关键词: 赤泥, 赤铁矿, 磁铁矿, 磁化焙烧, 物相

Abstract: With the continuous increase of alumina production in China， the discharged amount of red mud is also increasing day by day. The problems of ecological environment pollution and land resource occupation caused by common methods of storage and disposal are becoming more and more prominent. In order to effectively enrich iron in red mud， the technological process of magnetizing roasting-magnetic separation was adopted taken a red mud in Shandong Province as the research object， based on the analysis of ore properties. The results indicated that the iron grade of red mud was 37.37%， and the iron in red mud mainly existed in hematite and limonite， which accounted for 98.23% of the total iron. Iron concentrate with iron grade of 47.01% and recovery of 73.01% could be obtained under the conditions of CO concentration 30%， magnetizing roasting temperature 620 ℃ and roasting time 20 min， roasted products ground to 70% passing 0.038 mm， then via low intensity magnetic separation at magnetic field intensity of 85.6 kA/m. The iron phase analysis， X-ray diffraction analysis and magnetism analysis on iron concentrate indicated that most of the hematite and limonite in red mud could be transformed into magnetite during the magnetizing roasting， the magnetization of iron ore is increased, and the separation of iron minerals and gangue minerals can be realized by low intensity magnetic separation.but further research should be taken aiming at increase of iron grade and decrease of aluminum.

Key words: Red mud, Hematite, Magnetite, Magnetizing roasting, Phase