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Some aspects of permeability deterioration in blast furnace process at high rates of pulverized coal injection\udare not well known yet. At operational practice variations in the ash quality of injected coals can affect the furnace\udperformance. Previous work has investigated the behavior of individual coals ash at high temperatures in relation to the\udchemical and mineralogical compositions. This work aimed to assess this behavior for coal blends. Four coals and seven\udblends were selected and ashed at 800-850°C. The samples were analyzed by X-ray fluorescence and X-ray diffraction\udtechniques and ASTM ash fusion (AFT) and viscosity tests were performed. Ash containing high contents of Si and\udAl showed higher fusion temperatures and higher viscosity at 1500°C, due mainly to the higher content of Mullite and\udto the low basicity, while those presenting significant contents of Fe, Ca and S had lower fusion temperatures and lower\udviscosity, due to the higher content of Anorthite and/or to the higher basicity

tecnologia em metalurgia, materiais e mineração

Influência das composições química e mineralógica de cinzas de misturas de carvões para PCI no comportamento de fusibilidade e viscosidade a altas temperaturas