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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。
The phase structure of Jidong magnet powder pellets was studied systematically. The results show that the main crystal phase of Jidong Magnet Powder Baking Pellets is hematite. Both the calcination system and preheating system affect the microscopic characteristics of the pellets. When pellets preheat temperature is 950-1000 ℃, Preheating time 20 min, the pellet Fe3O4 basically completely oxidized, Fe2O3 recrystallization obvious, the grain began to agglomerate. When the calcination temperature is above 1300 ℃, there are decomposed Fe3O4 in the pellets, so the calcination temperature should be chosen below 1 300 ℃. The compressive strength of the pellets is more than 2 000 N / g at a calcination temperature of 1,250-1,275 ° C and a firing time of more than 20 min.