Patent US3607236A successfully refreshed from Google Patents.
US3607236A
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Reclaiming of superalloy scrap
Assignee: DALE A MARTIN
•
Filing: 1969-09-22
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Granted: 1971-09-21
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Expires: 1989-09-22
Abstract
Abstract Valuable metals are recovered from superalloy scrap by a series of process steps comprising (1) dissolution of the scrap in chlorinated acidic aqueous solution, (2) removal of tungsten and silica by adsorption on activated carbon, (3) extraction of molybdenum with a water-immiscible organic phosphate or phosphonate, (4) extraction of iron with a water-immiscible secondary amine, (5) extraction of cobalt with a water-immiscible tertiary amine, (6) precipitation of chromium as a hydrous basic sulfate, and nickel recovery.
Inventors
- 👤 Parkman T Brooks
- 👤 Dale A Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:55
CPC Classifications
C; C22; C22B; C22B3/00; C22B3/04; C22B3/06; C22B3/10; C22B3/20; C22B3/26; C22B3/38; C22B3/384; C22B3/3846; C22B3/22; C22B3/24; C22B3/28; C22B3/282; C22B3/3844; C22B3/44; C22B34/00; C22B34/30; C22B7/00; C22B7/006; C22B7/007; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
24 words
The process of claim 1 in which the molybdenum is extracted with a solution of the phosphate or phosphonate in a water-immiscible organic diluent.
Claim 2
Dependent Claim
11 words
The process of claim 2 in which the extractant is trioctylphosphate.
Claim 3
Dependent Claim
13 words
The process of claim 2 in which the extractant is bis (2-ethylhexyl) 2-ethylhexylphosphonate.
Claim 4
Dependent Claim
11 words
The process of claim 2 in which the diluent is Kerosene.
Claim 5
Dependent Claim
19 words
The process of claim 2 in which the feed solution contains at least 150 grams of chloride per liter.
Claim 6
Dependent Claim
18 words
The process of claim 2 in which the pH of the feed solution is not greater than 1.0.
Claim 7
Dependent Claim
19 words
The process of claim 2 in which the EMF of the feed solution is more negative than -350 mv.
Claim 8
Dependent Claim
17 words
The process of claim 1 in which iron in the feed solution is oxidized prior to extraction.
Claim 9
Dependent Claim
14 words
The process of claim 9 in which oxidation is effected by saturation with chlorine.
Claim 10
Dependent Claim
22 words
The process of claim 1 in which the iron is extracted with a solution of the amine in a water-immiscible organic diluent.
Claim 11
Dependent Claim
25 words
The process of claim 11 in which the extractant is a dodecenyltrialkylmethyl amine having a molecular weight in the range of about 350 to 400.
Claim 12
Dependent Claim
13 words
The process of claim 11 in which the diluent is an aromatic naphtha.
Claim 13
Dependent Claim
19 words
The process of claim 11 in which the feed solution contains at least 100 grams of chloride per liter.
Claim 14
Dependent Claim
17 words
The process of claim 11 in which the pH of the feed solution is 3 or less.
Claim 15
Dependent Claim
48 words
The process of claim 1 in which the precipitation of chromium comprises the steps of (1) addition of a soluble sulfate, an alkali and water, (2) aging the resulting solution, (3) cooling the aged solution and further addition of alkaline solution, and (4) heating the solution to boiling.
Claim 16
Dependent Claim
65 words
The process of claim 16 in which the soluble sulfate is added in step (1) in amount of about one part of sulfate ion per part of chromium, alkali is added in step (1) in an amount to give a pH of about 2.5 and water is added in step (1) in an amount to give a chromium concentration of about 20 grams per liter.
Claim 17
Dependent Claim
13 words
The process of claim 16 in which the soluble sulfate is sodium sulfate.
Claim 18
Dependent Claim
12 words
The process of claim 16 in which the alkali is sodium carbonate.
Claim 19
Dependent Claim
20 words
The process of claim 16 in which the aging of step (1) is for a period of about 16 hours.
Claim 20
Dependent Claim
19 words
The process of claim 16 in which the aged solution is cooled to about 10* C. in step (3).
Claim 21
Dependent Claim
26 words
The process of claim 16 in which the addition of alkaline solution in step (3) is in an amount to lower the pH to about 3.4.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |