Abstract: 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.

Key words: oolitic high-phosphorus hematite, ultra-fine powder, dissociation of iron and phosphorus, gas-based reduction

摘要： 使用新开发装置对高磷赤铁矿超细粉进行气基还原实验研究. 该矿中P主要以磷灰石形式嵌布于鲕状赤铁矿和其他脉石颗粒之间，但Fe和P元素未处于化学结合状态. 采用超级涡流磨技术将高磷赤铁矿磨成平均粒度为2 mm的超细粉，实现Fe和P元素较好的解离. 还原实验结果表明，使用新开发的还原装置实现了矿粉的高度还原；粒度对还原结果的影响最显著，超细矿粉(2 mm)的还原度可达90%，较常规粒度矿粉(150 mm)提高约30%；还原产物颗粒间并未发生烧结，采用简易磁选设备对还原产物进行磁选分离，初步实现矿粉中Fe与P元素分离和富集.

关键词: 鲕状高磷赤铁矿, 超细粉, Fe与P解离, 气基还原