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Effect of iron ore particle assimilation on Sinter structure

机译：铁矿石颗粒同化对烧结矿结构的影响

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The properties of the melt generated during sintering determine the structure of the bonding phases formed. Melts that do not undergo reshaping and coalescence solidify into porous structures and this could have an adverse effect on sinter properties. The properties of melts, just prior to solidification, are highly dependent on the chemical composition of the adhering fines layer in granules and the assimilation behaviour of the nuclear particles. In this study, a carefully controlled bench-scale furnace was used to manufacture analogue sinters, which were characterized using optical microscopy and image analysis. Results show that altering the lime, and silica content of the adhering fines changed the structure of the analogue sinters formed because this altered the ability of the melt generated from the adhering fines, or primary melt, to react with iron oxide. The properties of the ore nuclear particles-in particular, porosity-have a significant influence on the proportion assimilated during the sintering period. The assimilation mechanism is different for porous ores because primary melts are highly mobile and readily penetrate into pores. Results also indicate that because of differences in assimilation mechanism, there are benefits in increasing the volume of primary melt (i.e. increased level of fines) when sintering blends containing high levels of porous ores. Maximum sintering temperature was also shown to be important because it influences assimilation rate and the viscosity of melts.
机译：烧结过程中产生的熔体性质决定了所形成的键合相的结构。没有进行整形和聚结的熔体会固化成多孔结构，这可能会对烧结性能产生不利影响。刚好在凝固之前，熔体的性质高度取决于颗粒中粘附的细粉层的化学组成以及核粒子的同化行为。在这项研究中，使用精心控制的台式炉来制造模拟烧结矿，并使用光学显微镜和图像分析对其进行表征。结果表明，改变石灰和粘附细粉中的二氧化硅含量会改变所形成的类似烧结矿的结构，因为这会改变粘附细粉产生的熔体（或初熔体）与氧化铁反应的能力。矿核颗粒的性质，特别是孔隙度，对烧结期间被吸收的比例有很大的影响。对于多孔矿石，同化机理不同，因为初熔体的流动性很高，并且易于渗透到孔隙中。结果还表明，由于同化机理的差异，在烧结含高含量多孔矿石的混合物时，增加一次熔体的体积（即增加细粉的含量）是有好处的。最高烧结温度也很重要，因为它会影响同化率和熔体的粘度。

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