Experimental Study on Gas-based Reduction of Ultra-fine Oolitic High-phosphorus Hematite Powder

The new device was developed for experimental study on gas-based reduction of ultra-fine oolitic high-phosphorus hematite.The phosphorus element existed in the form of apatite and embeded around the oolitic hematite and other gangue.However the iron did not exist with phosphorus element in a chemical combination state.The high-phosphorus hematite was finely ground to an average particle size of 2 μm by ultra-eddy grinding technique,so the effective dissociation of iron and phosphorus elements in the ore was achieved.The reduction results showed that the high reduction degree was achieved by new reduction device.The reduction degree was significantly affected by the particle size.Comparing the common particle size hematite powder(150 μm) and ultra-fine powder,the reduction degree of the latter reached 90%,which increased 30%.There was no sintering happening during reduction process,the preliminary separation of iron and phosphorus elements in the high hematite powder was achieved by simple magnetic separation device.