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.

This project is funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union. Neither the European Union nor the granting authority can be held responsible for them.

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