难选铁矿磁化焙烧热力学研究  

Thermodynamic Study on Magnetic Roasting of Refractory Iron Ore

作　　者：陈超[1] 张裕书[1] 杨强[2] 

机构地区：[1]中国地质科学院矿产综合利用研究所,四川成都610041 [2]国土资源部矿产资源储量评审中心,北京100000

出　　处：《矿产保护与利用》2013年第5期31-34,共4页Conservation and Utilization of Mineral Resources

基　　金：中国地质大调查项目:渝东典型沉积型赤褐铁矿资源综合利用技术研究(编号:12120113087600)支持

摘　　要：探讨了赤铁矿、菱铁矿、褐铁矿磁化焙烧过程的热力学变化,指出不同矿石焙烧时需要的不同条件,为难选铁矿的磁化焙烧条件的选择提供理论依据。研究表明,赤褐铁矿磁化焙烧可以采用两种方式,即高温低CO浓度焙烧,或低温高CO浓度焙烧,低温焙烧在能耗上有一定优势;菱铁矿可以在中性气氛或弱氧化气氛中完成磁化焙烧,但存在气氛难以控制等问题,通过氧化—还原焙烧,可以方便控制反应气氛;当菱铁矿与赤铁矿的比例大于1∶1时,可以考虑在中性气氛中焙烧,否则,适宜的焙烧方案为氧化—还原焙烧。This paper discusses the thermodynamic process of hematite, siderite, and limonite in magnetic roasting, and states the different conditions for different ores, which provides a theoretical basis for choosing the conditions of magnetic roasting of refractory iron ore. Studies have shown that hematite and limonite can be roasted in two ways, namely, high temperature and low CO concentra- tion roasting or low temperature and high CO concentration roasting, the latter of which has some ad- vantages on energy. Siderite can be roasted in a neutral or a weakly oxidizing atmosphere,but there are some difficult issues to control the atmosphere, which can be solved by oxidation--reduction roasting. When the proportion of siderite and hematite is greater than 1 ： 1, a neutral atmosphere roasting can be considered, otherwise, the appropriate solution is oxidation--reduction roasting.

关 键 词：赤铁矿 菱铁矿 褐铁矿 磁化焙烧 热力学 

分 类 号：TD951.1[矿业工程—选矿] TD925.7