Continuous non-polluting liquid phase titanium dioxide process and apparatus
US6048505A · kind A · utility
9Cited by
12References
20Claims
0Family size
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Key dates
| Filing date | Aug 22, 1997 |
| Grant date | Apr 11, 2000 |
| Priority date | — |
| Expiry date | Aug 22, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B34/1236
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A non-polluting liquid-phase process and a supporting system of apparatus for producing titanium dioxide from titanium ore or slag provide a more economical sulfate process for preparing anatase. The ore or slag is reacted with hot sulfuric acid. The reaction product is filtered and washed before being combined with acid water, in which the solids are partially dissolved. The resulting suspension is filtered, and the filtrate hydrolyzed to convert titanium values therein to titanium dioxide hydrate, which is calcined to produce anatase pigment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.