RESEARCH ON MORPHOLOGY OF PHASE COMPONENTS OF IRON SLAGS BY MEANS OF SCANNING MICROSCOPY
Journal Title: Biuletyn Państwowego Instytutu Geologicznego - Year 2012, Vol 452, Issue 452
Abstract
Mineralogical research on iron slags provides information on the phases that come into being in metallurgical furnaces. Their chemical composition is often richer than that of their natural counterparts; they create diverse forms resulting from the variability of crystallization conditions of a slag alloy. It influences the growth and formation of crystals; the same crystal phase may create different morphological forms. Their characteristics were enabled by the research using scanning microscopy.Metallic precipitations and metal oxide phases (wustite, manganosite) create spherical forms. One of the characteristic components of slags among oxides is the solid solution FeO-MgO-MnO, which crystallizes in the skeletal forms. Hematite shows a variety of forms: crust, plates and strips laid in radiant aggregates. Octahedral habits were observed in corundum, which appears sporadically. Among silicates, there were akermanite plates and two-calcium silicates (larnite, bredigite) with a varied habit: poorly formed plates, grains and elongated crystals. The components that crystallize secondarily in pores of the slags stored at dumping grounds are represented by crystallizing gypsum in the needles and fibrous forms, as well as by calcite with the habit of rhombohedrons or spherical precipitations.Such a substantial amount of phase components and the variety of their morphological forms are a proof of the rich and complex phase composition of metallurgical slags, which changes with the type of metallurgical feed as well as additions and fluxes used in the metallurgical process.
Authors and Affiliations
Iwona JONCZY
Keywords
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