摘要:
通过研究承钢三种含铁精粉(黑山精粉、承德普通精粉、小营精粉)的矿相结构,差热分析及烧结特性,结果表明:三种铁矿粉均为典型的磁铁矿,铁品位、SiO2含量较低,TiO2、Al2O3、FeO含量较高;根据差热分析,三种矿粉均主要以磁铁矿形式存在,没有赤铁矿包裹磁铁矿的情况,矿粉增重的初始温度都比较低,高温区间TG曲线上升的斜率相同,均符合磁铁矿的氧化动力学条件;三种铁精粉单烧的垂直烧结速度慢,废气温度较低,烧损率较低,转鼓指数均较低,黑山精粉的转鼓指数最低,仅有55.33%;经混料烧结后,烧结矿转鼓指数得到明显提升,最高达到64.40%。研究结果为中钛型钒钛磁铁矿烧结提供了理论基础。
Abstract:
Mineral phase structure,differential thermal analysis and sintering experiment had been performed on three kinds of iron concentrate powder.Phase structure results show all three kinds of iron ore fines are typical magnetite iron grade with lower content of SiO2,and higher TiO2,Al2O3,FeO.Differential thermal analysis result indicates that all three kinds of ore dominate by magnetite and show no sign of hematite covering magnetite.Besides,all present lower initial temperature when slag weight gain,same slope of high-temperature range TG curve,and satisify magnetite oxidation kinetics conditions.All ore powders are characterized by slow sintering,lower exhaust gas temperature,low burning rate and lower drum index as well.Heishan concentrate shows lowest tumbler index of 55.33%,however,this value increase up to 64.40% after mixing sintering.
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