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。
The mineralogical structure of Jidong magnetite pellets was systematically studied. The resultsindicated 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 isbetween 950 ℃ to 1 000 ℃ and the preheating time is 20 min, Fe3O4 in pellets has been substantiallyoxidized, and Fe2O3 significantly recrystallized and grain begun to gather. When the roasting temperatureexcesses 1 300 ℃ Fe3O4 in pellets began decomposition., which implies suitable roasting temperaturelower than 1 300 ℃. The combination of roasting temperature at 1 250~1 275 ℃ and roasting time longerthan 20 min. produce Jidong pellets with compressive strength greater than 2 000 N per.pellet.
出处
《钢铁钒钛》
CAS
北大核心
2014年第6期124-129,共6页
Iron Steel Vanadium Titanium
基金
国家自然科学基金重点支持联合基金项目(U1360205)
河北省高等学校科学技术研究优秀青年基金项目(Y2011116)
关键词
球团矿
磁铁精粉矿
矿相结构
预热
焙烧
pellet
magnetite concentrates
mineralogical structure
preheating
roasting
