US3718458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid-liquid separation of cobalt from ammoniacal solutions
Assignee: Canadian Patents and Development Ltd
•
Filing: 1971-01-26
•
Granted: 1973-02-27
•
Expires: 1991-01-26
Abstract
Abstract A process for separating cobalt from an aqueous ammoniacal solution in which metals are dissolved, the solution containing at least 50 grams/liter of an ammoniacal salt and the cobalt being in the cobaltous form. The solution at pH 7-9 is contacted with a tertiary, mono-carboxylic acid of the formula WHEREIN R1, R2 and R3 are alkyl groups and the molecular chain contains 6-19 carbon atoms, preferably dissolved in an inert organic diluent. The cobalt values are extracted from the aqueous phase to the organic extract phase and the resultant cobalt loaded organic phase is separated from the remaining aqueous raffinate phase containing, for example, the nickel in solution.
Inventors
- 👤 G Ritcey
- 👤 B Lucas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:32
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/32; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
13 words
A process according to claim 1 wherein the ammonium salt is ammonium sulphate.
Claim 2
Dependent Claim
26 words
A process according to claim 2 wherein the tertiary, mono-carboxylic acid is dissolved in an inert organic diluent which is substantially immiscible with the aqueous solution.
Claim 3
Dependent Claim
19 words
A process according to claim 3 wherein the tertiary, mono-carboxylic acid contains 9-11 carbon atoms in the molecular chain.
Claim 4
Dependent Claim
15 words
A process according to claim 2 wherein the extraction is conducted at about pH 8.
Claim 5
Dependent Claim
17 words
A process according to claim 2, wherein the ammonium sulphate solution has a concentration above 150 g/l.
Claim 6
Dependent Claim
17 words
A process according to claim 2, wherein the ammonium sulphate solution has a concentration above 250 g/l.
Claim 7
Dependent Claim
23 words
A process according to claim 2, wherein the ammonium sulphate solution contains 0.1 to 50 g/l cobalt and 0.1 to 50 g/l nickel.
Claim 8
Dependent Claim
18 words
A process according to claim 2 wherein a multiple stagewise contact with the tertiary, mono-carboxylic acid is used.
Claim 9
Dependent Claim
24 words
A process according to claim 2 wherein the cobalt loaded organic phase is scrubbed with a cobalt ammonium sulphate solution to remove residual nickel.
Claim 10
Dependent Claim
24 words
A process according to claim 2 wherein the cobalt is stripped from the loaded organic phase by being contacted with a mineral acid solution.
Claim 11
Dependent Claim
16 words
A process according to claim 11 wherein the mineral acid is sulphuric, nitric or hydrochloric acid.
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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |