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Steel making

Carmeuse is dedicated to supporting the North American steel industry with a complete range of high quality lime and limestone products, backed by world-class technical and product development support.

Produced to demanding specifications for physical and chemical properties and consistency, Carmeuse products help our steel customers stay in step with evolving quality and environmental requirements while maximizing productivity and efficiency.

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Typically, lime is put to use in three steelmaking processes:

 

  • Electric Arc Furnace (EAF) and Basic Oxygen Furnaces (BOF, QBOP, KOBM): Quicklime (dolomitic and high calcium) is used by steelmakers as a flux agent to efficiently and effectively remove impurities such as phosphorus, silica and alumina from scrap melting in the EAF.  In the Basic Oxygen Process, phosphorus and silica are removed from the liquid pig iron. High quality dolomitic quicklime also helps steelmakers maintain the refractory life of their furnaces and control energy costs in the EAF through the foamy slag process.
  • Secondary steel refining: lime plays a key role in fine tuning steel chemistry, lowering oxygen content, removal of impurities such as sulfur and reduction in inclusions trapped by the basic slag.
    • In stainless steelmaking lime is used in the Argon Oxygen Decarburization Furnace (AOD),
    • Lime is used in these secondary processes, Ladle Metallurgical Furnace, (LMF) and Vacuum Degassing
       

Typically, chemical grade limestone is put to use in four iron making processes:
 

  • Blast Furnace – Chemical grade limestone is utilized to produce the slag which removes impurities from the iron ore reduction process to make the liquid pig iron.
  • Pellet Production – Chemical grade limestone is pulverized and utilized in forming a fluxed iron ore pellet that is used in the blast furnace process.
  • Sinter Production – Chemical grade limestone is crushed and utilized in the sinter process to help flux iron ore and form a porous concentrated iron product used in the blast furnace process. Additional materials such as mill scale can be introduced with the iron ore and agglomerated to a final product.
  • Alternate Ironmaking Processes – In new breakthrough technology in Ironmaking, chemical grade limestone is used in some of these processes to produce a liquid iron.

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