The kinetics of molten iron desulfurization using magnesium vapor

Magnesium vapor was injected into 60 kg heats of carbon-saturated iron at 1523 K

G. A. Irons; R. I. L. Guthrie

2007

Key concepts

Scholarcy highlights

  • Magnesium vapor was injected into 60 kg heats of carbon-saturated iron at 1523 K
  • The magnesium dissolution and desulfurization rates as well as magnesium bubble size were monitored over sulfur contents ranging from 0.0002 to 0.2 pct S
  • Further analysis indicated that most of the desulfurization took place at magnesium sulfide inclusions present in the bath; there was good agreement between the experimental precipitation rate constant and that predicted for diffusion to the number of inclusions observed by chemical analysis and inclusion counts
  • The seed magnesium sulfide inclusions were probably stripped from the ascending magnesium bubbles
  • These particles were quickly eliminated from the melt by bubble and induction stirring, resulting in a steady-state number of inclusions
  • This allowed a pseudosteady-state model to be developed

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