Patent US4021206A successfully refreshed from Google Patents.
US4021206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separating coal particles from water
Assignee: Shell USA Inc
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Filing: 1976-02-03
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Granted: 1977-05-03
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Expires: 1996-02-03
Abstract
Abstract The invention relates to a process for separating coal particles in a coal/water slurry from water of the slurry by separating the larger coal particles with a relatively small quantity of water from the smaller coal particles with a relatively large quantity of water and then agglomerating the smaller coal particles and separating the agglomerates from the water.
Inventors
- 👤 Leo J. Th. J. Huberts
- 👤 Eke Verschuur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:00
CPC Classifications
C; C10; C10L; C10L5/00; C10L5/02; C10L5/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
130 words
A process for separating coal particles in a coal/water slurry from water of the slurry to form a relatively dry and substantially ash-free, dust-free product of larger coal particles and agglomerates of smaller coal particles comprising the steps of: a. supplying the slurry to a separator wherein the larger coal particles together with a relatively small quantity of water are separated from the slurry as supplied, so that a second slurry remains comprising the smaller coal particles and a relatively large quantity of water; b. passing the second slurry to an agglomeration device; c. introducing a relatively small quantity of binder and the second slurry into the agglomeration device so that agglomerates of the smaller coal particles and the binder are formed; and d. separating the agglomerates from the water.
Claim 2
Dependent Claim
130 words
A process for separating coal particles in a coal/water slurry from water of the slurry to form a relatively dry and substantially ash-free, dust-free product of larger coal particles and agglomerates of smaller coal particles comprising the steps of: a. supplying the slurry to a separator wherein the larger coal particles together with a relatively small quantity of water are separated from the slurry as supplied, so that a second slurry remains comprising the smaller coal particles and a relatively large quantity of water; b. passing the second slurry to an agglomeration device; c. introducing a relatively small quantity of binder and the second slurry into the agglomeration device so that agglomerates of the smaller coal particles and the binder are formed; and d. separating the agglomerates from the water.
Claim 3
Dependent Claim
45 words
The process as claimed in claim 1, wherein the coal/water slurry contains free fine ash particles which remain in the second slurry after the separation according to step a, and remain in the water after separating the agglomerates from the water of the second slurry.
Claim 4
Dependent Claim
22 words
The process as claimed in claim 1, wherein the separation according to step a is carried out by means of a centrifuge.
Claim 5
Dependent Claim
20 words
The process as claimed in claim 1, wherein a further quantity of water is separated from said larger coal particles.
Claim 6
Dependent Claim
23 words
The process as claimed in claim 4, wherein the further separation of water from the larger coal particles is carried out by centrifuging.
Claim 7
Dependent Claim
23 words
The process as claimed in claim 4, wherein the further separation of water from the larger coal particles is carried out by filtering.
Claim 8
Dependent Claim
21 words
The process as claimed in claim 1, wherein, before withdrawing the agglomerates as a product, the agglomerates are converted to briquettes.
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) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |