Patent US3580537A successfully refreshed from Google Patents.
US3580537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for dressing asbestos ore waste
Assignee: HAZEMAG HARTZERKLEINERUNG
•
Filing: 1969-06-19
•
Granted: 1971-05-25
•
Expires: 1989-06-19
Abstract
Abstract A process for dressing asbestos ore waste in which the waste material is dried by whirling it through a stream of hot gas to prevent encrustation of the material during the drying process and to separate at least some of the asbestos fibers from the ore waste and by subsequently comminuting the material in an impact breaker to separate substantially all remaining fibers from the ore and the fibers from each other.
Inventors
- 👤 Ehrhardt Andreas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:39
CPC Classifications
B; B02; B02C; B02C21/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
21 words
A process as defined in claim 1, wherein the asbestos ore waste is dried to a moisture content of 1-2 percent.
Claim 2
Dependent Claim
18 words
A process as defined in claim 2, wherein said hot gas has a minimum temperature of 300* C.
Claim 3
Dependent Claim
25 words
A process as defined in claim 3, wherein said forceful agitation of the asbestos ore waste durinG the drying is carried out by mechanical means.
Claim 4
Dependent Claim
98 words
A process as defined in claim 3, wherein said step of drying the asbestos waste comprises the steps of feeding the ore waste in one end of an elongated substantially horizontally arranged container, passing a stream of said hot gas from one to the other end of said container, and subjecting the ore waste to the action of fast rotating impact members arranged in the bottom region of the container so that the ore waste is repeatedly upwardly thrown in the container and transported by the gas stream from the one to the other end of the container.
Claim 5
Dependent Claim
101 words
A process as defined in claim 5 and including the steps of discharging the heavy particles of the ore waste from the bottom region of the other end of the container and sucking a mixture of moisture laden gas, light particles of the waste, separated fibers and dust out from the upper region of the other end of the container, separating at least the gas and dust from the mixture and subjecting the remainder of said mixture and the heavy particles discharged from the bottom region at the other end of the container to the comminuting action in the impact breaker.
Claim 6
Dependent Claim
22 words
A process as defined in claim 1, wherein said asbestos ore waste is dried to a maximum moisture content of 1 percent.
Claim 7
Dependent Claim
20 words
A process as defined in claim 7, wherein said hot gas has a temperature of between 300* and 900* C.
Claim 8
Dependent Claim
18 words
A process as defined in claim 8, wherein said hot gas comprises the flue gases of a furnace.
Claim 9
Dependent Claim
27 words
A process as defined in claim 3, wherein the material is comminuted in said impact breaker until the asbestos fibers are also completely separated from each other.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |