SULFURIZATION MECHANISM OF WUSTITE

order to investigate the mechanisms of sulfurization iron oxide such a s the formation of iron sulfide dust during smelting reduction of iron ore, wustite samples synthesized to some specific compositions as wel l as magnetite and metallic iron were sulfurized mainly at 900 degrees C in a controlled sulfur partial pressure. The degree of sulfurizatio n reaction was thermogravimetrically monitored for each experiment and several samples were subject to XRD, SEM and EDX analyses. The rate c ontrolling step of sulfurization reaction has been considered to be th e diffusion of iron in the FeS layer produced, and its diffusion coeff icient at 900 degrees C is estimated to be 4.7-7.0 x 10(-9)cm(2)/s.