US4330090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for wrought and cast aluminum separation
Assignee: United States Department of the Interior
•
Filing: 1980-04-14
•
Granted: 1982-05-18
•
Expires: 2000-04-14
Abstract
Abstract A method of separating wrought and cast aluminum from a scrap mixture containing the two is disclosed. In this method, the scrap mixture is first heated to a temperature above the solidus temperature of the cast aluminum scrap. At this temperature, the scrap mixture is crushed thereby causing the cast aluminum to fragmentize into small pieces while merely causing flattening of the wrought aluminum. By using an appropriately sized screen, the cast aluminum fragments can then be separated from the wrought aluminum.
Inventors
- 👤 Dominic Montagna
- 👤 Harry V. Makar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:37
CPC Classifications
C; C22; C22B; C22B21/00; C22B21/0038; C22B21/0069; B; B03; B03B; B03B1/00; B03B1/02; B03B9/00; B03B9/04; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
68 words
A method of separately recovering wrought aluminum and cast aluminum from a scrap mixture of the two comprising the steps of: heating the scrap mixture to a temperature near the solidus temperature of the cast aluminum scrap; hot crushing the heated scrap in an impact apparatus so that the cast aluminum is fragmentized while the wrought aluminum is flattened; and separating the two types of aluminum by screening.
Claim 2
Independent Claim
68 words
A method of separately recovering wrought aluminum and cast aluminum from a scrap mixture of the two comprising the steps of: heating the scrap mixture to a temperature near the solidus temperature of the cast aluminum scrap; hot crushing the heated scrap in an impact apparatus so that the cast aluminum is fragmentized while the wrought aluminum is flattened; and separating the two types of aluminum by screening.
Claim 3
Dependent Claim
23 words
A method as claimed in claim 1, wherein the scrap mixture is heated to a temperature between approximately 550° C. and 580° C.
Claim 4
Dependent Claim
43 words
A method as claimed in claim 1 wherein the scrap mixture also includes magnetic particles, said method further including the step of magnetically separating the magnetic particles from the scrap mixture after the mixture has been crushed but before the mixture is screened.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |