US3751243A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Procedure for quenching dross
Assignee: Alcan Research and Development Ltd
•
Filing: 1971-01-08
•
Granted: 1973-08-07
•
Expires: 1991-01-08
Abstract
Abstract For quenching dross skimmed from a molten aluminum surface, the dross is placed in a container in successive layers separated by layers of particulate salt. Heat is taken up from the dross not only in elevating the temperature of the salt, but also as heat of fusion of the salt. The salt used may comprise one or more components of a salt flux suitable for employment in subsequent procedures to recover free metal from the dross.
Inventors
- 👤 M Mcleod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:03
CPC Classifications
C; C22; C22B; C22B7/00; C22B7/04; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
23 words
Procedure according to claim 1, wherein said salt comprises at least one chloride selected from the class consisting of sodium and potassium chlorides.
Claim 2
Dependent Claim
178 words
In procedure for quenching dross formed on a molten aluminum surface, the steps of a. removing successive quantities of the dross from the molten surface, said dross containing at least a substantial proportion of free metal in intimate mixture with non-metallic material and being spreadable in layers when initially removed from the molten surface, and placing these quantities as plural successive layers of dross in a container while b. covering each of said layers of dross with a layer of salt essentially immediately upon placing the dross layer in the container and before placing the next layer of dross in the container so that the plural successive layers of dross are separated by layers of salt, said salt as supplied to the container being in divided solid form and having a melting point lower than the temperature of the dross as delivered to the container from the molten surface, c. each of said layers of dross being not more than about six inches thick and each of said layers of salt being at least about one inch thick.
Claim 3
Dependent Claim
33 words
Procedure according to claim 3, wherein the amount of salt placed in said container is equal to at least about 20 percent by weight of the amount of dross placed in said container.
Claim 4
Dependent Claim
26 words
Procedure according to claim 3, wherein a layer of salt is placed in said container prior to placing the first layer of dross in said container.
Claim 5
Dependent Claim
16 words
Procedure according to claim 3, wherein said salt comprises a mixture of sodium and potassium chlorides.
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |