Upgrading iron of refractory hematite and limonite-siderite ores using segregation roasting-low intensity magnetic separation

作者：Xiao, Junhui^*; Zhang, Yushu; Feng, Qiming; Chen, Chao

来源：Journal of Central South University(Science and Technology), 2015, 46(10): 3573-3579.

DOI：10.11817/j.issn.1672-7207.2015.10.003

• Iron concentrates
• Iron ore concentrates
• Low intensity magnetic separations
• Low-intensity
• Magnetic minerals
• Magnetic-field intensity
• Segregation roasting
• Siderite

For the sedimentary pattern hematite and limonite-siderite ores in Qijiang of Chongqing, a segregation roasting-low intensity magnetic separation flowsheet was proposed to upgrade iron. Ores, calcium chloride and coke were mixed and put into roasting furnace to undergo segregation roasting. After being transferred from weak to strong magnetic mineral, iron was recovered by low intensity magnetic separation from roasting ores. The results show that in the roasting ores, new ore phases dominated by magnetite (Fe3O4), metallic iron (Fe) and a few ferrous oxide (FeO) are generated, and effective separation of iron minerals as well as other impurities can be achieved. The iron concentrate separation characterized by 72.02% of iron grade, 0.080% of sulfur mass fraction, 0.053% of phosphorus mass fraction, 82.09% of iron recovery can be obtained under segregation roasting temperature of 950 ℃, segregation roasting time of 60 min, calcium chloride mass fraction of 4%, coke mass fraction of 15%, low intensity magnetic field intensity of 0.10 T and iron ore concentrates mass fraction of 95% of grinding fineness less than 0.038 mm. The effect of upgrading iron is obvious.

• 出版日期2015
• 单位西南大学