Study on Mineralogical Structure of Jidong Magnetite Pellets
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摘要: 对冀东磁铁精粉球团矿的矿相结构进行了系统的研究。结果显示,冀东磁铁精粉焙烧球团矿的主晶相是赤铁矿,焙烧制度和预热制度都影响球团矿的显微特征,当球团矿预热温度950~1 000℃、预热时间20 min时,球团中Fe3O4基本完全氧化,Fe2O3再结晶明显,晶粒开始凝聚。当焙烧温度在1 300℃以上时球团矿有分解型Fe3O4出现,所以焙烧温度应选择在1 300℃以下较为合适。在焙烧温度1 250~1 275℃、焙烧时间大于20 min条件下,球团的抗压强度大于2 000 N/个。Abstract: The mineralogical structure of Jidong magnetite pellets was systematically studied.The results indicated that main crystal phase of Jidong magnetite pellets was hematite,and both roasting and prehea-ting process imposed effect on the microscopic characteristics of the pellets.When preheat temperature is between 950℃ to 1 000℃ and the preheating time is 20 min,Fe3O4 in pellets has been substantially oxidized,and Fe2O3 significantly recrystallized and grain begun to gather.When the roasting temperature excesses 1 300℃ Fe3O4 in pellets began decomposition.,which implies suitable roasting temperature lower than 1 300℃.The combination of roasting temperature at 1 250~1 275℃ and roasting time longer than 20 min.produce Jidong pellets with compressive strength greater than 2 000 N per.pellet.
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Key words:
- pellet /
- magnetite concentrates /
- mineralogical structure /
- preheating /
- roasting
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