Metals Production and Metal Oxides Reduction Using Hydrogen: A Review

The gas-based direct reduction of iron ore pellets was carried out by simulating the typical gas composition in coal gasification process, Midrex and Hyl-III processes. The influences of gas composition and temperature on reduction were studied. Results show that the increasing of H2 proportion is helpful to improve the reduction rate. However, when φ(H2):φ(CO)>1.6:1, changes of H2 content have little influence on it. Appropriate reduction temperature is about 950 °C, and higher temperature (1 000 °C) may unfavorably slow the reduction rate. From the kinetics analysis at 950 °C, the most part of reduction course is likely controlled by interfacial chemical reaction mechanism and in the final stage controlled by a combined effect of gaseous diffusion and interfacial chemical reaction mechanisms. From the utilizations study of different reducing gases at 950 °C, the key step in reduction course is the 3rd stage (FeO→Fe), and the utilization of reducing gas increases with the rise of H2 proportion.

Action rules of H2 and CO in gas-based direct reduction of iron ore pellets

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A non-isothermal mathematical model has been developed for study of the reduction process of ferrous oxide with gases The model includes heterogeneous chemical kinetic expressions and equations of heat and mass transfer The numerical scheme based on the finite volume method in an implicit formulation is used for solving the differential equations The model has been validated with experimental results from the literature The numerical results indicated reaction enthalpy was influenced transiently by temperature The gas concentration profile inside ferrous oxide particle developing with an elapse of time can also be simulated by the model

Non-isothermal kinetic model for reduction of ferrous oxide with hydrogen and carbon monoxide

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Non-isothermal kinetic model for reduction of ferrous oxide with hydrogen and carbon monoxide