Dilatometric Characterization of Direct Reduction Pellets
Journal Title: International Journal of engineering Research and Applications - Year 2017, Vol 7, Issue 10
Abstract
During the reduction process, the increase in volume of the iron ore pellets leads to a decrease in the mechanical resistance or disintegration of the pellets which lead to the unfeasibility of the process. The present work has the objective of evaluating the thermal expansion behavior of the direct reduction pellets using dilatometry. For this, the dilatometric expansion curve and the coefficient of thermal expansion of the pellets were determined through a horizontal pushrod dilatometer under an argon atmosphere. The dilatometric results showed that the expansion of the pellet increased and the degree of expansion decreased as the temperature increased, and changes in the expansion curve demonstrated the occurrence of microstructural transformations due to the presence of MgO and SiO2 in the composition of the pellet. The pellets were submitted to thermal cycles with a gradual increase of temperature up to 600°C, 900°C, 1000°C and 1050°C, which presented similar results of coefficient of expansion and made it possible to relate the dilatometric results with the compressive strength of the pellets, which intensified with material expansion to the temperature of 1000°C and showed significant loss of strength when exhibited shrinkage in the temperature range of 1000-1050°C
Authors and Affiliations
Evandro Virgolino Gonçalves, Daiane Cardial, Gláucio Soares da Fonseca, José Adilson de Castro
Keywords
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