Kinetics of extracting magnesium from prefabricated pellets by silicothermic process under flowing argon atmosphere

The Pidgeon process is the main extraction method of magnesium, but its continuous production cannot be achieved due to the switch between vacuum and atmospheric pressure. Therefore, it is vital to realize continuous extraction of magnesium under atmospheric pressure. In this paper, the process of e...

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Bibliographic Details
Published in:Journal of mining and metallurgy. Section B, Metallurgy Metallurgy, 2020, Vol.56 (3), p.379-386
Main Authors: Guo, J.-H., Fu, D.-X., Han, J.-B., Ji, Z.-H., Dou, Z.-H., Zhang, T.-A.
Format: Article
Language:English
Subjects:
Argon
Atmospheric pressure
Briquetting
Carrier gases
Continuous production
Diffusion
Ferrosilicon
Ferrosilicon process
Flow velocity
flowing argon
Fluorides
Gas flow
High temperature
isothermal kinetics
Kinetics
Magnesium
Metallurgy
Pellets
prefabricated pellet
Prefabrication
Reduction
Silicon
silicothermic process
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Summary:The Pidgeon process is the main extraction method of magnesium, but its continuous production cannot be achieved due to the switch between vacuum and atmospheric pressure. Therefore, it is vital to realize continuous extraction of magnesium under atmospheric pressure. In this paper, the process of extracting magnesium from prefabricated pellets in flowing argon was proposed. The isothermal kinetic analysis of the reduction process was carried out. The results showed that the reduction process was controlled by diffusion process in 1 h, and the apparent activation energy of extracting magnesium from prefabricated pellets in flowing argon was 218.75 kJ/mol. Then the influence of experimental factors on the reduction rate was explored, including briquetting pressure, carrier gas flow rate, ferrosilicon content, reaction temperature and time. Through analysis and calculation, it was concluded that the main control step of diffusion process was silicon diffusion.
ISSN:1450-5339
2217-7175
DOI:10.2298/JMMB200712031G