Slag

Outstanding selective crushing effects

With our vertical-shaft crushing machines, metals from slag and slag-like materials can be recovered as secondary raw materials. At the same time, their mineral components are treated in such a way that it remains possible to market them (e.g. as building materials). The following types of slag are generally suitable for treatment with BHS technology:

  • Steel mill slag
  • Recycled aluminum slag
  • Aluminum saltcake
  • Stainless steel slag
  • Electric arc furnace slag
  • Dross (metal content > 45%)

When treating slag from steel mills, the main objective is to recover materials that can be used for construction. Recovering metals is the primary goal in treating slag from smelting plants, dross and aluminum saltcake.

Although these different types of slag have very different properties, all of these materials can be treated in the same BHS crushing machines. The selective crushing capabilities of these machines take advantage of the huge difference in elastic modulus of the minerals and metals in the slag. The appropriate BHS machine, rotor impact mill (type RPMV), rotor centrifugal crusher (type RSMX) or Rotorshredder (type RS), depends primarily on the grain size of the input material. We recommend tests with your input material at Sonthofen.

Video on "Crushing of aluminum saltcake and exposure of metals"

Processing of aluminum saltcake in the rotor impact mill (RPMV)

Aluminum saltcake (0-50 mm) before treatment...
Aluminum saltcake (0-50 mm) before treatment...
... and after treatment in the rotor impact mill (RPMV)
... and after treatment in the rotor impact mill (RPMV)

Processing of steel mill slag in the Rotorshredder (RS)

Steel mill slag before treatment...
Steel mill slag before treatment...
... and after treatment in the Rotorshredder (RS)
... and after treatment in the Rotorshredder (RS)
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Downloads

Brochure "Rotor centrifugal crusher (RSMX)" (PDF / 3.3 MB)
Brochure "Rotor centrifugal crusher (RSMX)"

Product brochure for rotor centrifugal crusher (RSMX)

Size: 3.3 MB
Brochure "Rotorshredder (RS)" (PDF / 1.6 MB)
Brochure "Rotorshredder (RS)"

Product brochure for Rotorshredder (RS)

Size: 1.6 MB
“Rotary impact mill for recycling (RPMV & RPMX)” brochure (PDF / 2.6 MB)
“Rotary impact mill for recycling (RPMV & RPMX)” brochure

Product brochure for rotary impact mill (RPMV & RPMX) for recycling applications

Size: 2.6 MB

Advantages of BHS recycling technology

  • Optimum recovery of ferrous and non-ferrous metals
  • Dry mechanical treatment
  • Easy maintenance
  • Well-proven technology
  • Trained service team

BHS recycling technical center

Link to tests at BHS technical center

Technical article

Recycling of resources in steel production

recovery
2 / 2014
April 2014
PDF (1.9 MB)
Recycling of resources in steel production

The slag formed during stainless steel production contains valuable raw materials which should preferably be fed back to the melt or intelligently reused. With a treatment plant at Outokumpu Nirosta in Krefeld/Germany ThyssenKrupp MillServices & Systems GmbH (TKMSS) has demonstrated that dry treatment of slag is significantly more economical and environmentally friendly than wet treatment. The central element of the plant technology is impact crushing.

Size: 1.9 MB

Impact Stresses for Selective Comminution - For processing slag, incineration ash and dross

AT MINERAL PROCESSING
5/2009
June 2009
PDF (180 KB)
Impact Stresses for Selective Comminution - For processing slag, incineration ash and dross

Metal-containing waste, e.g. slag, incineration ash and dross, are formed during the production of metals and are to be recycled as waste-derived materials. To obtain an optimal and marketable separated product from the processing of these material groups, the process parameters must be individually adjusted depending on the required final product, but series of tests conducted at the BHS test centre have shown that the above-mentioned wastederived materials can be processed in the same machine systems despite different their material properties.

Size: 180 KB
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