Improvement of roasting and metallurgical properties of fluorine-bearing iron concentrate pellets

Abstract

The effects of titanium slag on the roasting and metallurgical properties of fluorine-bearing iron concentrate pellets were experimentally investigated in this study. Results show that the compression strength of fluorine-bearing iron concentrate pellets improved up to 3700 Newton/Pellet and the suitable range of roasting temperatures expanded 150 °C with the addition of titanium slag. The results of the scanning electron microscope and energy dispersive spectrum showed that the main phases of fluorine-bearing iron concentrate pellet with titanium slag were hematite, rutile, Fe2TiO5 and silicates. Moreover, the metallurgical properties of roasted fluorine-bearing iron concentrate pellets were improved by adding titanium slag. The softening range of roasted fluorine-bearing concentrate pellets decreased from 106 °C to 59 °C. The reduction swelling index of the roasted fluorine-bearing iron concentrate pellets decreased from 22.76% to 14.26% with the addition of titanium slag.