Patent US4543104A successfully refreshed from Google Patents.
US4543104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal treatment method and product produced therefrom
Assignee: BROWN COAL Corp A CORP OF OHIO
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Filing: 1984-10-30
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Granted: 1985-09-24
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Expires: 2004-10-30
Abstract
Abstract Disclosed herein is a method for treating raw coal with ozone in aqueous suspension to modify the surface of the coal particle and release the ash constituents thereby permitting a more thorough separation of coal from ash by conventional means. The process also provides a mixture which is easily dewatered.
Inventors
- 👤 George E. Brown, Jr.
- 👤 Bruce N. Hoppert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:32
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/02; B03B; B03B1/00; B03B9/00; B03B9/005; C; C10; C10L; C10L9/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
75 words
In a process for treating crushed coal to remove sulfur and ash therefrom, wherein an agitated coal-water mixture is prepared on the basis of a solids content of about 10 to 40% by weight and ash and sulfur are subsequently removed by mechanical separation the improvement that comprises introducing into said mixture about 1/10 to 5 pounds of ozone per ton of coal and continuing to agitate said mixture for about 5 to 30 minutes.
Claim 2
Dependent Claim
75 words
In a process for treating crushed coal to remove sulfur and ash therefrom, wherein an agitated coal-water mixture is prepared on the basis of a solids content of about 10 to 40% by weight and ash and sulfur are subsequently removed by mechanical separation the improvement that comprises introducing into said mixture about 1/10 to 5 pounds of ozone per ton of coal and continuing to agitate said mixture for about 5 to 30 minutes.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein about 1/2 to 1 pound of ozone is used.
Claim 4
Dependent Claim
34 words
The process of claim 2 wherein after treatment with said ozone the coal-water mixture is rendered alkaline and subjected to an electric potential of about 6 to 24 volts at 6 to 100 amps.
Claim 5
Dependent Claim
82 words
A process for removing sulfur and ash from coal comprising: crushing the coal to a size of about 1/2 inch and less; adding water to the crushed coal so as to provide a coal-water mixture having a solids content of about 10 to 40% by weight; agitating said mixture; contacting said mixture with ozone in an amount of about 1/10 to 5 pounds of ozone per ton of coal for about 5 to 30 mintues; separating coal and ash from said mixture.
Claim 6
Dependent Claim
82 words
A process for removing sulfur and ash from coal comprising: crushing the coal to a size of about 1/2 inch and less; adding water to the crushed coal so as to provide a coal-water mixture having a solids content of about 10 to 40% by weight; agitating said mixture; contacting said mixture with ozone in an amount of about 1/10 to 5 pounds of ozone per ton of coal for about 5 to 30 mintues; separating coal and ash from said mixture.
Claim 7
Dependent Claim
14 words
The process of claim 4 wherein 1/2 to 1 pound of ozone is utilized.
Claim 8
Dependent Claim
22 words
The process of claim 5 wherein the separation of the coal and ash is effected by centrifugal means and by flotation means.
Claim 9
Dependent Claim
30 words
The process of claim 6 wherein sodium hydroxide is added to the coal-water mixture and an electric potential of 6 to 24 volts at 6 to 100 amps is applied.
Claim 10
Dependent Claim
16 words
The process of claim 2 wherein the agitation is at room temperature and at atmospheric pressure.
Claim 11
Dependent Claim
16 words
The process of claim 4 wherein the agitation is at room temperature and at atmospheric pressure.
Claim 12
Dependent Claim
31 words
A process for improving the hydrophobic properties of a coal-water mixture consisting essentially of treating the coal-water mixture with ozone in an amount of about 1/10 to 5 pounds of ozone.
Claim 13
Dependent Claim
31 words
A process for improving the hydrophobic properties of a coal-water mixture consisting essentially of treating the coal-water mixture with ozone in an amount of about 1/10 to 5 pounds of ozone.
Claim 14
Dependent Claim
20 words
The process of claim 10 wherein the coal-water mixture has a solids content of about 10 to 40% by weight.
Claim 15
Dependent Claim
24 words
The process of claim 11 wherein 1/2 to 1 pound of ozone is utilized and said mixture is agitated for at least 5 minutes.
Claim 16
Dependent Claim
14 words
The process of claim 12 wherein the process is practiced under substantially ambient conditions.
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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) | 1988-09-23 | 1989-03-25 | 1989-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-23 | 1993-03-25 | 1993-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-23 | 1997-03-25 | 1997-09-24 | $7700.00 | Window Closed / Lapsed |