中文摘要：

采用微波碳热还原技术,对白云鄂博中贫氧化矿进行磁化焙烧,研究了微波焙烧温度、配碳量、保温时间对其磁化率的影响规律以及温度对磁选效果的影响。结果发现：在650℃,0.5%配碳量,焙烧10min的条件下矿物的还原效果最佳,其磁化率为2.36,接近理论值。由于矿粉高温下有烧结现象,570℃焙烧矿磁选精矿的品位最高。精矿经再磨再选,通过控制二次磁选的磁场强度,可分别获得品位65%和回收率58.6%,或品位63%和回收率72.8%的铁精矿。铁精矿中P,S,SiO2,K2O含量较低,基本达到炼铁入炉要求,稀土在尾矿中富集2倍多。

英文摘要：

Microwave-assisted magnetizing roast plus magnetic separation was carried out upon Baiyunebo medium-low grade oxidized ores containing hematite.The effects of sintering temperature,carbon content,sintering time on the reduction and the effects of sintering temperatures on the magnetic separation effect were investigated.The results showed that in the case of roasting temperature of 650 ℃,carbon content of 0.5% and roasting time of 10 min,the best magnetisability 2.36 could be obtained,near to the theoretical value 2.33.But owing to powder sintering at high temperatuer,the best magnetic separation efficiency occurs for the sintered ore at 570 ℃,insteads of 650 ℃.For this concentrate,a further ball-milling plus magnetic separation produces two kind of final concentrate,according to the different stiring current one is in grade 65% and recovery 58.6%,the other is in grade 63% and recovery 72.8%.In this two concentrates,the content of impurity elements such as S,P,SiO2,K2O etc.were so low as to meet the require of iron-smelting,while the rare earth was found enriched up to twice and more in the resulting tailings.