Process for the manufacture of zirconium oxide hydrate from granular crystallized zirconium oxide
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United States of America Patent
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Mar 26, 1991
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N/A
app pub date -
Mar 17, 1989
filing date -
Mar 22, 1988
priority date (Note) -
Expired
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Abstract
A process for the preparation of zirconia hydrate from zirconia by reaction of the latter with solid sodium hydroxide at 550.degree.-1,400.degree. C. to form Na zirconate; hydrolysis of the latter to form a suspension of zirconia hydrate in aqueous sodium hydroxide; separation of most of the aqueous sodium hydroxide; treatment of the zirconia hydrate containing residual aqueous sodium hydroxide with an ammonium salt; and separation, washing and dewatering of the purified zirconia hydrate obtained. The zirconia hydrate can be used for the preparation of zirconium compounds.
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