Patent US3855088A successfully refreshed from Google Patents.
US3855088A
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US
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Process for removing cluster adhering to cathode during electrolysis of manganous sulfate
Assignee: Mitsui Kinzoku Co Ltd
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Filing: 1973-08-27
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Granted: 1974-12-17
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Expires: 1993-08-27
Abstract
Abstract Cluster formed on and adhering to a cathode during electrolysis of manganous sulfate solution containing calcium sulfate and magnesium sulfate in the production of electrolytic manganese dioxide is easily removed without injury to the cathode by newly effecting electrolysis but using the cathode as an anode to deposit manganese dioxide thereon and giving an impact to the depositied manganese dioxide to peel off the cluster together therewith.
Inventors
- 👤 T Kosaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:21
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/21; C25B15/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
A PROCESS FOR REMOVING CLUSTER COMPRISING ALKALINE EARTH METAL SULFATES, WHICH CLUSTER IS DEPOSITED ON A CATHODE DURING ELECTROLYSIS OF AN AQUEOUS SULFURIC ACID-MANGANOUS SULFATE SOLUTION CONTAINING THE ALKALI EARTH METAL SALTS IN THE PRODUCTION OF ELECTROLYTIC MANGANESE DIOXIDE, WHICH PROCESS COMPRISES EFFECTING THE ELECTROLYSIS OF AN AQUEOUS SULFURIC ACIDMANGANOUS SULFATE SOLUTION BY USE OF THE CATHODE HAVING THE CLUSTER DEPOSITED ON ITS SURFACE AS AN ANODE TO DEPOSIT THE ELECTROLYTIC MANGANESE DIOXIDE ON THE CLUSTER, AND GIVING AN IMPACT TO THE DEPOSITED MANGANESE DIOXIDE SO THAT THE CLUSTER IS PEELED OFF TOGETHER WITH THE MANGANESE DIOXIDE.
Claim 2
Dependent Claim
97 words
A PROCESS FOR REMOVING CLUSTER COMPRISING ALKALINE EARTH METAL SULFATES, WHICH CLUSTER IS DEPOSITED ON A CATHODE DURING ELECTROLYSIS OF AN AQUEOUS SULFURIC ACID-MANGANOUS SULFATE SOLUTION CONTAINING THE ALKALI EARTH METAL SALTS IN THE PRODUCTION OF ELECTROLYTIC MANGANESE DIOXIDE, WHICH PROCESS COMPRISES EFFECTING THE ELECTROLYSIS OF AN AQUEOUS SULFURIC ACIDMANGANOUS SULFATE SOLUTION BY USE OF THE CATHODE HAVING THE CLUSTER DEPOSITED ON ITS SURFACE AS AN ANODE TO DEPOSIT THE ELECTROLYTIC MANGANESE DIOXIDE ON THE CLUSTER, AND GIVING AN IMPACT TO THE DEPOSITED MANGANESE DIOXIDE SO THAT THE CLUSTER IS PEELED OFF TOGETHER WITH THE MANGANESE DIOXIDE.
Claim 3
Dependent Claim
20 words
A process according to claim 1, wherein the cathode having the cluster deposited thereon is made of graphite or carbon.
Claim 4
Dependent Claim
30 words
A process according to claim 1, wherein the electrolysis is effected at a temperature of 85* to 95*C under a current density of 0.6 to 1.2 A/dm2 at the anode.
Claim 5
Dependent Claim
38 words
A process according to claim 1, wherein the aqueous sulfuric acid-manganous sulfate solution containing the alkaline earth metal salts comprises 10-60 g/l of manganese, 20-100 g/l of sulfuric acid, 0.10-0.50 g/l of calcium and 20-60 g/l of magnesium.
Claim 6
Dependent Claim
37 words
A process according to claim 1, wherein the aqueous sulfuric acid-manganous sulfate solution used in the electrolysis by the use of the cathode having the cluster deposited thereon as an anode contains the alkaline earth metal salts.
References Cited (Backward Citations)
US3065155A
Cited
US3455811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |