Process for the manufacture of zirconium oxide hydrate from granular crystallized zirconium oxide

摘要

A process for the preparation of zirconia hydrate from zirconia by reaction of the latter with solid sodium hydroxide at 550 DEG -1,400 DEG 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.