US4282039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon ramming mix
Assignee: Reynolds Metals Co
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Filing: 1980-06-30
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Granted: 1981-08-04
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Expires: 2000-06-30
Abstract
Abstract A cold ramming mix suitable for ramming of alumina reduction cell cathode seams at ambient temperature comprising: (A) a solid portion comprising: (I) from about 30 to about 60 weight percent of coarse calcined anthracite; (II) from about 50 to about 30 weight percent of anthracite dust; and (III) from about 1 to about 10 weight percent graphite dust; (B) from about 5 to about 15 weight percent based on the weight of the solid portion of a binder pitch; and (C) from about 5 to about 10 weight percent based on the weight of the solid portion, of a heavy petroleum distillate oil having a 95% distillation range of between about 370° and 540° C. A method for producing such a mix comprising blending A and B to provide a homogeneous mixture and subsequently blending in C under conditions which assure that the pitch binder is not dissolved in the oil of C is also described.
Inventors
- 👤 Vaughn L. Bullough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:09
CPC Classifications
C; C08; C08L; C08L95/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
115 words
A cold ramming mix suitable for ramming of alumina reduction cell cathode seams at ambient temperature comprising: (A) a solid portion comprising (I) from about 30 to about 60 weight percent of coarse calcined anthracite; (II) from about 50 to about 30 weight percent of anthracite dust; and (III) from about 1 to about 10 weight percent graphite dust; (B) from about 5 and about 15 weight percent based on the weight of the solid portion of a binder pitch; and (C) from about 5 to about 10 weight percent based on the weight of the solid portion of a heavy petroleum distillate oil having a 95% distillation range between about 370° and 540° C.
Claim 2
Dependent Claim
115 words
A cold ramming mix suitable for ramming of alumina reduction cell cathode seams at ambient temperature comprising: (A) a solid portion comprising (I) from about 30 to about 60 weight percent of coarse calcined anthracite; (II) from about 50 to about 30 weight percent of anthracite dust; and (III) from about 1 to about 10 weight percent graphite dust; (B) from about 5 and about 15 weight percent based on the weight of the solid portion of a binder pitch; and (C) from about 5 to about 10 weight percent based on the weight of the solid portion of a heavy petroleum distillate oil having a 95% distillation range between about 370° and 540° C.
Claim 3
Dependent Claim
18 words
The ramming mix of claim 1 wherein the coarse calcined anthracite comprises number 2 Buckwheat size calcined anthracite.
Claim 4
Dependent Claim
47 words
The ramming mix of claim 1 where the binder pitch is selected from the group consisting of solid petroleum pitch having a softening point of about 120° C. cube in air and solid cold tar pitch with a softening point of about 115° C. cube in air.
Claim 5
Dependent Claim
21 words
The ramming mix of claim 1 wherein the heavy petroleum distillate oil in a heavy distillate fraction from a catalytic cracker.
Claim 6
Dependent Claim
79 words
The ramming mix of claim 1 wherein the heavy petroleum distillate oil is in a distillate fraction from straight run petroleum having a distillation range according to ASTM D 1160 of 5% at 779° F. through 95% at 967° F., a specific gravity API of 9.3, a viscosity of 140° F. of 123 centistokes and at 210° F. of 18.6 centistokes, an aniline point of 86, a flashpoint of 480° F. COC and a pour point of 55° F.
Claim 7
Independent Claim
160 words
A method for preparing a cold ramming mix suitable for ramming of alumina reduction cell cathode seams at ambient temperature comprising the steps of: (A) blending for a period of time sufficient to provide a homogeneous mixture comprising; (I) from about 30 to about 60 weight percent of coarse calcined anthracite; (II) from about 50 to about 30 weight percent of anthracite dust; (III) from about 1 to about 10 weight percent graphite dust; and (IV) from about 5 to about 15 weight percent based on the combined weight of I, II and III of a binder pitch; (B) adding from about 5 to about 10 weight percent based on the combined weight of I, II and III of a petroleum distillate oil having a 95% distillation range between about 370° and 540° C.; and (C) blending the product of step (B) under conditions which provide a homogeneous mixture and the binder pitch is not dissolved in the petroleum distillate.
Claim 8
Independent Claim
160 words
A method for preparing a cold ramming mix suitable for ramming of alumina reduction cell cathode seams at ambient temperature comprising the steps of: (A) blending for a period of time sufficient to provide a homogeneous mixture comprising; (I) from about 30 to about 60 weight percent of coarse calcined anthracite; (II) from about 50 to about 30 weight percent of anthracite dust; (III) from about 1 to about 10 weight percent graphite dust; and (IV) from about 5 to about 15 weight percent based on the combined weight of I, II and III of a binder pitch; (B) adding from about 5 to about 10 weight percent based on the combined weight of I, II and III of a petroleum distillate oil having a 95% distillation range between about 370° and 540° C.; and (C) blending the product of step (B) under conditions which provide a homogeneous mixture and the binder pitch is not dissolved in the petroleum distillate.
Claim 9
Dependent Claim
20 words
The method of claim 6, wherein the blending of step (C) is performed at a temperature below about 80° C.
Claim 10
Dependent Claim
17 words
The method of claim 7 wherein the coarse calcined anthracite comprises number 2 Buckwheat size calcined anthracite.
Claim 11
Dependent Claim
46 words
The method of claim 7 wherein the binder pitch is selected from the group consisting of solid petroleum pitch having a softening point of about 120° C. cube in air and solid cold tar pitch with a softening point of about 115° C. cube in air.
Claim 12
Dependent Claim
20 words
The method of claim 7 wherein the heavy petroleum distillate oil is a heavy distillate fraction from a catalytic cracker.
Claim 13
Dependent Claim
77 words
The method of claim 7 wherein the heavy petroleum distillate oil is a distillate fraction from straight run petroleum having a distillation range according to ASTM D 1160 of 5% at 779° F. through 95% at 967° F., a specific gravity API of 9.3, a viscosity at 140° F. of 123 centistokes and at 210° F. of 18.6 centistokes, an aniline point of 86, a flashpoint of 480° F. COC and a pour point of 55° F.
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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) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |