高磷鲕状赤铁矿氢基矿相转化强化提铁脱磷高效利用技术研究

Research on efficient utilization of high-phosphorus oolitic hematite for iron enrichment and dephosphorization by hydrogen mineral phase transformation

本文针对高磷鲕状赤铁矿工艺矿物学特性及其难以利用传统选矿技术进行分选的难点,创新提出氢基矿相转化−磁选−酸浸高效提铁脱磷的新技术,探明了高磷鲕状赤铁矿氢基矿相转化过程中还原温度、还原时间、还原剂浓度等对分选效果的影响规律,通过技术优化获得了铁精矿铁品位65.05%、铁总回收率81.86%、磷含量0.081%的技术指标;采用XRD、VSM、XPS、SEM等检测分析手段探明了矿物物相、磁学特性、微观结构的演变规律,查明了铁矿物转化程度与分离效果之间的匹配机制,查明了高磷鲕状赤铁矿氢基矿相转化及分选过程中铁、磷等组份的富集迁移规律。研究成果为高磷鲕状赤铁等复杂难选铁矿高效利用提供了新技术借鉴和理论支撑。

The paper proposes the innovative technology of hydrogen mineral phase transformation−magnetic separation−acid leaching for iron enrichment and dephosphorization,based on the mineralogical characteristics of high phosphorus oolitic hematite and difficulties that make it difficult to utilize traditional beneficiation for separation.The influences of the reduction temperature,reduction time,and reductant concentration during hydrogen mineral phase transformation on the separation index of high phosphorus oolitic hematite were investigated.The optimal conditions were determined to be a reduction time of 25 min with a reductant concentration of 30%and a reduction temperature of 540℃,under which an iron grade of 65.05%,iron total recovery of 81.86%,and phosphorus content of 0.081%were obtained for the iron concentrate.The evolution of mineral phases,magnetic properties,and mineral microstructures was investigated by XRD,VSM,XPS,SEM,and BET.The results provide new references of technology and theoretical support for the efficient utilization of refractory iron ores.