US3945839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina refractory
Assignee: NL Industries Inc
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Filing: 1974-10-03
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Granted: 1976-03-23
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Expires: 1994-10-03
Abstract
Abstract A new refractory material has been prepared comprising 70 to 96% alumina, 3 to 20% iron chromite ore, and 1 to 10% of a phosphate compound, calculated as P 2 O 5 . The new refractory material is prepared by admixing 70% to 96% alumina, 3% to 20% iron chromite ore, and 1% to 10% of a phosphate compound selected from the group consisting of aluminium phosphate and phosphoric acid, said phosphate compound calculated at P 2 O 5 , and firing the mixture to form the refractory product. This new refractory material has a low porosity, high bulk density and modulus of rupture.
Inventors
- 👤 Edward L. Manigault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:20
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/6306; C04B35/01; C04B35/10; C04B35/101; C04B35/105
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
53 words
A refractory composition comprising from 70% to 96% alumina, from 3% to 20% iron chromite ore, and from 1% to 10% of a compound selected from the group consisting of phosphoric acid and aluminum phosphate, said compound calculated as P 2 O 5 , all of the percentages expressed on a weight basis.
Claim 2
Dependent Claim
53 words
A refractory composition comprising from 70% to 96% alumina, from 3% to 20% iron chromite ore, and from 1% to 10% of a compound selected from the group consisting of phosphoric acid and aluminum phosphate, said compound calculated as P 2 O 5 , all of the percentages expressed on a weight basis.
Claim 3
Dependent Claim
37 words
Composition according to claim 1 in which from 65% to 94% of the alumina present in said composition is of a size from -1/4 inch to -325 mesh, the remaining alumina refractory raw material being -325 mesh.
Claim 4
Dependent Claim
82 words
A process for preparing a refractory composition which comprises admixing 70% to 96% alumina, 3% to 20% iron-chromite ore, and 1% to 10% of a compound selected from the group consisting of phosphoric acid and aluminum phosphate, said compound calculated as P 2 O 5 , all of the percentages expressed on a weight basis, forming said mixture into a ceramic body and firing said body at temperature from 350°C. to 1650°C. from 2 to 8 hours to form said refractory composition.
Claim 5
Dependent Claim
82 words
A process for preparing a refractory composition which comprises admixing 70% to 96% alumina, 3% to 20% iron-chromite ore, and 1% to 10% of a compound selected from the group consisting of phosphoric acid and aluminum phosphate, said compound calculated as P 2 O 5 , all of the percentages expressed on a weight basis, forming said mixture into a ceramic body and firing said body at temperature from 350°C. to 1650°C. from 2 to 8 hours to form said refractory composition.
Claim 6
Dependent Claim
104 words
A process for preparing a refractory composition which comprises admixing 70% to 96% alumina, 3% to 20% iron-chromite ore, and 1% to 10% of a compound selected from the group consisting of phosphoric acid and aluminum phosphate, said compound calculated as P 2 O 5 , all of the percentages expressed on a weight basis, from 65% to 94% of said alumina having a size from -1/4 inch to +325 mesh, the remaining alumina being -325 mesh, forming said mixture into a ceramic body and firing said body at temperature from 350°C. to 1650°C. for 2 to 8 hours to form said refractory composition.
Claim 7
Dependent Claim
104 words
A process for preparing a refractory composition which comprises admixing 70% to 96% alumina, 3% to 20% iron-chromite ore, and 1% to 10% of a compound selected from the group consisting of phosphoric acid and aluminum phosphate, said compound calculated as P 2 O 5 , all of the percentages expressed on a weight basis, from 65% to 94% of said alumina having a size from -1/4 inch to +325 mesh, the remaining alumina being -325 mesh, forming said mixture into a ceramic body and firing said body at temperature from 350°C. to 1650°C. for 2 to 8 hours to form said refractory composition.
Claim 8
Dependent Claim
39 words
Process according to claim 4 in which the +325 mesh alumina is tabular alumina, the remaining -325 mesh alumina containing from 0% to 75% calcined alumina, the remainder of the -325 mesh alumina being present in the tabular form.
Claim 9
Dependent Claim
62 words
A ceramic composition useful as a plastic mix comprising 70% to 96% alumina, 3% to 20% iron-chromite ore, 1% to 4% bentonite, 0% to 12% water and 1% to 10% of a compound selected from the group consisting of phosphoric acid and aluminum phosphate, said compound calculated as P 2 O 5 , all of the percentages expressed on a weight basis.
Claim 10
Dependent Claim
62 words
A ceramic composition useful as a plastic mix comprising 70% to 96% alumina, 3% to 20% iron-chromite ore, 1% to 4% bentonite, 0% to 12% water and 1% to 10% of a compound selected from the group consisting of phosphoric acid and aluminum phosphate, said compound calculated as P 2 O 5 , all of the percentages expressed on a weight basis.
Claim 11
Dependent Claim
49 words
A ramming mix comprising 70% to 96% alumina, 3% to 20% iron-chromite ore, and 1% to 10% of a compound selected from the group consisting of phosphoric acid and aluminum phosphate, said compound calculated as P 2 O 5 , all of the percentages expressed on a weight basis.
Claim 12
Dependent Claim
49 words
A ramming mix comprising 70% to 96% alumina, 3% to 20% iron-chromite ore, and 1% to 10% of a compound selected from the group consisting of phosphoric acid and aluminum phosphate, said compound calculated as P 2 O 5 , all of the percentages expressed on a weight basis.
References Cited (Backward Citations)
US2852401A
Cited
US3669889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |