US3832441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing zirconium oxide and salts
Assignee: Individual
•
Filing: 1973-07-16
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Granted: 1974-08-27
•
Expires: 1993-07-16
Abstract
Abstract A process for the production of calcium zirconate and zirconium oxide or salts therefrom which is characterized by reacting the mineral zircon with limestone to form calcium zirconate and tricalcium silicate. The calcium zirconate is freed from the tricalcium silicate by simple thermal steps which transform the tricalcium silicate to a form which can be separated by physical means. After light milling, the calcium zirconate can be recovered from the gangue material by mineral dressing techniques. The relatively pure form of zirconate can then be treated with acids to form zirconium sulphate which in turn is treated with well-known reagents to form zirconium oxide or other zirconium compounds.
Inventors
- 👤 R Schoenlaub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:41
CPC Classifications
C; C01; C01G; C01G25/00; C01G25/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
35 words
The process as defined in claim 1 wherein the calcium zirconate is separated from the gamma dicalcium silicate by either air and/or water classification after light milling of the clinker cooled below approximately 725* C.
Claim 2
Dependent Claim
34 words
The process as defined in claim 2 wherein the calcium zirconate recovered from the classification step is reacted with sulfuric acid to form soluble zirconium sulfate and insoluble forms of lime and residual silicates.
Claim 3
Dependent Claim
51 words
The process as defined in claim 1 wherein a fluxing agent is added to the zircon and limestone prior to the initial firing step, said fluxing agent being one taken from a group comprising iron oxide and aluminum oxide, and accordingly increasing the amount of limestone added to the initial mixture.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |