Hot Metal

Sulphur in the hot metal should be close to final specification level

Silicon content of hot metal determines amount of lime and slag.

Mn in hot metal produces MnO.  MnO tends to retard the dephosphorization of the bath. Mn could be 0.5 to 0.8%

Temperature of hot metal at charging is around . Proportion of hot metal in the charge is 75-90%

Fluxes
Commonly used lime/limestone/ dolomite to bring down the softening point of the oxides, to reduce the viscosity of slag and to decrease the activity of some components to make them stable in the slag phase

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Scrap and ore
Used as coolants to best utilize the excess heat energy. Iron ore is sometimes used by some plant as a coolant and to promote slag formation.

Oxygen
Consumption of oxygen per tonne of steel varies with proportion of scrap and ore, and also with single and multi-hole designs and is approximately   

Source of heat: No external heat. Refining reactions are exothermic

Deoxidisers and alloying elements
Elements like Al, ferrosilicon and ferromanganese are added as deoxidisers. The elements like Cr, Ni V, Nb etc are added as alloying elements. Carbon is added to recarburize steel if required

References:

 S C Koria
      Dynamic variations of lance distance in impinging jet steelmaking processes
      Steel Research, Vol. 59 (1988), No.6, p.257-262.

A.Ghosh and A Chatterjee: Ironmaking and steelmaking