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Hatari
Zirconium: Oxide Reduced with Calcium and Calcium Chloride in a Sealed Bomb at 950 °C (Kiernan, US 1,760,413)
Pure zirconium nitrate is burnt to oxide, then sealed in a steel bomb with clean calcium chips and calcium chloride and held at 950 °C. Water washes out the calcium chloride and dilute nitric acid the lime, leaving zirconium powder.
Result: dark grey zirconium metal powder, passing 150 mesh.
Source: J. W. Kiernan (Westinghouse), US patent 1,760,413, pp. 2-3. Picture drawn by Youblob.
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