US4412840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pelletizing lignite
Assignee: Individual
•
Filing: 1981-01-16
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Granted: 1983-11-01
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Expires: 2001-01-16
Abstract
Abstract Lignite is formed into high strength pellets having a calorific value of at least 9,500 Btu/lb by blending a sufficient amount of an aqueous base bituminous emulsion with finely-divided raw lignite containing its inherent moisture to form a moistened green mixture containing at least 3 weight % of the bituminous material, based on the total dry weight of the solids, pelletizing the green mixture into discrete green pellets of a predetermined average diameter and drying the green pellets to a predetermined moisture content, preferrably no less than about 5 weight %. Lignite char and mixture of raw lignite and lignite char can be formed into high strength pellets in the same general manner.
Inventors
- 👤 Mehmet A. Goksel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:09
CPC Classifications
C; C10; C10L; C10L5/00; C10L5/02; C10L5/06; C10L5/10; C10L5/14; C10L5/16; C10F; C10F7/00; C10F7/04; C10L5/26; C10L5/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
A method for forming high strength pellets from lignite comprising the steps of: (a) comminuting run of the mine raw lignite into finely divided form without substantial drying; (b) uniformly blending a sufficient amount of an aqueous base bituminous emulsion with said finely-divided raw lignite to form a moistened mixture containing at least 3 weight % of the bituminous materials, based on the total dry weight of the solids in said mixture; (c) pelletizing said moistened mixture in a balling means to form discrete, generally spherical, green pellets and having a moisture content of about 25 to about 45 weight %; and (d) drying said green pellets.
Claim 2
Independent Claim
107 words
A method for forming high strength pellets from lignite comprising the steps of: (a) comminuting run of the mine raw lignite into finely divided form without substantial drying; (b) uniformly blending a sufficient amount of an aqueous base bituminous emulsion with said finely-divided raw lignite to form a moistened mixture containing at least 3 weight % of the bituminous materials, based on the total dry weight of the solids in said mixture; (c) pelletizing said moistened mixture in a balling means to form discrete, generally spherical, green pellets and having a moisture content of about 25 to about 45 weight %; and (d) drying said green pellets.
Claim 3
Dependent Claim
47 words
A method according to claim 1 wherein the amount of said bituminous emulsion added to said mixture is sufficient to incorporate about 5 to about 10 weight % of the bituminous material into said pellets, based on the total dry weight of the solids in said pellets.
Claim 4
Dependent Claim
27 words
A method according to claim 1 wherein said green pellets are dried to a moisture content of no less than about 5 weight % during Step (d).
Claim 5
Dependent Claim
27 words
A method according to Claim 3 wherein said green pellets are dried to a moisture content of about 10 to about 30 weight % during step (d).
Claim 6
Dependent Claim
27 words
A method according to Claim 4 wherein said green pellets are dried to a moisture content of about 20 to about 25 weight % during step (d).
Claim 7
Dependent Claim
14 words
A method according to Claim 1 wherein the luminous material is a petroleum asphalt.
Claim 8
Dependent Claim
25 words
A method according to claim 1 wherein the particle size of at least a major portion of said lignite is finer than about 10 mesh.
Claim 9
Dependent Claim
22 words
A method according to claim 1 wherein step (d) is carried out at a temperature of about 10 to about 350° C.
Claim 10
Dependent Claim
35 words
A method according to Claim 7 wherein a major portion of said raw lignite particles in said mixture is between about 10 mesh and 50 mesh and a minor portion is finer than 50 mesh.
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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) | 1986-10-31 | 1987-05-02 | 1987-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-31 | 1991-05-02 | 1991-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-31 | 1995-05-02 | 1995-11-01 | $7700.00 | Window Closed / Lapsed |