US4346010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering fine coal particles from slurry of finely divided coal
Assignee: Kanadevia Corp
•
Filing: 1981-04-07
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Granted: 1982-08-24
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Expires: 2001-04-07
Abstract
Abstract Fine coal particles are recovered from a slurry of finely divided coal by mixing coarsely divided coal and a binder together to cause the binder to adhere to the surfaces of the coarsely divided coal pieces, mixing the slurry with the coal pieces having the binder adhered thereto to cause fine coal particles to adhere to the binder over the surfaces of the coal pieces serving as nuclei and thereby form agglomerates, and separating the agglomerates from the remaining slurry portion to recover the fine coal particles along with the coarsely divided coal and the binder.
Inventors
- 👤 Etsuo Ogino
- 👤 Nobuo Yoshii
- 👤 Kazuo Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:05
CPC Classifications
C; C10; C10L; C10L5/00; C10L5/02; C10L5/06; B; B03; B03B; B03B1/00; B03B1/04; B03B5/00; B03B5/48; B03B5/58; B03B9/00; B03B9/005
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
108 words
A process for recovering fine coal particles from a slurry of finely-divided coal, comprising the steps of: mixing coarsely divided coal and a binder together to cause the binder to adhere to the surfaces of the coarsely divided coal pieces; thereafter mixing the slurry of the finely-divided coal with the coal pieces having the binder adhered thereto to cause fine coal particles to adhere to the binder over the surfaces of the coal pieces serving as nuclei so as to thereby form agglomerates; and subsequently separating the agglomerates from the remaining slurry portion to recover the fine coal particles along with the coarsely divided coal and the binder.
Claim 2
Dependent Claim
108 words
A process for recovering fine coal particles from a slurry of finely-divided coal, comprising the steps of: mixing coarsely divided coal and a binder together to cause the binder to adhere to the surfaces of the coarsely divided coal pieces; thereafter mixing the slurry of the finely-divided coal with the coal pieces having the binder adhered thereto to cause fine coal particles to adhere to the binder over the surfaces of the coal pieces serving as nuclei so as to thereby form agglomerates; and subsequently separating the agglomerates from the remaining slurry portion to recover the fine coal particles along with the coarsely divided coal and the binder.
Claim 3
Dependent Claim
23 words
A process as defined in claim 1 wherein the coarsely divided coal pieces are larger than 500μ but not larger than 25 mm.
Claim 4
Dependent Claim
22 words
A process as defined in claim 1 wherein the finely divided coal of the slurry is up to 500μ in particle size.
Claim 5
Dependent Claim
27 words
A process as defined in claim 1, wherein the binder is selected from the group consisting of fuel oil, kerosene, gas oil, residuum oil and vegetable oil.
Claim 6
Dependent Claim
27 words
A process as defined in claim 1 wherein the binder is used in an amount of 5 to 15% by weight based on the coarsely divided coal.
Claim 7
Dependent Claim
43 words
A process as defined in claim 1, wherein as an initial step, feeding a slurry comprising finely-divided coal pieces dispersed in water to a liquid cyclone and separating off the relatively course coal particles included in the finely-divided coal pieces in the slurry.
References Cited (Backward Citations)
US1421862A
Cited
US3045818A
Cited
US3230282A
Cited
US3268071A
Cited
US3856668A
Cited
US4255155A
Cited
US4248697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-23 | 1986-02-22 | 1986-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-23 | 1990-02-22 | 1990-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-23 | 1994-02-22 | 1994-08-24 | $7700.00 | Window Closed / Lapsed |