关键词: 铁尾矿, 磁化焙烧, 磁选, 赤褐铁矿, 磁铁矿

Abstract: In order to determine the suitable conditions of magnetization roasting， the process of magnetization roasting and magnetic separation was adopted to conduct a systematic experimental study on an iron tailings from Anshan Iron and Steel Company. The Influence of roasting temperature， roasting time， reducing gas concentration and gas flow rate on the effect of magnetization roasting were investigated. The results showed that: ① The TFe grade of Anshan iron tailings is 14.70% and the main impurity SiO2 contents is 66.17%. The contents of harmful elements， such as phosphorus， sulfur and sodium are less. The iron in the iron tailings mainly exists in the form of hematite and limonite， with the distribution rate of 83.87%. The main useful minerals in the iron tailings are magnetite and hematite， and the main gangue mineral is quartz. ② The suitable roasting conditions of the iron tailings are as follows: roasting temperature of 580 ℃， roasting time of 5 min， CO concentration of 30%， gas flow rate of 500 mL/min. Under the suitable conditions， magnetic concentrate with TFe grade of 62.17% and TFe recovery rate of 84.02% was obtained by low intensity magnetic separation of the roasted products with the magnetic field intensity of 87.12 kA/m. ③ The results of iron phase analysis of roasted products showed that the contents and distribution of magnetic iron in the samples were significantly increased after magnetization roasting， while the contents and distribution of iron in hematite and limonite were significantly decreased. The results of XRD patterns of products with different calcination time further indicate that hematite in iron tailings is transformed into magnetite. The research results could provide reference for the development and utilization of tailings of the same type.

Key words: iron tailings, magnetization roasting, magnetic separation, hematite and limonite, magnetite