How is crude magnesium refined after extraction?

After crude magnesium is extracted, it undergoes a refining process in cast shops to prepare the metal for commercial use. This stage involves several key steps:

• Removal of Impurities: The crude metal is processed to eliminate unwanted substances.1
• Alloying: Specific elements are added to the molten magnesium to create desired alloys.1
• Transformation: The refined metal is cast into usable forms, such as ingots, billets, and slabs.1

During the melting and handling phases, the molten magnesium must be protected from burning. This is achieved by covering the metal with a layer of flux or by using a protective gas, such as sulfur dioxide or sulfur hexafluoride. Additionally, to prevent corrosion during shipping and handling in harsh climates, the final products are typically protected with ventilated plastic or paper wrappings.1