US5887724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of treating bi-modal fly ash to remove carbon
Assignee: Pittsburgh Mineral and Environmental Technology Inc
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Filing: 1996-05-09
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Granted: 1999-03-30
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Expires: 2016-05-09
Abstract
Abstract A method of reducing the carbon content of a dry bi-modal fly ash includes subjecting the bi-modal fly ash to dry vibrating screen separation into a carbon rich component and a carbon depleted fly ash component with the carbon depleted fly ash component being created with a carbon content less than about 4 percent by weight and at least 50 weight percent of the fly ash component of the bi-modal fly ash. The dry vibrating screen separation is preferably a single step process with no prior substantial concentration of the carbon component of the bi-modal fly ash. It is preferred to employ bi-modal fly ash produced as a result of combustion of coal. A method of making a concrete mixture employing the carbon depleted component is also provided.
Inventors
- 👤 Thomas E. Weyand
- 👤 Casimir J. Koshinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:38
CPC Classifications
C; C04; C04B; C04B18/00; C04B18/04; C04B18/06; C04B18/08; B; B03; B03B; B03B9/00; B03B9/04; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10S; Y10S106/00; Y10S106/01
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
95 words
A method of reducing the carbon content of dry bi-modal fly ash comprising subjecting said bi-modal fly ash to dry vibrating screen separation to separate said bi-modal fly ash into a carbon rich component and a carbon depleted fly ash component, creating said carbon depleted fly ash component with a carbon content of less than about 4 percent by weight and at least 50 weight percent of the fly ash component of said bi-modal fly ash, and effecting said dry vibrating screen separation without any preliminary separation steps prior to said dry vibrating screen separation.
Claim 2
Independent Claim
95 words
A method of reducing the carbon content of dry bi-modal fly ash comprising subjecting said bi-modal fly ash to dry vibrating screen separation to separate said bi-modal fly ash into a carbon rich component and a carbon depleted fly ash component, creating said carbon depleted fly ash component with a carbon content of less than about 4 percent by weight and at least 50 weight percent of the fly ash component of said bi-modal fly ash, and effecting said dry vibrating screen separation without any preliminary separation steps prior to said dry vibrating screen separation.
Claim 3
Dependent Claim
16 words
The method of claim 1 including effecting said dry vibrating screen separation in a single step.
Claim 4
Dependent Claim
21 words
The method of claim 1 including employing as said dry bi-modal fly ash, fly ash produced by the combustion of coal.
Claim 5
Independent Claim
113 words
A method of reducing the carbon content of dry bi-modal fly ash comprising subjecting said bi-modal fly ash to dry vibrating screen separation to separate said bi-modal fly ash into a carbon rich component and a carbon depleted fly ash component, creating said carbon depleted fly ash component with a carbon content of less than about 4 percent by weight and at least 50 weight percent of the fly ash component of said bi-modal fly ash, effecting said dry vibrating screen separation without substantial prior concentration of the carbon component of said bi-modal fly ash, and effecting said dry vibrating screen separation with a screen having a mesh size of 200 or smaller.
Claim 6
Independent Claim
113 words
A method of reducing the carbon content of dry bi-modal fly ash comprising subjecting said bi-modal fly ash to dry vibrating screen separation to separate said bi-modal fly ash into a carbon rich component and a carbon depleted fly ash component, creating said carbon depleted fly ash component with a carbon content of less than about 4 percent by weight and at least 50 weight percent of the fly ash component of said bi-modal fly ash, effecting said dry vibrating screen separation without substantial prior concentration of the carbon component of said bi-modal fly ash, and effecting said dry vibrating screen separation with a screen having a mesh size of 200 or smaller.
Claim 7
Independent Claim
116 words
A method of reducing the carbon content of dry bi-modal fly ash comprising subjecting said bi-modal fly ash to dry vibrating screen separation to separate said bi-modal fly ash into a carbon rich component and a carbon depleted fly ash component, creating said carbon depleted fly ash component with a carbon content of less than 4 percent by weight and at least 50 weight percent of the fly component of said bi-modal fly ash, effecting said dry vibrating screen separation without substantial prior concentration of the carbon component of said bi-modal fly ash, and effecting said dry vibrating screen separation with a screen having a mesh size selected from the group consisting of 200 and 270.
Claim 8
Independent Claim
116 words
A method of reducing the carbon content of dry bi-modal fly ash comprising subjecting said bi-modal fly ash to dry vibrating screen separation to separate said bi-modal fly ash into a carbon rich component and a carbon depleted fly ash component, creating said carbon depleted fly ash component with a carbon content of less than 4 percent by weight and at least 50 weight percent of the fly component of said bi-modal fly ash, effecting said dry vibrating screen separation without substantial prior concentration of the carbon component of said bi-modal fly ash, and effecting said dry vibrating screen separation with a screen having a mesh size selected from the group consisting of 200 and 270.
Claim 9
Dependent Claim
30 words
The method of claim 5 including creating said carbon depleted component with said carbon depleted fly ash component with a carbon content of less than about 3 percent by weight.
Claim 10
Independent Claim
103 words
A method of creating a concrete mix comprising subjecting said bi-modal fly ash to dry vibrating screen separation to separate said bi-modal fly ash into a carbon rich component and a carbon depleted fly ash component, creating said carbon depleted fly ash component with a carbon content of less than 4 percent by weight and at least 50 weight percent of the fly component of said bi-modal fly ash, admixing said carbon depleted fly ash component with aggregate material to create said concrete mix, and effecting said dry vibrating screen separation without any preliminary separation steps prior to said dry vibrating screen separation.
Claim 11
Independent Claim
103 words
A method of creating a concrete mix comprising subjecting said bi-modal fly ash to dry vibrating screen separation to separate said bi-modal fly ash into a carbon rich component and a carbon depleted fly ash component, creating said carbon depleted fly ash component with a carbon content of less than 4 percent by weight and at least 50 weight percent of the fly component of said bi-modal fly ash, admixing said carbon depleted fly ash component with aggregate material to create said concrete mix, and effecting said dry vibrating screen separation without any preliminary separation steps prior to said dry vibrating screen separation.
Claim 12
Dependent Claim
16 words
The method of claim 7 including effecting said dry vibrating screen separation in a single step.
Claim 13
Dependent Claim
19 words
The method of claim 7 including employing as said dry bi-modal fly ash produced by the combustion of coal.
Claim 14
Dependent Claim
20 words
The method of claim 7 including adding water to said concrete mixture and admixing the water therewith to create concrete.
Claim 15
Independent Claim
123 words
A method of creating a concrete mix comprising subjecting a bi-modal fly ash to dry vibrating screen separation to separate said bi-modal fly ash into a carbon rich component and a carbon depleted fly ash component, creating said carbon depleted fly ash component with a carbon content of less than about 4 percent by weight and at least 50 weight percent of the fly ash component of said bi-modal fly ash, admixing said carbon depleted fly ash component with aggregate material to create said concrete mix, effecting said dry vibrating screen separation without substantial prior concentration of the carbon component of said bi-modal fly ash, and effecting said dry vibrating screen separation with a screen having a mesh size of 200 or smaller.
Claim 16
Independent Claim
123 words
A method of creating a concrete mix comprising subjecting a bi-modal fly ash to dry vibrating screen separation to separate said bi-modal fly ash into a carbon rich component and a carbon depleted fly ash component, creating said carbon depleted fly ash component with a carbon content of less than about 4 percent by weight and at least 50 weight percent of the fly ash component of said bi-modal fly ash, admixing said carbon depleted fly ash component with aggregate material to create said concrete mix, effecting said dry vibrating screen separation without substantial prior concentration of the carbon component of said bi-modal fly ash, and effecting said dry vibrating screen separation with a screen having a mesh size of 200 or smaller.
Claim 17
Independent Claim
128 words
A method of creating a concrete mix comprising subjecting a bi-modal fly ash to dry vibrating screen separation to separate said bi-modal fly ash into a carbon rich component and a carbon depleted fly ash component, creating said carbon depleted fly ash component with a carbon content of less than about 4 percent by weight and at least 50 weight percent of the fly ash component of said bi-modal fly ash, admixing said carbon depleted fly ash component with aggregate material to create said concrete mix, effecting said dry vibrating screen separation without substantial prior concentration of the carbon component of said bi-modal fly ash, and effecting said dry vibrating screen separation with a screen having a mesh size selected from the group consisting of 200 and 270.
Claim 18
Independent Claim
128 words
A method of creating a concrete mix comprising subjecting a bi-modal fly ash to dry vibrating screen separation to separate said bi-modal fly ash into a carbon rich component and a carbon depleted fly ash component, creating said carbon depleted fly ash component with a carbon content of less than about 4 percent by weight and at least 50 weight percent of the fly ash component of said bi-modal fly ash, admixing said carbon depleted fly ash component with aggregate material to create said concrete mix, effecting said dry vibrating screen separation without substantial prior concentration of the carbon component of said bi-modal fly ash, and effecting said dry vibrating screen separation with a screen having a mesh size selected from the group consisting of 200 and 270.
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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) | 2002-03-29 | 2002-09-28 | 2003-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-29 | 2006-09-28 | 2007-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-29 | 2010-09-28 | 2011-03-30 | $7700.00 | Window Closed / Lapsed |