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| Analysis of the reactivity of Al-Si-Fe alloy in the pidgeon process for magnesium production |
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Received:October 12, 2024
Revised:December 04, 2024
Accepted:December 05, 2024
Published Online:August 05, 2025
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| DOI： |
| KeyWord:aluminum silicon iron alloys; calcined dolomite; dolomite; Pidgeon process; activity |
| Author | Institution |
| MA Hongzhou |
School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an |
| GUAN Minghua |
School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an |
| WANG Yaoning |
School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an |
| WANG Jing |
Ha Mi Sheng Mei Magnesium Metal Co,Ltd,Hami |
| DANG Yubo |
School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an |
| ZHANG Xing |
School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an |
| ZENG Jinyang |
School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an |
| WANG Shuaimin |
School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an |
| LIU Gufeng |
Ha Mi Sheng Mei Magnesium Metal Co,Ltd,Hami |
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| Abstract: |
| The Pidgeon process is a major magnesium production method in China. Aluminum-silicon-iron alloys serve as reducing agents for magnesium oxide in calcined dolomite, which can lower the reduction temperature of magnesium. This study investigates the phase transformations and theoretical calculations of the activities of aluminum and silicon during heating for four different aluminum contents in aluminum-silicon-iron alloys. The theoretical analysis indicates that the aluminum content significantly affects the phase composition of the alloy. At aluminum contents of 8% and 12.5%, aluminum primarily exists as Al3Fe in the solid aluminum-silicon-iron alloy. At 25% aluminum content, a small amount of β-AlFeSi is present, and at 37.5%, the alloy contains more β-AlFeSi with a minimal amount of aluminum phase. The temperature at which a liquid phase appears during heating is significantly related to the aluminum content. The activity of aluminum in the alloy is influenced by both aluminum content and temperature, with higher aluminum content resulting in a higher maximum activity of aluminum compared to alloys with lower aluminum content. Additionally, as temperature increases, the activity variation of aluminum in alloys with different aluminum contents differs significantly, with the calculated starting reaction temperature for the reduction of MgO by aluminum being higher than that of silicon. |
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