还原剂对高磷鲕状赤铁矿直接还原同步脱磷的影响

摘要

讨论还原剂对鄂西高磷鲕状赤铁矿直接还原同步脱磷的影响,研究在固定脱磷剂用量下,还原剂用量对还原铁中铁、磷含量及铁回收率的影响,并研究其焙烧产物.结果表明:还原剂中固定碳及挥发分对还原铁中铁品位及铁回收率的影响较大,灰分对还原铁中磷品位的影响较大;当使用同一还原剂时,焙烧产物中金属铁含量随还原剂用量的增加而增加,浮氏体含量随还原剂用量的增加而降低,还原剂用量的增加会减弱脱磷剂与矿石中主要脉石矿物生成铝硅酸钠的趋势;当还原剂用量相同时,活性炭、焦炭、无烟煤和褐煤所得焙烧产物中金属铁含量逐渐增加,浮氏体含量逐渐降低;在这4种还原剂中,褐煤直接还原同步脱磷的效果最好,无烟煤和焦炭次之,活性炭的效果最差.%With a high-phosphorus oolitic hematite ore as the sample, the effects of reductants on direct reduction and synchronous dephosphorization were investigated, the effects of different solid reductant dosages on the contents of Fe and P as well as iron recovery in direct reduced iron (DRI) at a fixed dephosphorization agent dosage were studied, and the roasted products were also discussed. The results show that the fixed carbon and volatile in the reductants have a great influence on Fe grade and recovery of directiron, and the ash has a great effect on P grade of the direct iron. The contents of Fe and wustite in the roasted products increase and decrease respectively by increasing the dosage of reductants, the trend of sodium aluminosilicate generated from the reaction of dephosphorization agent and the gangue minerals can be reduced by increasing the dosage of reductants. Under the same dosage of reductants, the highest content of Fe in the roasted product is produced by using activated carbon as reductant, followed by coke, anthracite and lignite, the content of wustite in the roasted products is gradually decreased. Among these solid reductants, lignite has the best effect of direct reduction and synchronous dephosphorization, while anthracite and coke take the second place, and activated carbon has the worst effect.