.png){kind=icon}
.png){kind=icon}
Return
Kinetics of Isothermal and Non-Isothermal Pre-Reduction of Chromite with Hydrogen
.png){kind=icon}
OA
AI
M
B
Q
B
D
DOI：10.3390/hydrogen7010021.png)
.png){kind=icon}
.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Production of ferrochrome alloy is carried out using carbon as a reductant in a Submerged Arc Furnace (SAF). Carbothermic reduction of chromite ore results in high CO2 emissions, and alternative reductants such as H2, wherein H2O is the only by-product, have become attractive potential alternatives. Before utilizing H2 as a reductant, it is crucial to carry out a comprehensive study on the reaction kinetics with the view to aid the design and operation of reactors that facilitate the reduction process. The current study determined the kinetic parameters for isothermal and non-isothermal pre-reduction of chromite with H2 in a thermogravimetric furnace. Results from powder X-ray diffraction and scanning electron microscopy determined the mineralogical variations between the feed and the pre-reduced samples, as well as the variation between isothermally and non-isothermally treated samples. The mass loss data indicates that longer reduction times are required to reach complete reduction. The apparent activation energy for the isothermal and non-isothermal pre-reduction tests was found to be 105 and 124 kJ/mol, respectively. The mineralogical observations for pre-reduced samples at 1300 degrees C and 1500 degrees C showed that samples treated at lower temperatures (1300 degrees C) displayed consistent textures and Fe-Cr droplets along rims of partially altered chromite (PAC), which suggested higher metallization at this temperature. Higher temperatures (1500 degrees C), on the other hand, resulted in poor metallization, possibly because higher temperatures are often associated with a collapsed pore network, which results in poor diffusion rates, thus hindering complete reduction.
Keywords:
hydrogen
chromite
pre-reduction
kinetics
PAC
Fe-Cr droplets
AI Summary
Key information extracted from the uploaded paper, including a brief overview, abstract, background, key highlights, visual analysis, and future outlook.
Journal
H
IF:
3
Papers:
97
Citations:
497
Organization
Cited Papers