Abstract

Ultra-high-purity magnesium has gained importance in the electronics and biomedical technological fields positioning it as one of the most valuable pure metals in the market. Due to its high reactivity and unique physical properties, vacuum distillation is the process of choice for its purification. Recently, liquid condensation techniques have improved the product collection and processing, however, the high costs associated with this technology and the removal of impurities with a similar vapor pressure to magnesium, such as zinc, remain a challenge. The feasibility of employing the cooled finger, a fractional crystallization method for the purification of magnesium, is analyzed after its successful implementation on other metals such as germanium and aluminum. The distribution coefficient of the most common impurities in Mg is calculated using FactSage, as a measure of the maximum purification that can be achieved through fractional crystallization. Two series of experiments explore the overall purification of magnesium and its relationship with the cooled finger parameters. In the second experimental series, the individual purification of Al, Ca, Mn, and Zn as four of the most predominant impurities in magnesium are further investigated and compared to previously published results from vacuum distillation. The main challenges of fractional crystallization regarding the enrichment of Ti, Zr, and Mn remain as part of the on-going research.

Graphical Abstract

中文翻译：

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采用冷却指状结晶法提纯镁的可行性

摘要

超高纯镁在电子和生物医学技术领域的重要性日益凸显，将其定位为市场上最有价值的纯金属之一。由于其高反应性和独特的物理性质，真空蒸馏是其纯化的首选工艺。最近，液体冷凝技术改进了产品的收集和处理，然而，与该技术相关的高成本以及以与镁相似的蒸气压去除杂质，例如锌，仍然是一个挑战。在成功应用于锗和铝等其他金属后，分析了采用分步结晶法提纯镁的可行性。Mg 中最常见杂质的分布系数通过以下公式计算：FactSage，作为可通过分级结晶实现的最大纯化的量度。两个系列的实验探讨了镁的整体净化及其与冷却指参数的关系。在第二个实验系列中，进一步研究了铝、钙、锰和锌作为镁中最主要的四种杂质的单独纯化，并与之前公布的真空蒸馏结果进行了比较。关于富集 Ti、Zr 和 Mn 的分级结晶的主要挑战仍然是正在进行的研究的一部分。

图形概要