1.Department of Exploitation and Utilization Technology for Mineral Resources, Changsha Research Institute of Mining and Metallurgy Co., Ltd., Changsha 410012, Hunan, China;2.School of Metallurgical Engineering, Anhui University of Technology, Ma′anshan 243032, Anhui, China;3.Xinyu Xinliang Special Steel Co., Ltd., Xinyu 338013, Jiangxi, China
Abstract：Abstract：Microwave heating was used to reduce carbon-containing pellets in the pseudohematite. The effects of reduction temperature, alkalinity and additive dosage on the migration of phosphorus-containing components were investigated. The mechanism of iron removal and dephosphorization by microwave carbothermal reduction was analyzed. The experimental results show that the phosphorus-containing components are gradually reduced with the increasing of reduction temperature. When the reduction temperature reached above 1150℃, a large amount of phosphoruscontaining minerals were reduced and enriched in the reduced iron, resulting in excessively high P content of the reduced iron powder. At lower reduction temperature, the reduction of phosphorus-containing components can be effectively suppressed and the reduction and aggregation of iron oxides can be promoted by selecting the appropriate alkalinity and dephosphorization agent. The optional experimental conditions for iron increasing and phosphorous reduction are as following: the grain size of raw ore is 0.8 mm, the alkalinity is 0.8, the C/O molar ratio is 1.0, the amount of dephosphorization agent is 20 mass%, the reduction temperature is 950℃, the reduction holding time is 10 min, the grind size for separation is 74μm, and the magnetic field intensity is 65 mT. The total iron content, iron recovery and phosphorus content of reduced iron powder are 82.79 mass%, 8649% and 0.34 mass%, respectively. The reduced iron powder is basically free of impurities and has a high purity, and phosphorous mainly exist in slag in the form of phosphate.
陈雯1，雷鹰2，何文浩3，廖振鸿1，王鑫2. 鲕状赤铁矿微波加热还原提铁脱磷机制[J]. 钢铁研究学报, 2020, 32(1): 9-19.
CHEN Wen1,LEI Ying2,HE Wen-hao3,LIAO Zhen-hong1,WANG Xin2. Iron increase and phosphorous reduction mechanism of oolitic hematite by microwave heating. JOURNAL OF IRON AND STEEL RESEARCH , 2020, 32(1): 9-19.
2020, Vol. 32 
