Process for the manufacture of zirconium oxide hydrate from granular crystallized zirconium oxide
US5002749A · kind A · utility
6Cited by
3References
10Claims
0Family size
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Key dates
| Filing date | Mar 17, 1989 |
| Grant date | Mar 26, 1991 |
| Priority date | — |
| Expiry date | Mar 17, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/82
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.