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首页> 外文期刊>ISIJ international >Granulation Behavior of an Iron Ore Sintering Mixture Containing High Grade Pellet Feed with Different Specific Surface
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Granulation Behavior of an Iron Ore Sintering Mixture Containing High Grade Pellet Feed with Different Specific Surface

机译：含有不同比表面的高级颗粒饲料的铁矿石烧结混合物的造粒行为

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High-grade iron ores became more attractive due to the searching for lower slag rate operation in blast furnaces aiming to reduce CO_(2) emissions as the environmental regulation became even more restricted. The granulation behavior of high-grade ores individually and together with other iron ores played an important role for sintering process. In this context, this work aims to evaluate the granulation behavior of a pellet feed with different specific surfaces. To carry out this study, 25% of pellet feed was added to an iron ore mix in a bench scale drum. The Granulation Index (GI) was determined and samples were collected after granulation step for quasi-particles investigation. The results showed that a previous mechanical treatment of the pellet feed by roller press is suitable in order to enable a good granulation behavior of this fine material, which was essential to guarantee its use as raw material in sintering process. The fraction below 0.045 mm of the pressed pellet feed helped to improve the granulation of the natural pellet feed. The thickness of the adherent layer and means size of quasi-particles increased with the specific surface. The GI results increase with the pellet feed specific surface, up to 1400–1500 cm~(2)/g stabilizing around 86–90%. The fines below 0.15 mm that remained agglomerated, after drop test, had similar behavior of GI. Finally, it was possible to obtain a minimum specific surface level (1400–1500 cm~(2)/g) to achieve an optimum performance in the granulation step which may promote a good sintering process permeability conditions.
机译：由于在环境监管变得更加受限制的情况下，高档铁矿石由于搜索较低的炉渣运行而变得更具吸引力。单独和与其他铁矿石单独和一起的高档矿石的造粒行为在烧结过程中发挥着重要作用。在这种情况下，该工作旨在评估用不同特异性表面的颗粒饲料的造粒行为。为了进行这项研究，将25％的颗粒饲料加入到板凳刻度鼓中的铁矿石中。测定造粒指数（GI），并在造粒步骤后收集样品以进行准粒子调查。结果表明，通过辊压机的颗粒饲料的先前机械处理适用于这种细材料的良好造粒行为，这对于保证其在烧结过程中使用原料是必不可少的。低于0.045mm的压制颗粒饲料的级分有助于改善天然颗粒饲料的造粒。粘附层的厚度和拟粒子的尺寸随比表面增加。 GI导致颗粒饲料比表面增加，高达1400-1500cm〜（2）/ g稳定约86-90％。在滴试验后，剩下的凝聚量低于0.15mm以下的含量。最后，可以获得最小的比表面积（1400-1500cm〜（2）/ g），以在造粒步骤中获得最佳性能，这可以促进良好的烧结过程渗透性条件。

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