Effects of Sulfur on High Temperature Softening-melting Properties of Acid Pellets

Abstract

Effects of H₂S on the softening-melting properties of pellets during reduction under load have been experimentally studied with seven different brands of industrial pellets and an Fe₂O₃ pellet as samples. The results show that the presence of H2S in reducing gas has detrimental effects on the high temperature properties of the pellets. For example, the addition of only 0.1% of H₂S to 35%CO-65% N₂ gas mixture increased extremely the shrinking velocity of the pellets due to softening, although it hardly affected the reduction rate. Formation of easy-melting eutectic liquid from FeS and FeO has been found to be the main cause of the above-mentioned effects.