Effect of the serpentine on the formation of mineralogical phases and its relation with the mechanical strength in iron ore sinters
DOI:
https://doi.org/10.3989/revmetalm.1995.v31.i6.936Keywords:
Iron ore, Serpentine, Sintering, Mineral phases, Mechanical strengthAbstract
The influence of microstructures formed by serpentine addition on mechanical strength is investigated. It was found that the microstructure formed depends mainly on firing temperature, basicity and serpentine percent. The mineralogical phases present were quantified by the point-count method. The addition of serpentine on acid briquettes (CaO/Si O2 = 0.3), mainly on those fired at 1,275, 1,300 and 1,325 °C, leads to the formation of magnesio-ferrite that diminishes the mechanical strength of fired briquettes, and at the temperature of 1,250 °C the mechanical strength decreases because of the presence of glassy slags. On the other hand, the addition of serpentine on basic briquettes (CaO/Si O2 = 1.2) leads to the formation of olivines and ferrites that improve the mechanical strength of fired briquettes.
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