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首页> 外文期刊>ISIJ international >Rate of Direct Reactions Measured in Vacuum of Iron Ore-Carbon Composite Pellets Heated at High Temperatures: Influence of Carbonaceous Materials, Oxidation Degree of Iron Oxides and Temperature
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Rate of Direct Reactions Measured in Vacuum of Iron Ore-Carbon Composite Pellets Heated at High Temperatures: Influence of Carbonaceous Materials, Oxidation Degree of Iron Oxides and Temperature

机译：在高温下加热的铁矿石-碳复合颗粒的真空中直接测量的速率：碳质材料，氧化铁的氧化程度和温度的影响

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The nine kinds of the composite pellets of 3.5 to 5.5 mm in diameter composed of the mixtures of wustite, magnetite or hematite and coal char, coke or graphite, in which the mol of the reducible oxygen was made equal to the mol of the fixed carbon, was heated in vacuum. The weight loss during heated at 1 000 to 1 200 deg C was gravimetrically measured. The influence of the diameter was negligible within 5.0 mm. The temperature dependence of the rate of the direct reactions of all the composite pellets was very strong. At 1 000 deg C, the rate was such slow that it requires more than 2 ks to reach F_t=0.2 and, at 1 200 deg C, the rate was so fast that it is completed in a few hundreds seconds. The direct reactions of the char or coke bearing composite pellets proceed in two steps; the first step is very fast and temperature-independent, and the second step is the temperature-dependent process. On the contrary, the direct reactions of the graphite bearing composite pellets proceeds in three steps at 1100 and 1150 deg C; the first step is also very fast and temperature independent, and the much slower second step follows until metallic iron is formed. Just after the metallic iron starts to form, the reactions are accelerated as the third step. This third step of the graphite composite pellets is much faster than the second step of the char or coke bearing composite pellets. The maximum pressure inside the pellets simulated by the uniform reaction model indicates the negligible effect of the indirect reactions.
机译：直径为3.5至5.5毫米的9种复合球团，由铁矾，磁铁矿或赤铁矿与煤焦，焦炭或石墨的混合物组成，其中可还原氧的摩尔数等于固定碳的摩尔数在真空中加热。用重量分析法测量在1000至1200℃下加热期间的重量损失。直径的影响在5.0毫米以内可以忽略不计。所有复合颗粒的直接反应速率的温度依赖性非常强。在1 000摄氏度时，速率如此之慢，以至于需要超过2 ks才能达到F_t = 0.2；在1200摄氏度时，速率如此之快，以至于在数百秒内完成。带有炭或焦炭的复合颗粒的直接反应分两个步骤进行：第一步非常快速且与温度无关，第二步是与温度有关的过程。相反，含石墨的复合颗粒的直接反应在1100和1150摄氏度下分三步进行。第一步也非常快且不受温度影响，随后的第二步要慢得多，直到形成金属铁为止。在金属铁开始形成之后，作为第三步加速反应。石墨复合颗粒的第三步比炭或焦炭复合颗粒的第二步快得多。均匀反应模型模拟的颗粒内部最大压力表明间接反应的影响可忽略不计。

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