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首页> 外文期刊>ISIJ international >Rate of iron carbide formation from reduced iron in CO-H_2-H_2S mixtures under pressurized conditions
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Rate of iron carbide formation from reduced iron in CO-H_2-H_2S mixtures under pressurized conditions

机译：加压条件下CO-H_2-H_2S混合物中还原铁形成碳化铁的速率

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摘要

Under pressurized conditions up to 0.6MPa, the rate of the iron carbide formation from completely reduced iron in CO-H_2-H_2S mixtures was measured by gravimetric technique. The fractional conversion for carbide formation, f_(theta), was defined as the weight gain divided by the weight of carbon for the complete conversion to cementite. First, the compositions of the partially reacted samples were analyzed by Mossbauer absorption spectroscopy. Then, the fractional conversion calculated from the composition, f_(theta)~M, was compared with f_(theta). The value of f_(theta) agreed reasonably with that of f_(theta)~M in the range f_(theta)<0.8, from which the gravimetric method is proved to be valid to the measurements for the rate of iron carbide formation. The carbide formation curves, f_(theta) versus t relation, were not influenced by the weight of the sample and the flow rate of the reaction gas in the conditions; 50 mg, more than 3.33X10~(-6) m~3/s. Cross sectional view indicated the homogeneous distribution of cementite regions in the reduced iron particles partially converted to cementite. On the other hand, the rate was very sensitive to the conditions of the carburization reaction on the pore surface. The rate increased with increasing the content of carbon monoxide up to 80 to 90 percent, where the rate was the maximum, and then gradually decreased with further increasing the content. The rate increased with the total pressure, but decreased with the activity of sulfur. The rate controlling step of the iron carbide formation was discussed on the basis of the experimental results. The rate controlling step was assumed to be the carburization reactions on the pore surface of reduced iron particles.
机译：在高达0.6MPa的加压条件下，通过重量分析法测量了CO-H_2-H_2S混合物中完全还原铁形成碳化铁的速率。碳化物形成的分数转换f_θ定义为重量增加除以碳完全转化成渗碳体的重量。首先，通过Mossbauer吸收光谱法分析部分反应的样品的组成。然后，将从组成f_θ〜M计算出的分数转换与f_θ进行比较。 f_θ的值与f_θ〜M的值在f_θ＜0.8的范围内合理地吻合，由此证明重量法对于测量碳化铁形成速率是有效的。碳化物的形成曲线f_θ与t的关系，不受样品重量和条件下反应气体流速的影响。 50 mg，大于3.33X10〜（-6）m〜3 / s。横截面图表明部分还原成渗碳体的还原铁颗粒中渗碳体区域的均匀分布。另一方面，该速率对孔表面渗碳反应的条件非常敏感。随着一氧化碳含量的增加（最高）达到80％到90％时，速率增加，然后随着含量的增加逐渐降低。该速率随总压力而增加，但随硫的活性而降低。根据实验结果讨论了碳化铁形成的速率控制步骤。速率控制步骤假定为还原的铁颗粒的孔表面上的渗碳反应。

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