关键词: 鲕状赤铁矿, 高磷铁矿石, 磁化焙烧, 酸浸, 生物浸出, 除磷

Abstract: Roasting -magnetic separation was used to treat a high-phosphorus oolitic hematite in western Hubei(iron grade at 43.50%)，dephosphorization methods，including acid leaching and bioleaching，were used for the iron concentrate.The results showed that,under the condition of roasting at 850 ℃ for 25 min，reductant to ore ratio of 5%，grinding time of 4min，magnetic field strength 120 kA/m，the iron concentrate grade was 54.92%，iron recovery rate was 86.78%，with P 0.83%; in the acid leaching test，pulp density was 2%，with 0.1 mol /L of H₂SO₄，HNO₃，HCl，C₂H₂O₄，C₆H₈O₇ for phosphorus removal，in which H₂SO₄ was the most effective，and the iron grade，recovery rate，phosphorus removal rate were 57.98%，96.47%，95.30%，respectively; in the bioleaching test，pulp density was 2%，with the filtrate of the Acidophilic Thiobacillus ferrooxidans (At.f)  and the  Aspergillus niger  on iron concentrate ore，the phosphorus content were  0.23%, 0.20%, respectively.

Key words: Oolitie Hematite, High Phosphorus ore, Magnetic roasting, Acid leaching, Bioleaching, Dephosphorization