Effect of Halide Flux on Physicochemical Properties of MgCl2-Based Molten Salts for Accelerating Zirconium Production: Thermodynamic Assessment

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• 作者：Jae Hong Shin ; Joo Hyun Park
• 刊名：Metallurgical and Materials Transactions E
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：3
• 期：3
• 页码：218-226
• 全文大小：2,449 KB
• 刊物类别：Metallic Materials; Characterization and Evaluation of Materials; Structural Materials; Surfaces and
• 刊物主题：Metallic Materials; Characterization and Evaluation of Materials; Structural Materials; Surfaces and Interfaces, Thin Films; Nanotechnology; Energy, general;
• 出版者：Springer US
• ISSN：2196-2944
• 卷排序：3

文摘

The effective halide flux additive for increasing the density of MgCl₂ mixture and for decreasing the activity of MgCl₂ was investigated in order to improve the reaction efficiency between gaseous ZrCl₄ and fresh Mg melt to produce zirconium sponge. Thermochemical computation using FactSageTM software was primarily carried out, followed by the experimental confirmation. The addition of CaCl₂, BaCl₂, MgF₂, and CaF₂ to the molten MgCl₂ increases the density of the melts, indicating that these halide additives can be a candidate to increase the density of the MgCl₂-based molten salts. Among them, BaCl₂, MgF₂, and CaF₂ are the useful additives. The activity of MgCl₂ can be reduced by the addition of BaCl₂, KCl, NaCl, MgF₂, and CaF₂, among which the CaF₂ is the most effective additive to reduce the activity of MgCl₂ with the strongest negative deviation from an ideality. Thus, the addition of CaF₂ to the MgCl₂, forming the MgCl₂-CaF₂ binary melt, is the most effective way not only to increase the density of the melt but also to decrease the activity of MgCl₂, which was experimentally confirmed. Consequently, the production rate of zirconium sponge by magnesiothermic reduction process can be accelerated by the addition of CaF₂.Manuscript submitted March 1, 2016.