Production of acid soluble titania
US5411719A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1993 |
| Grant date | May 2, 1995 |
| Priority date | — |
| Expiry date | Sep 24, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B34/1236
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Accordingly the present invention provides a process for producing acid soluble titania which process comprises the steps of: PA1 (i) adding a manganese or magnesium compound to a titaniferous mineral if the mineral does not contain sufficient manganese and magnesium to satisfy the following relationship: ##EQU1## where a represents the percentage by weight of MgO contained in the mineral, PA2 b represents the percentage by weight of MnO contained in the mineral, and PA2 d represents the percentage by weight of TiO.sub.2 contained in the mineral; PA1 (ii) heating the titaniferous mineral in the presence of a reductant at a temperature and for a time sufficient to permit contained iron to be reduced to its metallic form and contained titania to convert to an acid soluble form without significant accretion of the mineral occurring; PA1 (iii) cooling the product of step (ii); and PA1 (iv) subjecting the product of step (iii) to an aqueous chemical treatment to substantially remove iron from the mineral PA1 wherein the manganese or magnesium compound is an oxide or is capable of decomposing to an oxide under reaction conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.