还原剂种类对高磷鲕状赤铁矿直接还原提铁降磷的影响

以褐煤、烟煤、无烟煤、焦炭为还原剂, 使用直接还原-磨矿-磁选的方法, 对高磷鲕状赤铁矿煤基直接还原提铁降磷过程进行了详细研究。结果表明: 不同温度条件下, 不同还原剂对还原铁的铁品位、铁回收率和磷品位影响趋势相同。在1 150 ℃时, 焦炭对直接还原提铁降磷并没有明显优势, 调节不同煤或者焦炭的用量都可以达到铁品位90%以上, 磷品位0.1%以下, 铁回收率80%以上的指标; 另外煤的变质程度越高, 所需煤用量越少。

Effects of Reductant Types on Direct Reduction and Phosphorus Removal of High-phosphorus Oolitic Hematite Ore

With lignite,bituminous coal,anthracite and coke as reductant,the process of coal-based direct reduction and phosphorus removal of high-phosphorus oolitic hematite was studied by using the technique of direct reduction-grinding-magnetic separation.The results showed that different reductants had similar tendency of impact on the iron grade,iron recovery and phosphorus content under different temperatures.At 1 150 ℃,coke had no obvious advantage in the direct reduction for iron upgrading and phosphorus removal.Adjusting the dosages of different coals or coke can obtain iron grade of over 90%,phosphorus content below 0.1% and iron recovery of 80%.Moreover,the higher the coal rank,the less the coal dosage.