Abstract
Carbon composite pellets composed of hematite, synthetic graphite, and oxide system were reduced at 1773 K (1500 °C) in a laboratory-scale horizontal tube furnace. The morphological properties of produced pellets after reduction were examined using light optical microscopy and a scanning electron microscope. Microscopic observation confirmed the correlation between morphological change of pellets and compositional difference of CaO-SiO2-Al2O3 ternary oxide systems. Samples were also analyzed by X-ray diffraction to investigate phase change during the reduction process. The impact of oxide chemistry was established as each pellet illustrated different states of iron oxide as a function of time. In addition, the surface area was measured by the BET-N2 absorption method to clarify the reaction mechanism which is significantly affected by physical contact.
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