US4479913A
Expired / Lapsed
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Method and composition for a ramming mix in aluminum reduction cells
Assignee: Qo Chemicals Inc
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Filing: 1983-02-18
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Granted: 1984-10-30
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Expires: 2003-02-18
Abstract
Abstract A method and composition for joining adjacent carbon blocks in a high temperature environment including ramming a mix of calcined anthracite, resin, and a monomeric furfuryl alcohol in between the carbon blocks, curing and carbonizing.
Inventors
- 👤 Denis W. Akerberg
- 👤 Carl A. Rude
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:45
CPC Classifications
C; C25; C25C; C25C3/00; C25C3/06; C25C3/08; C04; C04B; C04B35/00; C04B35/515; C04B35/52; C04B35/524
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
152 words
A method for joining adjacent carbon blocks with a high temperature polymerizable ramming mix, wherein the mix is rammed at ambient temperature between the adjacent blocks, comprising the steps of: a. preparing the high temperature polymerizable ramming mix by admixing, at ambient temperature: approximately 80-85 percent calcined anthracite: approximately 10-20 percent of a binder capable of carbonizing to over 40 percent carbon content based on the weight of the binder; approximately 5-10 percent monomeric furfuryl alcohol; and a catalytic amount of a heat activated polymerizing catalyst; b. ramming said ramming mix at ambient temperature between said adjacent carbon blocks; c. allowing the monomeric furfuryl alcohol to penetrate into said adjacent carbon blocks; and d. baking said carbon blocks to cure the binder material, wherein the temperature is slowly raised to a temperature at which the binder material carbonizes; whereby the carbonized binder provides a strong carbon-carbon bond with said adjacent carbon blocks.
Claim 2
Independent Claim
152 words
A method for joining adjacent carbon blocks with a high temperature polymerizable ramming mix, wherein the mix is rammed at ambient temperature between the adjacent blocks, comprising the steps of: a. preparing the high temperature polymerizable ramming mix by admixing, at ambient temperature: approximately 80-85 percent calcined anthracite: approximately 10-20 percent of a binder capable of carbonizing to over 40 percent carbon content based on the weight of the binder; approximately 5-10 percent monomeric furfuryl alcohol; and a catalytic amount of a heat activated polymerizing catalyst; b. ramming said ramming mix at ambient temperature between said adjacent carbon blocks; c. allowing the monomeric furfuryl alcohol to penetrate into said adjacent carbon blocks; and d. baking said carbon blocks to cure the binder material, wherein the temperature is slowly raised to a temperature at which the binder material carbonizes; whereby the carbonized binder provides a strong carbon-carbon bond with said adjacent carbon blocks.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein the binder comprises a resinous material selected from the group consisting of furan resins, phenolic resins, and liquid coal tar.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein the binder comprises a material selected from the group consisting of resorcinol, bisphenol-A, resoles, novolaks and combinations thereof.
Claim 5
Dependent Claim
26 words
The method of claim 1 wherein the catalyst is selected from the group consisting of zinc chloride, maleic anhydride, phthalic anhydride, ferric chloride and ammonium chloride.
Claim 6
Dependent Claim
52 words
The method of claim 1 wherein the ramming mixture consists essentially of: a. approximately 80 percent calcined anthracite; b. 10-15 percent resinous material; c. 7-9 percent monomeric furfuryl alcohol; d. 1-3 percent furfural; and e. 1-2 percent of a 50 percent solution of zinc chloride in a 50 percent solution in ethanol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-30 | 1988-04-30 | 1988-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-30 | 1992-04-30 | 1992-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-30 | 1996-04-30 | 1996-10-30 | $7700.00 | Window Closed / Lapsed |