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How is pure calcium metal made commercially?

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A labeled diagram of the periodic table entry for calcium, showing its atomic number 20, symbol Ca, atomic weight 40.078, electron configuration, and classification as an alkaline-earth metal. Icons indicate calcium is a solid with a face-centered cubic crystal structure and strongly basic oxides at room temperature. — calcium The chemical element calcium is the most abundant metallic element in the human body.

Pure calcium metal is produced commercially by heating lime (calcium oxide) with aluminum. This method replaced the earlier process of producing the metal through the electrolysis of anhydrous calcium chloride.1