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US4096233A
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Process for the removal of impurities contained in a zinc and cadmium sulfate solution
Assignee: Societe des Mines et Fonderies de Zinc de la Vieille Montagne SA
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Filing: 1976-06-07
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Granted: 1978-06-20
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Expires: 1996-06-07
Abstract
Abstract Process for removing impurities selected from the group consisting of manese, cobalt, nickel and thallium from an acidic zinc or cadmium solution comprising adding thereto acid of Caro or an ammonium or alkali metal salt thereof.
Inventors
- 👤 Fernand Jacques Joseph Bodson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:34
CPC Classifications
C; C01; C01G; C01G9/00; C01G9/06; Y; Y10; Y10S; Y10S204/00; Y10S204/13
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
100 words
A process for the substantial removal of the impurities manganese, cobalt and nickel from a zinc or cadmium sulfate solution which comprises substantially simultaneously precipitating said impurities by adding to said zinc or cadmium sulfate solution a member selected from the group consisting of a solution of H 2 S 2 O 8 , an ammonium or an alkali metal salt thereof, which has been hydrolyzed to provide the maximum content of H 2 SO 5 , the ammonium or an alkali metal salt thereof, while maintaining the pH of said zinc or cadmium sulfate solution between 1.5 and 4.5.
Claim 2
Dependent Claim
100 words
A process for the substantial removal of the impurities manganese, cobalt and nickel from a zinc or cadmium sulfate solution which comprises substantially simultaneously precipitating said impurities by adding to said zinc or cadmium sulfate solution a member selected from the group consisting of a solution of H 2 S 2 O 8 , an ammonium or an alkali metal salt thereof, which has been hydrolyzed to provide the maximum content of H 2 SO 5 , the ammonium or an alkali metal salt thereof, while maintaining the pH of said zinc or cadmium sulfate solution between 1.5 and 4.5.
Claim 3
Dependent Claim
33 words
A process according to claim 1, wherein said impurities further include thallium, which is precipitated along with said manganese, cobalt and nickel while maintaining the pH of the solution between 4 and 4.5.
Claim 4
Dependent Claim
33 words
A process according to claim 1, wherein the solution of H 2 S 2 O 8 is hydrolyzed during a time of between 10 and 14 hours at a temperature of 20° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |