Generation, Morphology and Mineralogy of the Dust Particles from Off-Gas Blast Furnace

Résumé

In order to elucidate the morphology and mineralogy of the dust from blast furnace, the fundamental aspects of its generation process were studied. A dust generated by the dry dedusting step of the cleaning process for the BF off-gas was analysed by microscopy and chemical analyses. The results indicated that the shape of particles is predominantly non-regular. We established with approximation the main mineralogical compounds: hematite, magnetite, calcium ferrites, glass and silicate phases. These are in accordance with mineralogy of the feed materials charged into blast furnace and in correlation with the complex processes that are developed into specifical zones where the dust particles were generated. The properties of BF dust and its structural phases are discused in respect to the blast furnace processes, the temperature zones and the gas composition.