US4136998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the disposal of the residue of the exhaust gas washers of furnaces in particular bituminous coal power stations
Assignee: RAG AG
•
Filing: 1977-01-27
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Granted: 1979-01-30
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Expires: 1997-01-27
Abstract
Abstract A process for disposing of the residue of exhaust gas washers by utilizing them as a structural material in mines. The sulfur in the exhaust gases is reacted with calcium compounds to form CaSO 4 .2H 2 O. The CaSO 4 .2H 2 O is recrystallized to alpha-CaSO 4 .1/2H 2 O, conveyed underground, mixed with water, implaced and allowed to harden to form barricades or other structures in the mine.
Inventors
- 👤 Friedrich-Karl Bassier
- 👤 Klaus Goldschmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:25
CPC Classifications
B; B03; B03B; B03B9/00; B03B9/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
136 words
A process for utilizing the residues of a thermal energy power plant washer for forming protective structures within a mine proximate to said power plant comprising the steps of: reacting the sulfur bearing exhaust gases of the power plant with a calcium compound in the washer to form a CaSO 4 compound: disassociating and recrystallizing substantially all of the CaSO 4 compound to form alpha-CaSO 4 .1/2 H 2 O in dry form by heating the CaSO 4 compound with thermal energy obtained from the power plant; conveying the alpha-CaSO 4 .1/2 H 2 O in dry form to the interior of the mine; mixing the alpha-CaSO 4 .1/2 H 2 O with water; and implacing the alpha-CaSO 4 .1/2 H 2 O within the interior of the mine for forming protective structures within the mine.
Claim 2
Dependent Claim
136 words
A process for utilizing the residues of a thermal energy power plant washer for forming protective structures within a mine proximate to said power plant comprising the steps of: reacting the sulfur bearing exhaust gases of the power plant with a calcium compound in the washer to form a CaSO 4 compound: disassociating and recrystallizing substantially all of the CaSO 4 compound to form alpha-CaSO 4 .1/2 H 2 O in dry form by heating the CaSO 4 compound with thermal energy obtained from the power plant; conveying the alpha-CaSO 4 .1/2 H 2 O in dry form to the interior of the mine; mixing the alpha-CaSO 4 .1/2 H 2 O with water; and implacing the alpha-CaSO 4 .1/2 H 2 O within the interior of the mine for forming protective structures within the mine.
Claim 3
Dependent Claim
19 words
The process according to claim 1 wherein the disassociation and recrystallization occurs at a temperature of approximately 130° C.
Claim 4
Dependent Claim
18 words
The process according to claim 1 wherein the dry alpha-CaSO 4 .1/2 H 2 O is pneumatically conveyed.
Claim 5
Dependent Claim
34 words
The process according to claim 1 wherein the mixing step is further defined as mixing the alpha-sulfate hemihydrate with an amount of water determined accordance with the desired ultimate strength of the implaced hemihydrate.
Claim 6
Dependent Claim
21 words
The process according to claim 1 wherein the implacing step is further defined as forming mine protecting barricades in the mine.
Claim 7
Dependent Claim
19 words
The process according to claim 1 wherein the implacing step is further defined as back filling mine section structures.
References Cited (Backward Citations)
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Cited
US3410655A
Cited
US3574648A
Cited
US3582376A
Cited
DE2161049A1
Cited
US3786639A
Cited
US3855391A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |