论文部分内容阅读
烧结矿依靠液相黏结未熔颗粒获得强度,因此铁矿粉与Ca O反应生成液相的能力对保证烧结矿质量非常重要。采用高温综合热分析仪(TG-DSC)对塞拉利昂高铝铁矿粉配加Ca O的液相生成特性进行了研究。试验结果表明:提高Ca O的配比,可以增加液相生成量,液相生成峰值温度基本稳定在1 209℃左右;随着矿粉粒度逐渐减小,液相生成量一直减少,同时,液相生成峰值温度先降低后增加,当粒度为0.074~0.180 mm时,液相生成温度最低;熔剂粒度的增加可增加液相生成量,同时初始液相生成温度显著提高;与生石灰(Ca O)相比,采用石灰石(Ca CO3)做钙源可以降低液相生成温度、增加液相量;与其他种类的矿粉对比表明,高铝铁矿粉其液相生成温度最高,反应性最差,Al2O3含量一般的澳大利亚褐铁矿的液相生成温度相对较低,高品位磁铁矿的液相生成温度最低,反应性良好。烧结杯试验表明,随着塞拉利昂铁矿配比的增加,成品率从78.37%逐渐降低到73.36%,烧结矿的转鼓强度由60.5%逐渐下降到49.6%,该高铝矿的配加比例应控制在混匀矿的20%以内。
Sinter relies on liquid phase bonding of unmelted particles to obtain strength, so the ability of iron ore powder to react with CaO to form a liquid phase is very important to ensure the quality of sinter. The liquid phase formation characteristics of Sierra Leone high aluminous iron ore powder with CaO were studied by TG-DSC. The results show that increasing the ratio of CaO can increase the amount of liquid phase, and the peak temperature of liquid phase is basically stable at about 1120 ℃. As the size of ore powder decreases, the amount of liquid phase decreases. At the same time, When the particle size is 0.074 ~ 0.180 mm, the liquid phase formation temperature is the lowest. Increasing the particle size of the liquid phase can increase the liquid phase formation and the initial liquid phase formation temperature increases significantly. Compared with other sources of CaCO3 powder, the temperature of the liquid phase can be decreased and the liquid phase can be increased. Compared with other kinds of ore powder, the high temperature and the low reactivity of the high aluminous iron ore powder, The temperature of liquid phase formation in Australian limonites with relatively low Al2O3 content is relatively low, and the high-grade magnetite has the lowest liquid phase temperature and good reactivity. Sinter cup tests show that with the increase of the Sierra Leone iron ore ratio, the finished product rate is gradually reduced from 78.37% to 73.36%, and the drum strength of sinter is gradually reduced from 60.5% to 49.6%. The proportion of the high-aluminum ore should Control mixed in less than 20% of the mine.