US3979266A
Expired / Lapsed
US
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Process for purifying aqueous solutions, of metal ions precipitating as arsenides, antimonides, tellurides, and selenides
Assignee: Outokumpu Oyj
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Filing: 1975-09-08
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Granted: 1976-09-07
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Expires: 1995-09-08
Abstract
Abstract A process for purifying aqueous solutions, of metal ions precipitating as arsenides, antimonides, tellurides, selenides, and tin and mercury alloys, wherein arsenic, antimony, tellurium, selenium, tin, mercury and/or compounds of the same are added to the aqueous solution as auxiliary agents, whereafter the impurities are cemented under reducing conditions by means of the auxiliary agent, and the cementation is catalyzed by means of the formed cementate by contacting the aqueous solution with the cementate, the quantity of which is substantially greater than that primarily cemented from the aqueous solution.
Inventors
- 👤 Sigmund Peder Fugleberg
- 👤 Jussi Kalevi Rastas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:00
CPC Classifications
C; C01; C01G; C01G9/00; C01G9/06; C22; C22B; C22B19/00; C22B19/20; C22B19/26; C22B3/00; C22B3/20; C22B3/44; C22B3/46; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
78 words
A process for purifying aqueous solutions of cobalt, nickel and copper ions precipitating as arsenides, comprising: adding to the aqueous solution as an auxiliary agent at least one of arsenic and arsenic (III) compounds; maintaining reducing conditions to cement the impurities from the aqueous solution by means of said auxiliary agent; and contacting the aqueous solution with a quantity of the cementate substantially greater than that primarily cemented from the aqueous solution in order to catalyze the cementation.
Claim 2
Dependent Claim
78 words
A process for purifying aqueous solutions of cobalt, nickel and copper ions precipitating as arsenides, comprising: adding to the aqueous solution as an auxiliary agent at least one of arsenic and arsenic (III) compounds; maintaining reducing conditions to cement the impurities from the aqueous solution by means of said auxiliary agent; and contacting the aqueous solution with a quantity of the cementate substantially greater than that primarily cemented from the aqueous solution in order to catalyze the cementation.
Claim 3
Dependent Claim
33 words
The process of claim 1, in which the aqueous solution is contacted with a cementate the quantity of which is at minimum about 5g/l in proportion to the quantity of the aqueous solution.
Claim 4
Dependent Claim
39 words
The process of claim 1, wherein the impurity metals are continuously cemented in several stages from a flow of the aqueous solution, at least part of the cementate being recycled from a stage to at least one previous stage.
Claim 5
Dependent Claim
28 words
The process of claim 1, in which the aqueous solution is separated by decantation from the cementate, of which at least part is contacted with fresh aqueous solution.
Claim 6
Dependent Claim
28 words
The process of claim 1, in which the solution to be purified is the raw solution of an electrolytic zinc process the impurity metals being cobalt and nickel.
Claim 7
Dependent Claim
21 words
The process of claim 1, in which the reducing conditions are obtained and maintained by means of additions of zinc powder.
Claim 8
Dependent Claim
18 words
The process of claim 1, in which the reducing conditions are obtained and maintained by means of electrolysis.
Claim 9
Dependent Claim
17 words
The process of claim 5, in which the temperature in the cementation is within the range 70°-100°C.
Claim 10
Dependent Claim
33 words
The process of claim 1 in which the aqueous solution is contacted with a cementate the quantity of which is about 10 to 150g/l in proportion to the quantity of the aqueous solution.
Claim 11
Dependent Claim
34 words
The process of claim 1 in which the aqueous solution is contacted with a cementate the quantity of which is about 30 to 50 g/l in proportion to the quantity of the aqueous solution.
Claim 12
Dependent Claim
41 words
The process of claim 1, wherein impurity metals are continuously cemented in several stages from a flow of the aqueous solution, at least part of the cementate being recycled from the last of said stages to the first of said stages.
References Cited (Backward Citations)
US3672868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |