US4286994A
Expired / Lapsed
US
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Method for the use of the gypsum occurring in flue gas desulfurizing installations, operated on a lime basis
Assignee: Saarbergwerke AG
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Filing: 1979-07-30
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Granted: 1981-09-01
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Expires: 1999-07-30
Abstract
Abstract Method for the use of flue gas desulfurizing gypsum occurring in flue gas desulfurizing installations operated on a lime basis, characterized by mixing the flue gas desulfurizing gypsum with dehydrated natural gypsum after its partial or complete dehydration.
Inventors
- 👤 Rudolf Muller
- 👤 Hans-Guido Klinkner
- 👤 Gunter Culmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:00
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/46; C01F11/464; C04; C04B; C04B11/00; C04B11/26; C04B11/262; C04B11/264; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
37 words
Method for the use of flue gas desulfurizing gypsum occurring in flue gas desulfurizing installations operated on a lime basis, comprising mixing the flue gas desulfurizing gypsum with dehydrated natural gypsum after its partial or complete dehydration.
Claim 2
Dependent Claim
37 words
Method for the use of flue gas desulfurizing gypsum occurring in flue gas desulfurizing installations operated on a lime basis, comprising mixing the flue gas desulfurizing gypsum with dehydrated natural gypsum after its partial or complete dehydration.
Claim 3
Dependent Claim
53 words
Method for the use of flue gas desulfurizing gypsum occurring in flue gas desulfurizing installations operated on a lime basis comprising mixing flue gas desulfurizing gypsum in with a natural gypsum in the form of dihydrate, and the dehydration to a semihydrate and/or anhydrite takes place together with the dehydration of natural gypsum.
Claim 4
Dependent Claim
53 words
Method for the use of flue gas desulfurizing gypsum occurring in flue gas desulfurizing installations operated on a lime basis comprising mixing flue gas desulfurizing gypsum in with a natural gypsum in the form of dihydrate, and the dehydration to a semihydrate and/or anhydrite takes place together with the dehydration of natural gypsum.
Claim 5
Dependent Claim
30 words
Method according to claims 1 or 2 comprising providing the fraction of flue gas desulfurizing gypsum in the mixture between 5 and 50 wt.%, preferably between 5 and 30 wt.%.
Claim 6
Dependent Claim
24 words
Method according to claim 1, comprising using waste heat from a power plant for partial and/or complete dehydrating of the flue gs desulfurizing gypsum.
Claim 7
Dependent Claim
40 words
Method according to claim 2 comprising using waste heat from a power plant for dehydration of the mixture of flue gas desulfurizing gypsum and natural gypsum in the form of a dihydrate for said dehydration to a semi-hydrate and/or anhydrite.
References Cited (Backward Citations)
US3855391A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |