Abstract: Pseudo solid-solid reactions, which proceed through gaseous intermediates are of considerable importance in metallurgy, such as the reduction of metal oxides with carbon and the segregation roasting of oxidic copper or nickel ores. A model for paired processes has been derived for describing in detail the reduction of ferrous oxide with carbon in various rate-controlling regimes. This model is characterized by two parameters, k1 and k2, which include the intrinsic chemical reaction rate constants, k1 and k2, the diffusion coefficient DAc1, and the mass transfer coefficients, hAm1 and hcm2: Analytic solutions have been obtained for eight extreme cases, and a series of numerical solutions obtained with the aid of an electronic computer are presented. A calculated example based on experimental data is included at the end of the paper.

摘要： 本文对冶金工业中重要反应—固碳还原铁氧化物假固-固反应,建立了一种双过程模型,并由此得出了八种极限情况下的解析解及五种双过程控制下的数值解.由实验数据进行的计算,证明用此模型来判断过程的控制步骤是可行的.