PSP-BOF – Removal of Phosphorus from BOF-slag

Initial situation:

  • Increased cost for raw materials and for landfilling have forced European steelmakers to look for new ways to recycle slag internally in the steel plant or in external applications.
  • The significant amount of slag generated result in serious environmental issues and resource losses.

Working topics:

  • Selection of suitable slags, definition targets for products.
  • Development of cooling strategy for BOF slag.
  • Separation of treated slag into products, i.e. in [P-poor + Fe-rich] and [Fe-poor + P-rich] slag fractions. Transfer into industrial scale.
  • Set up of an oxygen test bay for an indirect slag treatment.
  • Indirect slag treatment at the oxygen test bay and cold slag processing, i.e. grinding and separation, to produce suitable slag fractions.
  • Application and investigation of the industrial produced [P-poor + Fe-rich] slag fraction as sinter feed at sinter pot trials as well as the [Fe-poor + P-rich] slag fractions as fertilizer.

Results:

  • Separate phosphorus from BOF-slag and use as a fertilizer for agriculture and farm production.
  • Remaining slag will be used by internal recycling via sinter plant/blast furnace.
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