US4157946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for selective removal of bismuth and antimony from an electrolyte, especially in electrolytic refining of copper
Assignee: Outokumpu Oyj
•
Filing: 1978-10-02
•
Granted: 1979-06-12
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Expires: 1998-10-02
Abstract
Abstract Antimony and bismuth are selectively removed from an electrolyte solution, especially a solution used for the electrolytic refining of copper by adding to the electrolyte solution a carbonate of barium, strontium, or lead.
Inventors
- 👤 Olli V. J. Hyvarinen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:55
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/20; C22B3/44; C22B3/46; C25; C25C; C25C1/00; C25C1/12; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
62 words
A process for the selective removal of antimony and bismuth from an electrolyte solution containing at least 150 g/l H 2 SO 4 , comprising adding to the electrolyte solution a salt of a cation selected from the group consisting of barium, strontium and lead to precipitate said cation from the solution as a poorly soluble sulfate, co-precipitating the bismuth and antimony.
Claim 2
Dependent Claim
62 words
A process for the selective removal of antimony and bismuth from an electrolyte solution containing at least 150 g/l H 2 SO 4 , comprising adding to the electrolyte solution a salt of a cation selected from the group consisting of barium, strontium and lead to precipitate said cation from the solution as a poorly soluble sulfate, co-precipitating the bismuth and antimony.
Claim 3
Dependent Claim
12 words
The process of claim 1, in which the salt is a carbonate.
Claim 4
Dependent Claim
26 words
The process of claim 2, in which a maximum of 20 g of BaCO 3 /one liter of electrolyte solution is added to the electrolyte solution.
Claim 5
Dependent Claim
32 words
The process of claim 1, comprising performing the co-precipitation in a side flow of the electrolyte solution; separating the precipitate from the side flow; and recycling the side flow to the electrolysis.
Claim 6
Dependent Claim
18 words
The process of claim 1, in which the temperature of the solution is 20°-90° C. during the co-precipitation.
Claim 7
Dependent Claim
20 words
The process of claim 1, in which the electrolyte solution is a solution used for the electrolytic refining of copper.
References Cited (Backward Citations)
US607646A
Cited
US3914163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-06-11 | 1982-12-11 | 1983-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-11 | 1986-12-11 | 1987-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-11 | 1990-12-11 | 1991-06-12 | $7700.00 | Window Closed / Lapsed |