镜铁矿微波磁化焙烧过程物相与微观结构变化  

Microstructure Characteristics and Phase Transformation of Specularite during Microwave Magnetic Roasting Process

作　　者：马浩[1] 陈铁军[1] 袁益忠[1] 

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081

出　　处：《钢铁钒钛》2015年第4期128-133,共6页Iron Steel Vanadium Titanium

摘　　要：以酒钢镜铁矿粉矿为原料,在微波马弗炉内磁化焙烧,考察该粉矿在微波场下的升温行为,焙烧前后物相变化以及微波加热对矿物内部结构的影响。结果表明:该粉矿吸波性能良好,能在15 min内被微波加热至500℃以上;通过扫描电镜观测常规磁化焙烧样与微波磁化焙烧样内部生成的磁铁矿均有不同程度裂纹产生,但裂纹形式并不相同。常规磁化焙烧过程主要为菱铁矿分解促使矿物内部产生龟裂;而微波磁化焙烧样矿物内部裂纹分布更为广泛,除菱铁矿产生龟裂外,其主要含铁矿物镜铁矿内部以及镜铁矿与脉石接触面上也产生大量裂纹,经分析认为这是由于微波选择性加热促使矿物内部产生内应力,最终因内应力过大产生裂纹。Through microwave magnetizing roasting the Jiugang＇s specularite in the high temperature microwave reactor,the heating characteristic of specularite under microwave treatment,phase transformation before and after magnetic roasting and the effect of microwave heating on the microstructure were investigated. It was shown that the mineral absorbed microwave power effectively and could be heated up to more than 500 ℃ in 15 minutes by microwave heating. SEM analysis indicated that intergranular fractures occurred both in the conventional heated sample and microwave heated sample,but the form of crack was different. The crack in the sample by conventional magnetizing roasted was mainly caused by siderite decomposition,but the crack in the sample by microwave heated widely distributed in the siderite and also the specularite and the interface between specularite and gangues. These crack are expected being caused by excess internal stress due to the selective microwave heating result.

关 键 词：镜铁矿 微波 磁化焙烧 裂纹 

分 类 号：TD951[矿业工程—选矿]