AbstractZirconia produced by acid‐leaching zircon sand can be significantly contaminated by other elements leached from the sand. A simple cationexchange procedure has been developed that allows separation of the impurity elements from the zirconium to give zirconia with up to 99.99 purity. The addition of formic acid to the acid‐leach solution prior to ion exchange provides the removal of about three‐quarters of the hafnium present in the product zir
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