Module 3: :Ladle Metallurgy
  Lecture 23: Injection ladle metallurgy


Injection of solid powders

Injection techniques have the advantages of dispersing the reactants in the steel bath and at the same time provide a large reaction surface area. The type of powders used is governed by the purpose of injection. Table below shows the slag forming materials used for injection.

Purpose

Type of powder

Dephosphorization

CaO+CaF2+Fe2O3+ mill scale soda

Desulphurization

CaO +Al
CaO + CaF2 +Al
Ca C2
Mg+(MgO,Al2O3, chloride slag)
CaC2+ CaCO3, CaO

 

Alloying

Fe Si, CaCN2, NiO, Mo O2
Fe B, Fe Ti etc

Deoxidation and inclusion shape control

Al, Ca Si, Ca, Si, Mn, Al,
Ca Si and  Ba