Question:
Method used for refining of Zr
Answer:
- The sand and gravel that contain zircon mixed with silicate, ilmenite, and rutile are typically collected from coastal waters by a floating dredge. The ilmenite and rutile are then removed by magnetic and electrostatic separators.
- Zircon further refine into pure zirconium by using a reducing agent (chlorine) to purify the metal and then heating it until it becomes sufficiently ductile, used for industrial purposes.
- The less pure zircon is made into zirconia, an oxide of zirconium, by fusing the zircon with coke, iron borings, and lime until the silica is reduced to silicon that alloys with the iron. The zirconia is then stabilized by heating it to 1,700° C with lime and magnesia.
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