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本文采用各种主要分析和鉴定手段,研究了承德钒钛磁铁精矿球团氧化固结机理及氧化动力学;用数学方法,分析了影响球团矿质量的主要因素,并对因素取值进行了优化研究。 研究表明:900℃是承德钒钛磁铁精矿球团氧化动力学限制环节的转折点。因此,铁精矿球团氧化温度不宜高于1000℃;矿粉变细,氧化温度亦应降低。该矿球团氧化固结过程分为三个阶段,即氧化阶段,赤铁矿再结晶固结阶段和有液相参加下的赤铁矿“细粒化”及再结晶长大、晶粒连接成片阶段,球团合理的焙烧温度不得低于1250℃。优化计算得出了获得优质球团矿的最佳工艺参数组合.提出了改进承钢球团矿质量的建议。
In this paper, by means of various major analysis and identification methods, the oxidation and solidification mechanism and oxidation kinetics of Chengde vanadium-titanium magnetite pellets were studied. The main factors affecting the pellet quality were analyzed by mathematical methods. Optimized research. The results show that 900 ℃ is the turning point of the oxidation kinetics of Chengde vanadium-titanium magnetite pellets. Therefore, the iron oxide pellets oxidation temperature should not be higher than 1000 ℃; mineral powder narrowing, the oxidation temperature should also be reduced. The ore pellet oxidation and consolidation process is divided into three stages, that is, the oxidation stage, hematite consolidation stage and hematite with the participation of liquid phase “granulation” and recrystallization and growth, grain connections Into the film stage, the pellet reasonable baking temperature of not less than 1250 ℃. The optimal process parameters for obtaining high quality pellets are obtained through optimization calculation. Proposals to improve the quality of steel balls are presented.