Flow and Phase Change Characteristics of Magnesium Vapor in Vertical Retort During Silicothermic Process

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Flow and Phase Change Characteristics of Magnesium Vapor in Vertical Retort During Silicothermic Process

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[1]CHEN Mao,ZHANG Shaojun,LI Rongbin,et al.Flow and Phase Change Characteristics of Magnesium Vapor in Vertical Retort During Silicothermic Process[J].Journal of Zhengzhou University (Engineering Science),2023,44(04):88-93.[doi:10.13705/j.issn.1671-6833.2023.01.014]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 44卷 Number of periods: 2023 04 Page number: 88-93 Column: Public date: 2023-06-01

Title:: Flow and Phase Change Characteristics of Magnesium Vapor in Vertical Retort During Silicothermic Process

Author(s):: CHEN Mao; ZHANG Shaojun; LI Rongbin; NAN Junjie; LIU Jinhui; YANG Peixu; School of Materials Science and Engineering, Zhengzhou University, 450001, Zhengzhou, Henan, School of Metallurgy and Ecological Engineering, Beijing University of Science and Technology, Beijing 100083

Keywords:: magnesium smelting; magnesium vapor; vertical retort; silicothermic process; flow resistance

CLC:: TF822

DOI:: 10.13705/j.issn.1671-6833.2023.01.014

Abstract:: In the Pidgeon magnesium smelting process, mastering the laws of magnesium vapor flow and crystallization is the key to obtaining high-quality crystalline magnesium. In this paper, the flow characteristic of magnesium vapor in the compound vertical retort from the reduction reaction zone to the crystallization zone was studied. The calculation method of flow resistance was given by introducing the concept of conductance in hightemperature rarefied gas. The relationship between flow resistance and the retort inner diameter, retort size, vapor pressure was deduced. It is shown that the crystallization process of magnesium vapor is not only affected by temperature and pressure, but also related to the diameter of the crystallizer. Appropriately reducing the inner diameter of the crystallizer can obtain crystalline magnesium with higher density. The total pressure loss of magnesium vapor in the compound vertical retort from the reaction zone to crystallization zone is about 150 Pa, and the average working pressure in the reaction zone is higher than two order of magnitude. In the early stage of magnesium smelting, when the temperature of part of the pellets is lower than 600 ℃ , the magnesium vapor moves in the reaction zone in a “condensation-sublimation” manner. As the temperature of the overall pellet rises above 600 ℃ , the flow resistance of magnesium vapor decreases, and it can smoothly enter the crystallizer for crystallization

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Last Update: 2023-07-01