slag Strong latent hydraulic property when finely ground Raw material for Portland blast furnace slag cement
Blending material for Portland cement
Concrete admixtures
Low Na2O and K2O Raw material for cement clinker (replacement for clay)
Latent hydraulic property Material for civil engineering works, ground improvement material (Backfill material, earth cover material, embankment material, road subgrade improvement material, sand compaction material, ground drainage layers, etc.)
Lightweight, large angle of internal friction, large water permeability
Does not contain chlorides. Fine aggregate for concrete
No alkali-aggregate reaction
Fertilizer component (CaO, SiO2) Calcium silicate fertilizer
Soil improvement
Steelmaking slag Converter slag, electric arc furnace slag Hard, wear-resistant Aggregate for asphalt concrete
Hydraulic property Base course material
Large angle of internal friction Material for civil engineering works, ground improvement material (Material for sand compaction piles)
FeO, CaO, SiO2 components Raw material for cement clinker
Fertilizer components (CaO, SiO2, MgO, FeO) Fertilizer and soil improvement