Patent US3969476A successfully refreshed from Google Patents.
US3969476A
Expired / Lapsed
US
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Solvent-in-pulp extraction
Assignee: Ministry of Natural Resources and Wildlife
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Filing: 1974-02-19
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Granted: 1976-07-13
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Expires: 1994-02-19
Abstract
Abstract In solvent-in-pulp extractions where aqueous leach slurries containing dissolved metal values and gangue particles of the silica, sericite or sulphide types are contacted with organic amine extractants, the loss of amine extractant to the solids is decreased sharply by pretreating the slurries with organic non-ionic hydrophilic material which is adsorbed by the gangue solids and decreases the affinity of the gangue solids for the amine. A combination of inexpensive materials has been found to be most effective. Crud formation is substantially avoided and the separation of phases is facilitated.
Inventors
- 👤 Bernard H. Lucas
- 👤 Gordon M. Ritcey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:45
CPC Classifications
B; B03; B03B; B03B1/00; B03B1/04; C; C22; C22B; C22B3/00; C22B3/20; C22B3/26; C22B3/28; C22B3/282; C22B3/44; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
81 words
In a process for the solvent extraction of an aqueous leach slurry containing dissolved metal values, and gangue particles selected from the group consisting of the silica, sericite and sulphide types, with organic amine extractants, at least part of said metal values being extractable by said amine extractants, the improvement comprising pretreating the leach slurry with a fish glue material which is adsorbed onto the gangue solids, the pretreated gangue solids having decreased affinity for the amine extractant during the extraction.
Claim 2
Dependent Claim
81 words
In a process for the solvent extraction of an aqueous leach slurry containing dissolved metal values, and gangue particles selected from the group consisting of the silica, sericite and sulphide types, with organic amine extractants, at least part of said metal values being extractable by said amine extractants, the improvement comprising pretreating the leach slurry with a fish glue material which is adsorbed onto the gangue solids, the pretreated gangue solids having decreased affinity for the amine extractant during the extraction.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein sodium silicate is also present during the pretreatment.
Claim 4
Dependent Claim
15 words
The process of claim 2 wherein treatment with sodium silicate precedes treatment with fish glue.
Claim 5
Dependent Claim
18 words
The process of claim 2 wherein the fish glue and sodium silicate are used in approximately equal proportions.
Claim 6
Dependent Claim
18 words
The process of claim 4 wherein about 0.3 - 0.5 lb./ton dry solids of each additive is used.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |