Determination of the rate equation df carbide formation from reduced iron and formulation of mathematical model for the reaction in fluidized bed

在0.1- 0.6 MPa、0.15- 0.21 mm颗粒中降低了h_2-h_2S混合物中的hematite ore和lomonite ore与α_s =Q.1-0.6和carbupzed在CO-H_2-H_2S混合物中。在研究中，我们用Hematite ore测量了从反应气体中减少的铁在0.1- 0.6兆帕在500-700-C下的0.1- 0.6兆帕中的碳化物形成速率，并将其公式化为碳化物形成速率并确定了稀有参数。（2）我们已经研究了在实验室尺度上流化床中0.1- 0.6 MPa的反应气体在873 K处形成的碳化物，以及（3）我们已经尝试将铁碳化物从帮派材料中磁性地分离出来，直到柠檬矿的块被减少并被碳化到水泥。我们描述了实验结果的结果。（1）我们将碳化物形成率结合在一起，因为接近第一顺序反应的综合率等于-ln（1-f_θ）=g（p_bT）t，就像大气压力的作用一样。 ... More 分析速率g（p_bT）从梯度在-ln（1-f_θ）中获得，g（p_bT）依赖于成分、总压力p_r和温度T。作为一个结果，我们找到了g（PB_T）的值，即在600 ° C时1的功率，在700 ° C时1.4 - 1.5是基于依赖性的，我们将控制速率的步骤包括在600℃的CO的不同吸收步骤，但它的研究转移到不同吸收步骤和CO的混合控制的不同氧化物去除步骤的研究转移。H_2。从基本反应机制中，一个总速率相等被推导出来用于碳化物形成和确定的速率参数，从哪一个对碳化物形成速率的计算被启用在流化床中。对碳化物形成的减量和碳化温度的影响也得到了调查。（2）我们已经测量了从降低的熨斗中流动床中反应气体在压力条件下测量了碳化物形成率。碳形成曲线是从样品的组成中得到的，每600- 900年代通过XRD和碳分析进行的间隔和确定的。此外，对于床来说，曲线几乎观察到了综合的第一顺序反应率相等，g（p_bT）的值在-ln（1-f_θ）中被发现为梯度。我们在600 ° C时找到了g（p_bT）的1个功率。Furthermore，通过分析流化床的出口气体组成，我们确定了对吸附氧的总清除量的相对贡献;通过O（ad）+H_2→H_2O和O（ad）+CO→CO_2。作为一个结果，用于碳化物形成的氧化物的清除主要是基于前反应，而用于自由碳的氧化物的清除主要是基于后期反应。更进一步，我们提出了一种方法，即压力提高碳化物的形成率。我们提出了两个反应模型，I.E.插头流动反应模型和泡沫汇编模型，并指示了模型对碳化物形成曲线的适用性。这些模型可以为流化床中的碳化物形成提供一个尺度。（3） We produced iron carbide by reducing a limonite ore block and carburizing the reduced iron。在脉冲化之后，我们试着用磁性分离方法将铁碳化物从黑帮材料中分离出来。作为一个结果，我们找到了这样的结果，我们就很难分离黑帮材料，其中含有最多8%质量%的黑帮材料，甚至用磁性分离方法从铁碳化物中提取。Less（低）

In pressurized conditions of 0.1-0.6MPa, 0.15-0.21mm particles of a hematite ore and a limonite ore were reduced in H_2-H_2S mixtures with α_s=Q.1-0.6 and carbupzed in CO-H_2-H_2S mixtures. In the study using the hematite ore,(1) we have gravimetrically measured the carbide formation rate from reduced iron in the reaction gas of 0.1-0.6MPa at 500-700ーC, and formulated the rate for the carbide formation and determined the rare parameters.(2) We have studied the carbide formation in a laboratory scale fluidized bed in the reaction gas of 0.1-0.6MPa at 873K by using the hematite ore, and(3) we have tried to magnetically separate the iron carbide from gangue materials after the limonite ore blocks were reduced and carburized to cementite. We describe the results of the experiments blow.(1) We have concluded that the carbide formation rate nearly obeys the integrated rate equation for the first order reaction -ln(1-f_θ)=g(p_bT)t as well as the rate at the atmospheric pressure does it. The c … More arburization rate g(p_bT) obtained from the gradient in -ln(1-f_θ) versus t plot and the dependency of g(p_bT) on the composition, total pressure p_r and temperature T was investigated. As a result, we have found out that the value of g(pb_T) is piortional to the power of 1 at 600℃ and 1.4 to 1.5 at 700℃ to Pr. Based on the dependence, we have concluded that the rate controlling step is the dissociative adsorption step of CO at 600℃ but it gradually shifts to the mixed control of the dissociative adsorption step and the adsorbed oxygen removing step by CO and H_2. From the elementary reaction mechanism, an overall rate equation was derived for the carbide formation and the rate parameters were determined, from which the calculation of the carbide formation rate was enabled with the fluidjzed bed. The influence of reduction and carburization temperature on the carbide formation was also investigated.(2) We have measured the carbide formation rate from reduced iron in a fluidized bed with the reaction gas under the pressurized condition. Carbide formation curves were established from the composition of samples, which were taken every 600-900s interval and determined by XRD and carbon analysis. Also for the bed, the curves nearly obeyed the integrated first order reaction rate equation and the value of g(p_bT) was obtained as the gradients in -ln(1-f_θ) versus t plot. And we found that the g(p_bT) is proportional to the 1 power to p_r at 600℃. Furthermore, by analyzing the composition of the outlet gas from the fluidized bed, we have determined the relative contribution to the total removal of the adsorbed oxygen ; by O(ad)+H_2→H_2O and O(ad)+CO→CO_2. As a result, the oxygen removal for carbide formation is mainly based on the former reaction and the oxygen removal for free carbon is mainly based on the latter reaction. Furthermore, we proved that pressurizing enhances the carbide formation rate. We have proposed two reaction models, I.e. plug flow reaction model and bubble assemblage model and indicated the applicability of the models to the carbide formation curves. These models can contribute thescale up of the carbide formation in fluidized bed.(3) We produced iron carbide by reducing a limonite ore block and carburizing the reduced iron. After pulverization, we tried to separate the iron carbide from gangue materials by magnetic separation method. As a result, we have found out that we can hardly separate the gangue materials, which contains at most 8 mass% gangue materials, from iron carbide even by using magnetic separation method. Less