A Study on the Reduction Behavior of FeO by Analyzing Pore Characteristics Using the Labyrinth Coefficient at High Temperature

The plasma electrolytic method of oxidation (PEO) is a technique that is increasingly being used in industry to produce protective coatings and other surface treatments. The emphasis is then placed on the dielectric breakdown that repeatedly occurs across the surface of the workpiece. There is significant potential for more effective process control. Key study areas include the interrelation of electrical conditions, electrolyte composition, coating microstructure, and growth rates. With specific goals in terms of coating performance and energy efficiency, an attempt is made to identify key points that are likely to simplify this. The research aims to identify the optimized range of input parameters when the oxide layer is formed using the DC supply in the silicate-based electrolyte on Al 6061 substrate. For developing an oxide layer on Al 6061, a silicate-based electrolyte containing Na2SiO3 (10g/L), KOH (2g/L), and KMnO4 3 (g/lit) is applied. At the optimal parameter of DC supply with 190 V and 1.5 A, the maximal adoption of Mn particles was observed to be 34 percent.

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The effects of processing parameters on the formation of oxide layers in aluminium alloys using plasma electrolytic oxidation technique

Jadhav

Bongale

Kumar

2021

Journal of the Mechanical Behavior of Materials

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Modeling Isothermal Reduction of Iron Ore Pellet Using Finite Element Analysis Method: Experiments & Validation

Meshram

Govro

O’Malley

et al. 2022

Metals

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Iron ore pellet reduction experiments were performed with pure hydrogen (H2) and mixtures with carbon monoxide (CO) at different ratios. For direct reduction processes that switch dynamically between reformed natural gas and hydrogen as the reductant, it is important to understand the effects of the transition on the oxide reduction kinetics to optimize the residence time of iron ore pellets in a shaft reactor. Hence, the reduction rates were studied by varying experimental parameters such as the temperature (800, 850 & 900 °C), reactant gas flow rate (100, 150 & 200 cm3/min), pellet size and composition of the reactant gas mixture. The rate of reduction was observed to increase with an increase in temperature and reactant gas flow rate, but it decreased with an increase in pellet size. SEM greyscale analysis was performed to analyze the porosity and phase composition of partially reduced pellets. The porosity of the pellets was observed to increase from 0.3 for unreacted pellet to 0.42 for a completely reduced pellet. Energy-dispersive X-ray spectroscopy (EDAX) analysis was performed to identify the phases observed in the SEM images. The fraction of iron phase was observed to increase from the shell region of the pellet to the core region with an increase in the degree of reduction. A 2D-axisymmetric numerical model was developed on COMSOL Multiphysics, and it was validated using the conversion (X) vs. time curves obtained from each experiment. The model was able to accurately predict the total time needed for the complete conversion of a single iron ore pellet for multiple experiments. Effects of changes in the porosity and tortuosity of the pellet on the model were also studied and the rate of reduction was observed to be sensitive to changes in both porosity and tortuosity. The SEM analysis and the model results show that tortuosity is higher for pellets reduced with H2 than for pellets reduced with H2-CO gas mixtures.

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A Study on the Reduction Behavior of FeO by Analyzing Pore Characteristics Using the Labyrinth Coefficient at High Temperature

Cited by 2 publications

References 27 publications

The effects of processing parameters on the formation of oxide layers in aluminium alloys using plasma electrolytic oxidation technique

The effects of processing parameters on the formation of oxide layers in aluminium alloys using plasma electrolytic oxidation technique

Modeling Isothermal Reduction of Iron Ore Pellet Using Finite Element Analysis Method: Experiments & Validation

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