为探究膨化淀粉在球团矿内部的作用行为,以铁精矿和膨化淀粉为原料进行实验室球团焙烧试验,通过红外光谱、TG分析、扫描电镜和XRD等分析方法,对膨化淀粉物料特性及膨化淀粉对球团内部作用行为进行了研究.研究结果表明,膨化淀粉比普通淀粉含有更多的极性基团,极性基团相互之间、基团与铁矿表面离子之间的作用,可以提高铁矿粒间的黏结性和生球强度,当膨化淀粉质量分数为2%时,生球的落下强度为11.2次/0.5 m,抗压强度达到17.5 N/个;膨化淀粉球团在焙烧过程中,膨化淀粉与氧气反应产生的气体从球团内部逸出,增加了球团内部气孔率,促进了Fe3O4的氧化,提高了球团矿含铁品位.
In order to investigate the action and behavior of gelatinized starch in iron pellets,the baking trials of pellets were conducted based on the gelatinized starch and magnetite concentrate. The characteristics of the gelatinized starch and the effect of the gelatinized starch on the inner structure of pellets materials were investigated using the approaches of FT-IR,TG,SEM and XRD. The results showed that the gelatinized starch had much more polar group than that of or-dinary starch,which could help to improve the strength of pellets and the adhesion of iron ore due to the mutual actions of polar groups and ions of iron ore surfaces. When the mass percent of the gelatinized starch into the pellets is 2%,the drop strength of raw pellets was 11.2/0.5 m,and the compressive strength reached 17.5 N/one pellet. The gas produced by the reaction of the gelatinized starch and oxygen escaped from the inner structure during the baking,which was bene-ficial to increase the gas-pore amount within pellets and further facilitate the oxidation of Fe3O4,hence,the iron grade of pellets was improved.
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