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首页> 外文期刊>ISIJ international >Effects of Slag Content and Composition on the Reducibility of Iron Oxide Including CaO-SiO_2-Fe_tO Slag
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Effects of Slag Content and Composition on the Reducibility of Iron Oxide Including CaO-SiO_2-Fe_tO Slag

机译：炉渣含量和组成对CaO-SiO_2-Fe_tO炉渣等铁氧化物还原性的影响

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摘要

In the sintering with lower slag ratio, the melt quantity decreases, and the agglomeration do not progress sufficiently. It is necessary to secure the melt quantity by silicate melt mainly composed of Fe_xO-SiO_2 system and to control ideally the composition and the generation place of the melt. In the present study, iron ore sinter is simulated by an iron oxide pellet added with (CaO-)SiO_2-Fe_tO slag particles, and the effects of the slag content, the composition, the holding time at 1573 K and the slag particle size on the hydrogen reduction behavior of the iron oxide pellet including (CaO-)SiO_2-Fe_tO slag particles have been investigated at 1173 K. In the initial stage of reduction, the fractional reduction is higher when the slag content is higher. With proceeding the reduction, the fractional reduction of the sample with the higher slag content becomes lower than the sample with the lower slag content. The reduction rate decreases with the increase of the slag content. The ratio of the pore area with over 100 μm pore size increases with the increase of slag content. On the other hand, the final fractional reduction decreases with the increase of the slag content. From this fact, it is considered that the increase of macro pore over 100 μm does not affect on the improvement of reducibility, and the microporosity under 100 μm may become an influential factor. On the slag composition, the final fractional reduction of the pellet including Fe_tO-SiO_2 slag is better. This is because that the silicate slag is difficult to permeate nor block up the pore.
机译：在低炉渣比的烧结中，熔体量减少，并且结块不能充分进行。必须通过主要由Fe_xO-SiO_2体系组成的硅酸盐熔体来确保熔体的量，并且理想地控制熔体的组成和产生位置。在本研究中，通过添加（CaO-）SiO_2-Fe_tO炉渣颗粒的氧化铁球团模拟铁矿烧结矿，以及炉渣含量，组成，在1573 K的保持时间和炉渣粒径对炉渣的影响。在1173 K下研究了含（CaO-）SiO_2-Fe_tO炉渣颗粒的氧化铁球团的氢还原行为。在还原的初期，炉渣含量越高，分数还原率越高。随着还原的进行，炉渣含量较高的样品的分数还原变得比炉渣含量较低的样品的降低率更低。还原率随炉渣含量的增加而降低。孔径大于100μm的孔面积的比例随着炉渣含量的增加而增加。另一方面，最终的分数降低随着炉渣含量的增加而降低。从这个事实，认为大于100μm的大孔的增加不影响还原性的提高，并且小于100μm的微孔率可能成为影响因素。在炉渣组成上，包括Fe_tO-SiO_2炉渣的球团的最终分级还原效果更好。这是因为硅酸盐炉渣难以渗透或堵塞孔。

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