|Cite this article as:|
|Shichao Wu, Zhengyao Li, Tichang Sun, Jue Kou, and Xiaohui Li, Effect of additives on iron recovery and dephosphorization by reduction roasting-magnetic separation of refractory high-phosphorus iron ore, Int. J. Miner. Metall. Mater.,(2021). https://doi.org/10.1007/s12613-021-2329-8|
The effect of CaCO3, Na2CO3 and CaF2 on the reduction roasting-magnetic separation of high-phosphorus iron ore containing phosphorus as Fe3PO7 and apatite was investigated. The result shows that Na2CO3 had the best effect on iron recovery and dephosphorization, followed by CaCO3, while CaF2 had almost no influence. The mechanism of CaCO3, Na2CO3 and CaF2 was studied by XRD and SEM-EDS. It turns out that Fe3PO7 was reduced to elemental phosphorus and formed iron phosphorus alloy with metallic iron without additives. The addition of CaCO3 reacted with Fe3PO7 to generate massive Ca3(PO4)2 and promoted the reduction of iron oxides, however, the growth of iron particles was inhibited. After adding Na2CO3, the phosphorus in Fe3PO7 was transferred to nepheline and Na2CO3 improved the reduction of iron oxides and the growth of iron particles, therefore, the recovery of iron and the separation of iron and phosphorus achieved the best. CaF2 reacted with Fe3PO7 to form fine Ca3(PO4)2 particles scattered around the iron particles, which made the separation of iron and phosphorus difficult.