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US4412893A
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Anode-assisted cation reduction
Assignee: BTG International Ltd
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Filing: 1983-02-08
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Granted: 1983-11-01
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Expires: 2003-02-08
Abstract
Abstract A method of cation reduction by anode-assisted electrolysis comprises electrolyzing cations at a cathode of a cell in which the anolyte contains ferrous ion as a reducing agent, with relative motion between the anode and the anolyte such as to promote contact of the anode with ferrous ion despite their mutual electrostatic repulsion, wherein the concentration of the ferrous ion is from 0.5 to 10 g/l. The relative motion between the anode and the anolyte can take the form of air-sparging. The method can be used to produce copper metal from copper solution. While static relationship is maintained between the cathode and the catholyte, the anolyte being in free communication with the catholyte.
Inventors
- 👤 Derek J. Fray
- 👤 John P. Chilton
- 👤 Arthur V. Cooke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:55
CPC Classifications
C; C25; C25B; C25B1/00; C25C; C25C1/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
A method of reduction of cations more noble than iron by anode-assisted electrolysis comprising electrolyzing cations at a cathode of a cell in which the anolyte contains ferrous ion as a reducing agent, the electrolysis conducted while the anolyte is agitated or the anode is moved with respect to the anolyte thereby providing relative motion between the anode and the anolyte such as to promote contact of the anode with ferrous ion despite their mutual electrostatic repulsion, while at the same time maintaining a static relationship between the cathode and the catholyte, and the anolyte is in free communication with the catholyte wherein the concentration of the ferrous ion is from 0.5 to 10 g/l and the anode is of platinum, graphite, platinized titanium, platinized titanium including therein platinum oxide, titanium coated with iridium oxide, or iridium oxide on a platinum support.
Claim 2
Independent Claim
142 words
A method of reduction of cations more noble than iron by anode-assisted electrolysis comprising electrolyzing cations at a cathode of a cell in which the anolyte contains ferrous ion as a reducing agent, the electrolysis conducted while the anolyte is agitated or the anode is moved with respect to the anolyte thereby providing relative motion between the anode and the anolyte such as to promote contact of the anode with ferrous ion despite their mutual electrostatic repulsion, while at the same time maintaining a static relationship between the cathode and the catholyte, and the anolyte is in free communication with the catholyte wherein the concentration of the ferrous ion is from 0.5 to 10 g/l and the anode is of platinum, graphite, platinized titanium, platinized titanium including therein platinum oxide, titanium coated with iridium oxide, or iridium oxide on a platinum support.
Claim 3
Dependent Claim
11 words
The method according to claim 1, wherein the anolyte is agitated.
Claim 4
Dependent Claim
18 words
The method according to claim 2, wherein the anolyte is agitated by air-sparging or by a paddle member.
Claim 5
Dependent Claim
14 words
The method according to claim 1, wherein the anode is reciprocated, oscillated or rotated.
Claim 6
Dependent Claim
16 words
The method according to claim 1, wherein the anolyte is at a temperature of 20°-100° C.
Claim 7
Dependent Claim
18 words
The method according to claim 1, wherein the concentration of the ferrous ion is at least 1 g/l.
Claim 8
Dependent Claim
18 words
The method according to claim 1, wherein the concentration of the ferrous ion does not exceed 6 g/l.
Claim 9
Dependent Claim
17 words
The method according to claim 1, wherein the cation is reduced to the element at the cathode.
Claim 10
Dependent Claim
17 words
The method according to claim 8, wherein the cation is of copper, silver, nickel, cobalt or hydrogen.
Claim 11
Dependent Claim
30 words
The method according to claim 8, wherein the cation is of a metal less noble than iron, and wherein an ion-selective diaphragm separates the anode compartment from the cathode compartment.
Claim 12
Dependent Claim
14 words
A method according to claim 10, wherein the metal is zinc, manganese or chromium.
References Cited (Backward Citations)
US3761369A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |