US3721729A
Expired / Lapsed
US
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Process for the separation of cadmium and nickel
Assignee: DEUTSCHE GOLD und SILBER SCHEIDEANSTALT DT
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Filing: 1970-10-15
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Granted: 1973-03-20
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Expires: 1990-10-15
Abstract
Abstract Cadmium and nickel are separated from an aqueous solution of their salts, which solution contains not over 200 grams per liter of cadmium and nickel, by adding ammonia, precipitating the cadmium as the carbonate with alkali carbonate, and heating the filtrate with alkali hydroxide to precipitate nickel as the hydroxide. The amount of ammonia depending on the amount of nickel in the range of 10 to 100 grams of nickel per liter is varied between 8 and 4 moles per liter.
Inventors
- 👤 P Tilp
- 👤 Schrepping K Schulte
- 👤 L Kaufmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:48
CPC Classifications
C; C22; C22B; C22B17/00; C22B17/04; C22B23/00; C22B23/04; C22B23/0453; C22B23/0461; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
23 words
A process according to claim 1 wherein the nickel remaining in solution is precipitated as the hydroxide by heating with alkali metal hydroxide.
Claim 2
Dependent Claim
17 words
A process according to claim 2 wherein the salts are salts of sulfuric acid or hydrochloric acid.
Claim 3
Dependent Claim
28 words
A process according to claim 3 wherein the salts are salts of sulfuric acid, the ratio of cadmium to nickel in the solution is from 1:0.1 to 1:1.
Claim 4
Dependent Claim
52 words
A process according to claim 2 wherein the amount of ammonia is selected to correspond to the equation y x/(ax2 + bx + c) where y is the molar amount of NH3, x is the nickel concentration in grams per liter, a is 0.000021, b is 0.217 and c is - 1.09.
Claim 5
Dependent Claim
37 words
A process according to claim 2 wherein there is added to the solution prior to the addition of the carbonate the ammonium salt of the mineral acid in an amount of 20 to 40 grams per liter.
Claim 6
Dependent Claim
37 words
A process according to claim 2 wherein the cadmium carbonate only is precipitated by adding the alkali metal carbonate in an amount of 10% over the amount theoretically necessary to precipitate all of the cadmium and nickel.
Claim 7
Dependent Claim
18 words
A process according to claim 7 wherein the alkali metal carbonate is added as a 20 percent solution.
Claim 8
Dependent Claim
21 words
A process according to claim 1 wherein the cadmium salt and the nickel salt are salts of the same mineral acid.
Claim 9
Dependent Claim
44 words
A process according to claim 1 wherein the mineral acid salts are salts of a member of the group consisting of sulfuric acid and hydrochloric acid, the ratio of cadmium to nickel in the solution is from 1 : 0.1 to 1 : 1.
Claim 10
Dependent Claim
18 words
A process according to claim 10 wherein the cadmium and nickel salts are both salts of sulfuric acid.
Claim 11
Dependent Claim
18 words
A process according to claim 10 wherein the cadmium and nickel salts are both salts of hydrochloric acid.
Claim 12
Dependent Claim
53 words
A process according to claim 10 wherein the cadmium and nickel salts are both salts of the same mineral acid and wherein there is added to the solution prior to the addition of the carbonate the ammonium salt of the same mineral acid in an amount of 20 to 40 grams per liter.
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |