Efficiently Produce Iron Concentrate from High-Purity Pyrite

The study attempts to produce iron concentrate from a high-purity pyrite concentrate using oxidizing roasting at industry scale. The effect of key parameters, i.e., roasting temperature, excess air coefficient and roasting intensity on the Fe and S content in the pyrite cinder was fully investigated. The results indicate that the roasting temperature plays a key role in decrease the S content in the pyrite cinder; an increase in the roasting temperature from 800°C to 950°C decreased the S content in the pyrite cinder remarkably from 0.43% to 0.18%. The optimum conditions for produce a high quality iron concentrate from the high-purity pyrite concentrate were identified as roasting temperature around 900 ~ 950°C, excess air coefficient at 1.20 and roasting intensity at 4.36 ~ 5.61 t / m2•day. Under such a condition, high-quality iron concentrate containing 65.11% Fe and 0.21% S was achieved from the pyrite concentrate.