东鞍山浮选尾矿预富集精矿悬浮磁化焙烧试验研究

为实现东鞍山铁矿石浮选尾矿的资源化利用，对浮选尾矿预富集精矿开展了悬浮磁化焙烧试验研究.结果表明，浮选尾矿预富集精矿主要矿物组成为赤褐铁矿、磁铁矿、菱铁矿和石英，TFe品位为31.13%.浮选尾矿预富集精矿适宜的悬浮磁化焙烧工艺参数为:气体流量600mL/min，氢气体积分数20%，焙烧温度520℃，焙烧时间20min.焙烧产品经弱磁选可得铁精矿的TFe品位为64.23%，回收率为79.53%.焙烧产品的铁物相，XRD，VSM分析表明，经过悬浮磁化焙烧后，原矿中赤褐铁矿和碳酸铁转变为磁铁矿，矿石的饱和磁化强度和磁化率增强.

Experimental Study on Pre-concentration and Suspension Magnetization Roasting of Donganshan Iron Ore Flotation Tailing

To achieve the utilization of the flotation tailing of Donganshan iron ore， pre-concentration and suspension magnetization roasting tests were carried out. The results indicate that pre-concentration of the flotation tailing mainly consists of hematite， limonite， siderite and quartz， and iron grade is 31.13%. The appropriate suspension magnetization roasting conditions were determined as roasting temperature of 520℃， roasting time of 20min， H₂ concentration of 20%， and gas flow rate of 600mL/min. The roasted product was benefited by low-intensity magnetic separation， and the concentration with iron grade of 64.23% and recovery of 79.53% was obtained. The analysis on roasted product by physical iron phase， XRD， and VSM indicates that the hematite， limonite， and siderite are reduced to magnetite during the suspension magnetization roasting process， and the saturation magnetization and magnetic susceptibility obviously increase.