US3770424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovery of aluminum from furnace skim
Assignee: Kaiser Aluminum and Chemical Corp
•
Filing: 1971-09-07
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Granted: 1973-11-06
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Expires: 1991-09-07
Abstract
Abstract A process for recovering metal values from furnace skim comprising a controlled wet comminution of the skim at a reduced work input level in a ball mill having a ball charge of from 5 to 20 percent of the internal mill volume. The comminuted product is separated into a coarse and fine fraction, the coarse fraction being substantially metal and the fine fraction being substantially non-metals such as oxides, nitrides, and the like.
Inventors
- 👤 P Floyd
- 👤 G Binczewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:03
CPC Classifications
C; C22; C22B; C22B21/00; C22B21/0038; C22B21/0069; C22B7/00; C22B7/04; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
22 words
The process of claim 1 wherein the work input is maintained between 3 and 8 net horsepower hour per ton of feed.
Claim 2
Dependent Claim
18 words
The method of claim 1 wherein the attrition-peened product is separated into coarse and fine fractions by screening.
Claim 3
Dependent Claim
21 words
The method of claim 3 wherein the screening is accomplished with a screen having mesh openings from 10 to 65 mesh.
Claim 4
Dependent Claim
16 words
The method of claim 4 wherein the screen has mesh openings from 16 to 48 mesh.
Claim 5
Dependent Claim
11 words
The process of claim 1 wherein the metal recovered is aluminum.
Claim 6
Dependent Claim
147 words
The process of recovering aluminum from furnace skim containing same comprising a. removing furnace skim from a molten aluminum furnace, b. cooling said skim, c. feeding said cooled skim to a rotary ball mill having a ball charge from about 5 to 20% of the internal mill volume, d. adding sufficient water to said mill tO effect a mixture of feed and water having a solids content from about 40 to 60% by weight, e. attrition-peening said feed in said ball mill at a work level between 3 and 8 net horsepower hours per ton of feed, the aluminum in said feed sustaining a minimum of size reduction, f. screening the attrition-peened product into coarse and fine fractions with a screen having mesh openings from about 10 to 65 mesh, and g. recovering aluminum from said coarse fraction, said recovered aluminum being readily submergible in molten aluminum.
Claim 7
Dependent Claim
14 words
The method of claim 7 wherein the skim is cooled by quenching in water.
Claim 8
Dependent Claim
22 words
The process of claim 7 wherein the product is screened with a screen having mesh openings from about 16 to 48 mesh.
Claim 9
Dependent Claim
40 words
The process of claim 8 wherein the skim removed from the molten aluminum furnace is placed in a container and the molten aluminum which separates from the skim is decanted from said container prior to quenching said skim in water.
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |