US3660078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of titanium dioxide concentrates
Assignee: Ishihara Sangyo Kaisha Ltd
•
Filing: 1970-02-09
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Granted: 1972-05-02
•
Expires: 1990-02-09
Abstract
Abstract A process for the production of a titanium dioxide concentrate highly enriched with titanium dioxide and having low contents of other components comprising leaching a titaniferous material with a mineral acid in the presence of a seed material capable of accelerating the hydrolysis of titanium salts.
Inventors
- 👤 Shigeki Yamada
- 👤 Kokichi Miyazawa
- 👤 Hideaki Naka
- 👤 Yoshio Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:00
CPC Classifications
C; C01; C01G; C01G23/00; C01G23/04; C01G23/047; C01G23/053; C01G23/0536; C01G23/0538; C01G23/0532; C01G23/0534; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1236; C22B34/124; C01P; C01P2004/00; C01P2004/60; C01P2004/61
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
21 words
The process of claim 1 wherein said material which is ordinarily used as a seed is a colloidal hydrated metal oxide.
Claim 2
Dependent Claim
58 words
The process of claim 2 wherein said material which is ordinarily used as a seed is present in the leaching system so that the molar percentage of the metal oxide in said material which is ordinarily used as a seed is present in an amount of 0.1-10 percent as compared with the titanium dioxide in said titaniferous material.
Claim 3
Dependent Claim
21 words
The process of claim 1 wherein said material which is ordinarily used as a seed is a colloidal hydrated titanium oxide.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein said material which is ordinarily used as a seed is a colloidal hydrated niobium oxide.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein said material which is ordinarily used as a seed is a colloidal hydrated tantalum oxide.
Claim 6
Dependent Claim
21 words
The process of claim 1 wherein said material which is ordinarily used as a seed is a colloidal hydrated tin oxide.
Claim 7
Dependent Claim
14 words
The process of claim 1 wherein said titaniferous material is a titaniferous iron ore.
Claim 8
Dependent Claim
19 words
The process of claim 8 wherein said titaniferous iron ore is an ore occuring in a beach sand-type deposit.
Claim 9
Dependent Claim
22 words
The process of claim 8 wherein said titaniferous iron ore is one having a particle size range of 20-200 Tyler standard mesh.
Claim 10
Dependent Claim
20 words
The process of claim 8 wherein the particles of said titaniferous iron ore are smaller than 200 Tyler standard mesh.
Claim 11
Dependent Claim
12 words
The process of claim 1 wherein said mineral acid is hydrochloric acid.
Claim 12
Dependent Claim
17 words
The process of claim 12 wherein said hydrochloric acid is employed at a concentration of 100-300 g./liter.
Claim 13
Dependent Claim
12 words
The process of claim 1 wherein said mineral acid is sulfuric acid.
Claim 14
Dependent Claim
17 words
The process of claim 14 wherein said sulfuric acid is employed in a concentration of 100-600 g./liter.
Claim 15
Dependent Claim
37 words
The process of claim 1 wherein said titaniferous material is prepared by reducing a titaniferous iron ore containing ferric iRon such that substantially all of the ferric iron contained in such ore is converted into ferrous iron.
Claim 16
Dependent Claim
28 words
The process of claim 1 wherein said titaniferous material is prepared by the removal of a portion of the iron from a titaniferous iron ore by mineral acid-leaching.
Claim 17
Dependent Claim
18 words
The process of claim 1 wherein the leaching is additionally carried out in the presence of fluorine ions.
Claim 18
Dependent Claim
19 words
The process of claim 1 wherein the leaching is additionally carried out in the presence of a reducing agent.
References Cited (Backward Citations)
US1891911A
Cited
US1758472A
Cited
US2127247A
Cited
US2301412A
Cited
US2480869A
Cited
US2622013A
Cited
US3464791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |