中文摘要：

研究高磷褐铁矿工艺矿物学的特性,开发钠盐强化还原焙烧—磁絮凝提铁脱磷的新工艺。采用光学显微镜、XRD和EDAX分析研究焙烧前后相关产品的微观特征,并对精矿TFe品位以及P含量进行分析。研究结果表明：褐铁矿主要为针铁矿和赤铁矿的复合矿物;磷主要以氟磷灰石（Ca5（PO4）3F）的形式存在。在温度为1 050℃,m（煤）/m（矿）为3：20的条件下,还原120 min后焙烧矿样中铁粒径小,磷铁分离困难;当添加10%的Na2CO3后,焙烧矿中铁粒径粗化,金属铁的衍射峰值强度增强。还原矿样磨至〈26μm粒级含量约占90%时,采用磁絮凝可制备出TFe 69.87%、含磷0.28%、铁回收率为78.18%的铁精矿。添加Na2CO3可提高FeO的还原反应活度,优化还原过程中传热和传质条件,强化氧化铁的还原;磁絮凝则强化了细粒级磁性矿物的回收。

英文摘要：

Sodium-salt-added reinforced reductive roasting-magnetic flocculation process,a new process for up-grading and dephosphorizing of high phosphorus limonite ore was developed based on the investigation on properties of mineralogy.The microstructure characteristics of iron minerals were investigated with optical microscopy,XRD,and EDAX measurements after and before reductive roasting samples.TFe and P contents of concentrate sample were analyzed.The results show that iron minerals are hematite and goethite mainly,and the phosphorus mainly occurs as fluorapatite.Iron particle size of reduction sample is small and the separation of iron and phosphorus is difficult under the conditions of 1 050 ℃,mass ratio of bituminous coal to ore of 3：20 and reducing duration of 120 min.With 10% of Na2CO3,iron particle size of reduction sample is coarse and the diffraction intensity of iron increases.Then,magnetic flocculation is conducted following ultrafine grinding（approximately 90% passing 26 μm）.A concentrate with 69.87% Fe,at a recovery of 78.18%,is obtained with simultaneous decrease in the phosphorus content down to 0.28%.Adding Na2CO3 can increase reducing reaction activity of FeO,and the mass and heat transfer condition of reducing reaction is optimized,and the reduction of iron oxide can be promoted.However,the recovery of fine magnetic minerals is reinforced by magnetic flocculation.