US3811907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing of silicate ores and product thereof
Assignee: X-TECH Corp A CORP OF
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Filing: 1973-03-12
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Granted: 1974-05-21
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Expires: 1993-03-12
Abstract
Abstract Separating silica from a metal silicate ore such as zircon by heating particles of the ore above the dissociation temperature of the ore without coalescence of the particles, and quenching the heated particles immediately so that the particle temperature decreases from above to below the dissociation temperature in less than 0.1 seconds. Dissociated zircon particles produced by this process have extremely small zirconia crystallites having dimensions less than about 0.2 microns in fused amorphous silica. Zirconia is produced from these dissociated zircon particles by leaching in an aqueous alkali medium.
Inventors
- 👤 L Scammon
- 👤 C Grant
- 👤 P Wilks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:59
CPC Classifications
C; C09; C09C; C09C1/00; C01; C01B; C01B33/00; C01B33/20; C01B33/32; C01G; C01G25/00; C01G25/02; C01P; C01P2002/00; C01P2002/02; C01P2002/60; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/50; C01P2004/60; C01P2004/62; C01P2004/80; C01P2004/82; C01P2006/00; C01P2006/10; C01P2006/80
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
22 words
Dissociated zircon according to claim 1 wherein at least about 95 percent of said crystallites have maximum dimensions of about 0.2 microns
Claim 2
Dependent Claim
15 words
Dissociated zircon according to claim 1 in the form of particles of generally spheroidal shape.
Claim 3
Dependent Claim
40 words
Friable, porous particles formed of a plurality of zirconia crystallites of which at least about 95 percent have maximum dimensions of about 0.2 microns bonded together by fused amorphous silica, said particles containing less than 10 percent by weight silica.
Claim 4
Dependent Claim
12 words
Friable particles according to claim 4 containing less than 1 percent silica.
Claim 5
Dependent Claim
12 words
Friable particles according to claim 5 containing less than 0.5 percent silica.
Claim 6
Dependent Claim
14 words
Friable particles according to claim 4 having a density of less than 3 gms/cc.
Claim 7
Dependent Claim
23 words
Zirconia in the form of monoclinic crystallites cOntaining less than 1 percent by weight silica and having a maximum dimension of 0.2 microns.
Claim 8
Dependent Claim
16 words
Zirconia according to claim 8 wherein said crystallites contain less than 0.5 percent by weight silica.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |