Green and efficient separation of iron and phosphorus from high-phosphorus oolitic iron ore by reduction roasting without a dephosphorization agent

Abstract

To provide a new method for the dephosphorization of high-phosphorus oolitic iron ore (HPOIO) by reduction roasting, the feasibility of the high-efficiency separation of iron and phosphorus by reduction roasting and magnetic separation process (RRMSP) without a dephosphorization agent was studied. The results showed that the full separation of iron and phosphorus was achieved without a dephosphorization agent. Under optimal conditions, powdery reduced iron (PRI) with 92.77% iron and 0.09% phosphorus content was produced. Iron recovery and dephosphorization reached 68.70% and 93.50%, respectively. In a weak reducing atmosphere, apatite was not reduced. A portion of the phosphorus in the iron minerals formed apatite, and the remaining phosphorus entered fayalite. Metallic iron and phosphorus minerals were physically separated. Compared with the addition of dephosphorization agent, clean production was realized without the addition of dephosphorization agent, but the iron recovery was not ideal; the economic benefits should be further studied in the future.