Effects of Liquidus Temperature and Liquid Amount on the Fluidity of Bonding Phase and Strength of Sinter
Effects of Liquidus Temperature and Liquid Amount on the Fluidity of Bonding Phase and Strength of Sinter
复制标题
液相线温度和液量对粘结相流动性和烧结矿强度的影响
DOI：
10.2355/isijinternational.isijint-2020-243
复制
发表时间：
2021-01-01
影响因子：
1.8
通讯作者：
Shen, Fengman
中科院分区：
文献类型：
--
作者：
Jiang, Xin;Zhao, Jidong;Shen, Fengman
流动性是烧结过程中粘结相的重要性能之一，良好的流动性有利于提高烧结矿的强度。研究了固相线温度和液量对粘结相流动性和烧结体强度的影响。在SiO_2-Fe_2O_3-CaO体系中的实验结果表明，对于SiO_2=5%和SiO_2=10%，随着Fe2O_3含量的增加(CaO含量的减少)，样品的流动性指数呈现先增大后减小的趋势。相线温度越低，液量越大，SFC样品的流动性指数越高，反之亦然。烧结罐试验结果表明：(1)对于SiO_2=4.30%的铁矿，烧结矿中主要物相为赤铁矿和SFCA，液态SFCA相在烧结矿中分布均匀。在较宽的碱度范围1.8~2.2范围内，烧结矿的碾压强度大于60%。(2)对于SiO_2=12.42%的铁矿，橄榄石是另一种主要物相，在部分烧结矿中分布不均匀。烧结矿的碾压强度在碱度为2.0时有一峰值。碱度过高或过低，翻滚强度急剧下降。高SiO_2含量的烧结矿的合理碱度难以确定，不建议在实际烧结生产中使用。研究结果可为更好地理解粘结相的性质和提高烧结矿的强度提供指导。
Fluidity is one of the important properties of bonding phase in sintering process, because better fluidity is beneficial for improving the strength of sinter. In this work, the effects of liquidus temperature and liquid amount on the fluidity of bonding phase and the strength of sinter were investigated. The experimental results in SiO 2 –Fe 2 O 3 –CaO system indicated that, for both SiO 2 = 5% and SiO 2 = 10%, with increasing Fe 2 O 3 content (decreasing CaO content), the fluidity indices of samples first increased and then decreased. When the liquidus temperature was lower and the liquid amount was more, the fluidity index of SFC sample was higher, and vice versa. The sinter pot experimental results showed that, (1) for the iron ore with SiO 2 = 4.30%, the major phases in the sinter were hematite and SFCA, and the liquid SFCA phase was evenly distributed in sinter. The tumble strength of sinter was higher than 60% in a wider basicity range of 1.8–2.2. (2) For the iron ore with SiO 2 = 12.42%, the olivine was another major phase, and was unevenly distributed in part of sinter. There was a peak value for tumble strength of sinter when the basicity was 2.0. The basicity was higher or lower, the tumble strength sharply decreased. The reasonable basicity of sinter with high-SiO 2 content was difficult to determine, and was not proposed to be used in an actual sintering production. The outcomes of the present work may provide guidelines for better understanding the properties of bonding phase and improving the strength of sinter.