Investigation of Modifying Treatment with Rare-Earth Oxide for High-sulphur Moltem

Applying solid slag Cakes of rare earth oxide as a desulphurizinga gent as well as a modifying agent and under Condition of Ar-blowing, a hy-pereutictic hot metal of high Sulphur content (s=0.100%) has been mo-difyied. Experiments are made at 1450 ℃ for about 30~35 minutes.
Changeing laws of chemical composition in hot metal and relationship between graphite morphogy and contentof RE, CE in casting are abta-ined. Results indicate that the RE% ≤ (CE%-4.30%)/25 and the RE% ≥ (CE%-4.30%)/25 canbe abtained vermicalar cast iror and nodular cast iron respectively under hypereutectic hot metal. with regrad to disuph-urizing reaction and redwction reaction of rare earth oxrde, discussion and thermodynamic calculation have been Carried out. The results point out that the above mentioned reaction are all established thermodyra-mically umder the experimental condition.