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采用唐山本地磁铁矿及高钙粉混合造球,配合X-射线衍射分析、高温综合热分析等测试手段,同时运用Fact Sage热力学模拟,探究碱度及温度变化对球团矿抗压强度的影响规律。结果表明:随着碱度的增加,球团矿抗压强度呈先上升后下降的趋势,且在碱度为1.0,焙烧温度控制在1 250℃时焙烧球团矿抗压强度达到最大。适量的液相有助于Fe3+迁移,赤铁矿结晶良好,球团矿抗压强度较大;过量的液相阻碍Fe3+迁移,赤铁矿与赤铁矿之间的再结晶受到限制,球团矿抗压强度降低。
In this paper, Tangshan local magnetite and high calcium powder are used for pelletizing, and combined with X-ray diffraction analysis and high-temperature comprehensive thermal analysis, the author uses Fact Sage thermodynamic simulation to explore the effect of alkalinity and temperature on pellet compressive strength Affect the law. The results show that with the increase of alkalinity, the compressive strength of pellets first increases and then decreases, and the compressive strength reaches the maximum when the basicity is 1.0 and the calcination temperature is controlled at 1 250 ℃. The proper amount of liquid phase can help the migration of Fe3 +, the crystallization of hematite is good and the compressive strength of pellets is relatively large. Excess liquid phase hinders the migration of Fe3 + and the recrystallization between hematite and hematite is restricted. Mine compressive strength decreased.