Patent US4072539A successfully refreshed from Google Patents.
US4072539A
Expired / Lapsed
US
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Method of cleaning raw ore
Assignee: Individual
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Filing: 1976-11-22
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Granted: 1978-02-07
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Expires: 1996-11-22
Abstract
Abstract A method of cleaning a raw ore product such as coal is disclosed wherein the ore product temperature is increased up to about 200°-212° F. before water is separated therefrom whereby the moisture content of the cleaned product is controlled. The ore product is passed through a bath of hot water, then surface water is removed before the ore product is moved through an evaporative cooler in a downward direction while being subjected to air at ambient temperature and at an air capacity of between 10,000 and 15,000 cubic feet per ton of ore product.
Inventors
- 👤 William Benzon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:32
CPC Classifications
B; B03; B03B; B03B9/00; B03B9/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
A method of cleaning a raw ore product such as coal comprising the steps of heating the ore product by conveying the ore product through a bath of hot water, then removing surface water from the ore product, and then drying the ore product to the desired moisture content by use of an evaporative cooler, said ore product moving through said evaporative cooler in a downward direction while being contacted by moving air traveling in a transverse direction, said air moving at a rate of substantially between 10,000 and 15,000 cubic feet per ton of ore product.
Claim 2
Independent Claim
97 words
A method of cleaning a raw ore product such as coal comprising the steps of heating the ore product by conveying the ore product through a bath of hot water, then removing surface water from the ore product, and then drying the ore product to the desired moisture content by use of an evaporative cooler, said ore product moving through said evaporative cooler in a downward direction while being contacted by moving air traveling in a transverse direction, said air moving at a rate of substantially between 10,000 and 15,000 cubic feet per ton of ore product.
Claim 3
Dependent Claim
42 words
A method in accordance with claim 1 including heating the bath of water by introducing steam thereinto while the ore product is conveyed through the bath, and using a centrifuge to perform said step of removing surface water from the ore product.
Claim 4
Dependent Claim
37 words
A method in accordance with claim 1 including the step of rinse screening the ore product before said heating step so that the thusly processed ore product has a size greater than the size of the screen.
Claim 5
Independent Claim
180 words
A method of cleaning raw ore products comprising the steps of subjecting the raw ore products to a rinse screen wherein the ore products are divided into two flow paths based on the size of the screen, heating the large sized ore products by conveying them through a bath of hot water, and then removing surface water from the heated larger sized ore products, then drying the said heated larger sized ore product to the desired moisture content by use of an evaporative cooler, said drying of the larger sized ore products occurring while the ore products are moving downwardly through the evaporative cooler and are being subjected to air at ambient temperature wherein the air capacity is substantially between 10,000 and 15,000 cubic feet per ton of the larger sized ore product, removing tailings from the smaller sized ore products, then heating the smaller sized ore products to a temperature less than about 212° F., and then drying the smaller size ore products to a moisture content greater than the moisture content of the dried larger sized ore products.
Claim 6
Independent Claim
180 words
A method of cleaning raw ore products comprising the steps of subjecting the raw ore products to a rinse screen wherein the ore products are divided into two flow paths based on the size of the screen, heating the large sized ore products by conveying them through a bath of hot water, and then removing surface water from the heated larger sized ore products, then drying the said heated larger sized ore product to the desired moisture content by use of an evaporative cooler, said drying of the larger sized ore products occurring while the ore products are moving downwardly through the evaporative cooler and are being subjected to air at ambient temperature wherein the air capacity is substantially between 10,000 and 15,000 cubic feet per ton of the larger sized ore product, removing tailings from the smaller sized ore products, then heating the smaller sized ore products to a temperature less than about 212° F., and then drying the smaller size ore products to a moisture content greater than the moisture content of the dried larger sized ore products.
Claim 7
Dependent Claim
22 words
A method in accordance with claim 4 including mixing the dried ore products to obtain a mixture having an intermediate moisture content.
Claim 8
Dependent Claim
33 words
A method in accordance with claim 4 wherein each of said drying steps includes subjecting the ore product to a temperature not more than 212° F. and not less than about 150° F.
Claim 9
Dependent Claim
28 words
A method in accordance with claim 4 wherein said ore product is coal, and the larger sized coal pieces being dried to a moisture content of about 1-2%.
References Cited (Backward Citations)
US1880273A
Cited
US1905945A
Cited
US2956347A
Cited
US3056212A
Cited
US3092471A
Cited
US3579442A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |