Mechanism of slag pellets sticking on the wall of reduction pot in magnesium production by Pidgeon process

Jilei Xu; Jinhui Liu; Dong Guo; Mao Chen; Peixu Yang; Rongbin Li; Shaojun Zhang

Journal of Magnesium and Alloys (Jun 2024)

Mechanism of slag pellets sticking on the wall of reduction pot in magnesium production by Pidgeon process

Jilei Xu,
Jinhui Liu,
Dong Guo,
Mao Chen,
Peixu Yang,
Rongbin Li,
Shaojun Zhang

Affiliations

Jilei Xu: School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China; Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou 450001, China
Jinhui Liu: School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China; Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou 450001, China; Corresponding author at: School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China.
Dong Guo: School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China; Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou 450001, China
Mao Chen: School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China; Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou 450001, China
Peixu Yang: School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China; Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou 450001, China
Rongbin Li: School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Shaojun Zhang: School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China; Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou 450001, China

Journal volume & issue: Vol. 12, no. 6
pp. 2397 – 2412

Abstract

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In the preparation of magnesium by Pidgeon process, the phenomenon slag pellets sticking on the wall of reduction pot always appear, and the glaze sticking on the inner wall of the reduction pot is difficult to remove. The mechanism of this phenomenon is studied in this work by X-ray fluorescence spectrometer (XRF) measurement, electron probe microanalyzer scanning (EPMA) analysis, differential scanning calorimetry (DSC) analysis, and thermodynamic calculations. The main components of the glaze are MgO, Ca12Al14F2O32, CaF2, CaO, and a small amount of Ca4Si2O7F2. The solid-liquid transition temperature of Ca12Al14F2O32 and CaF2 is close to the production temperature of Pidgeon process, which leads to the bonding between the slag pellets and the pot wall. The loss of CaF2 in glaze layer will reduce the total amount of liquid phase and increase the temperature at which Ca12Al14F2O32 is completely transformed into liquid phase, which causes glaze layer sticking on the inner wall of the reduction pot.

Published in Journal of Magnesium and Alloys

ISSN: 2213-9567 (Online)
Publisher: KeAi Communications Co., Ltd.
Country of publisher: China
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.keaipublishing.com/en/journals/journal-of-magnesium-and-alloys/

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