Process for the production of high-grade titanium dioxide by sulfate method
US4986742A · kind A · utility
11Cited by
3References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 17, 1989 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | Aug 17, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P10/20
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
High-grade titanium dioxide is produced by PA0 (a) reacting ilmenite or titanium-containing slag with sulfuric acid, PA0 (b) dissolving the material from (a) with water or dilute sulfuric acid, PA0 (c) separating insolubles from (b) to obtain a black solution containing titanyl sulfate and foreign metal salts, PA0 extracting titanyl sulfate from the black liquor with sulfuric acid and an organic medium containing an organophosphorus compound, separating the foreign metal salts in an aqueous extract phase, recovering titanyl sulfate from the organic extract phase, and PA0 hydrolyzing the titanyl sulfate to titanium oxide hydrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.