US4055471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of restricting the formation of dust when feeding coal into coke ovens
Assignee: Bergwerksverband GmbH
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Filing: 1976-01-06
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Granted: 1977-10-25
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Expires: 1996-01-06
Abstract
Abstract A method for inhibiting dust formation while feeding coal into a coking chamber, comprising preheating coal and subsequently contacting the coal with an aqueous solution of 30-70% by weight of waste sulfite liquor in amounts of about 0.5 to 1.0 parts by weight of said solution per 1000 parts by weight of said coal.
Inventors
- 👤 Kurt-Gunther Beck
- 👤 Wolfgang Rohde
- 👤 Diethard Habermehl
- 👤 Werner Siebert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:07
CPC Classifications
C; C10; C10B; C10B57/00; C10B57/08; C10B57/04; C10B57/06; Y; Y02; Y02E; Y02E50/00; Y02E50/30
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
54 words
A method of inhibiting dust formation while feeding coal into a coking chamber, comprising preheating coal, and subsequently contacting said coal with an aqueous solution of 30-70% by weight of waste sulfite liquor in amounts of about 0.5 to 1.0 parts by weight of said solution per 1000 parts by weight of said coal.
Claim 2
Independent Claim
54 words
A method of inhibiting dust formation while feeding coal into a coking chamber, comprising preheating coal, and subsequently contacting said coal with an aqueous solution of 30-70% by weight of waste sulfite liquor in amounts of about 0.5 to 1.0 parts by weight of said solution per 1000 parts by weight of said coal.
Claim 3
Independent Claim
62 words
A method of inhibiting dust formation while feeding coal into a coking chamber, comprising preheating coal to a temperature between 130° and 190° C., and subsequently contacting said coal with an aqueous solution of 30-70% by weight of waste sulfite liquor in amounts of about 0.5 to 1.0 parts by weight of said solution per 1000 parts by weight of said coal.
Claim 4
Independent Claim
62 words
A method of inhibiting dust formation while feeding coal into a coking chamber, comprising preheating coal to a temperature between 130° and 190° C., and subsequently contacting said coal with an aqueous solution of 30-70% by weight of waste sulfite liquor in amounts of about 0.5 to 1.0 parts by weight of said solution per 1000 parts by weight of said coal.
Claim 5
Dependent Claim
61 words
The method of claim 2, wherein said solution comprising 40% by weight of sulfite liquor is added in a quantity of 0.8 grams per kilogram of coal, and subsequently crude tar derived from the coking of the same type of coal and heated to 90° C. is added to the coal in a quantity of 5 grams per kilogram of coal.
Claim 6
Dependent Claim
12 words
The method of claim 2, wherein said solution additionally includes a surfactant.
Claim 7
Dependent Claim
19 words
The method of claim 4, wherein said solution comprises at most about 1 percent by weight of said surfactant.
Claim 8
Independent Claim
91 words
A method of inhibiting dust formation while feeding coal into a coking chamber, comprising preheating coal; forming an emulsion which comprises an aqueous solution of 30-70% by weight of waste sulfite liquor and which amounts to about 0.5 to 1.0 parts by weight of said solution per 1000 parts by weight of said coal, and an amount of tar 10-50 times by weight, the tar being derived from the coking of the same type of coal as is preheated in said preheating step; and subsequently contacting said coal with said emulsion.
Claim 9
Independent Claim
91 words
A method of inhibiting dust formation while feeding coal into a coking chamber, comprising preheating coal; forming an emulsion which comprises an aqueous solution of 30-70% by weight of waste sulfite liquor and which amounts to about 0.5 to 1.0 parts by weight of said solution per 1000 parts by weight of said coal, and an amount of tar 10-50 times by weight, the tar being derived from the coking of the same type of coal as is preheated in said preheating step; and subsequently contacting said coal with said emulsion.
Claim 10
Independent Claim
90 words
A method of inhibiting dust formation while feeding coal into a coking chamber, comprising preheating coal to a temperature of 190° C.; forming an emulsion comprising 10 parts of a solution composed of a surfactant which is a sulfonate of a fat alcohol and which amounts to 0.5% by weight of the solution, and waste sulfite liquor which amounts to 60% by weight of the solution, and 90 parts by weight of crude tar; and subsequently contacting said coal with said emulsion in an amount sufficient to inhibit dust formation.
Claim 11
Independent Claim
90 words
A method of inhibiting dust formation while feeding coal into a coking chamber, comprising preheating coal to a temperature of 190° C.; forming an emulsion comprising 10 parts of a solution composed of a surfactant which is a sulfonate of a fat alcohol and which amounts to 0.5% by weight of the solution, and waste sulfite liquor which amounts to 60% by weight of the solution, and 90 parts by weight of crude tar; and subsequently contacting said coal with said emulsion in an amount sufficient to inhibit dust formation.
Claim 12
Independent Claim
78 words
A method of inhibiting dust formation while feeding coal into a coking chamber, comprising preheating coal; forming an emulsion comprising an aqueous solution of 30-70% by weight of waste sulfite liquor and which amounts to about 0.5 to 1.0 parts by weight of said solution per 1000 parts by weight of said coal, and an amount of tar 10-50 times by weight of tar which is derived from bituminous coal; and subsequently contacting said coal with said emulsion.
Claim 13
Independent Claim
78 words
A method of inhibiting dust formation while feeding coal into a coking chamber, comprising preheating coal; forming an emulsion comprising an aqueous solution of 30-70% by weight of waste sulfite liquor and which amounts to about 0.5 to 1.0 parts by weight of said solution per 1000 parts by weight of said coal, and an amount of tar 10-50 times by weight of tar which is derived from bituminous coal; and subsequently contacting said coal with said emulsion.
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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) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |