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US3948670A
Expired / Lapsed
US
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Alumina-chrome refractory
Assignee: NL Industries Inc
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Filing: 1974-10-24
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Granted: 1976-04-06
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Expires: 1994-10-24
Abstract
Abstract An improved alumina-chrome refractory composition having increased strength at both ambient and high temperatures has been prepared comprising the following ingredients: Tabular Alumina 70-96% Calcined Alumina -325 mesh 0-10% Milled Zircon -325 mesh 1-10% Chromic Oxide Refractory Grains Ground to -10 mesh with at Least 70% +200 mesh 3-10% Bentonite 0-4% Water 0-10% Phosphate Compound 0-18%
Inventors
- 👤 Edward L. Manigault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:14
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/101; C04B35/105; C04B35/106
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
82 words
A refractory composition comprising from 70% to 96% tabular alumina, from 0% to 10% calcined alumina, from 1% to 10% milled zircon, from 3% to 10% chromic oxide refractory grains, from 0% to 18% of a phosphorus compound, from 0% to 4% bentonite and from 0% to 10% water, in which the particle size of the chromic oxide refractory grains is -10 mesh with at least 70% of the particles being +200 mesh, all of the percentages expressed on a weight basis.
Claim 2
Dependent Claim
82 words
A refractory composition comprising from 70% to 96% tabular alumina, from 0% to 10% calcined alumina, from 1% to 10% milled zircon, from 3% to 10% chromic oxide refractory grains, from 0% to 18% of a phosphorus compound, from 0% to 4% bentonite and from 0% to 10% water, in which the particle size of the chromic oxide refractory grains is -10 mesh with at least 70% of the particles being +200 mesh, all of the percentages expressed on a weight basis.
Claim 3
Dependent Claim
44 words
Composition according to claim 1 in which the tabular alumina is present in size from -1/4 in. through -325 mesh, wherein from 65% to 94% of the alumina is from -1/4 in. to +325 mesh, the remainder of the tabular alumina being -325 mesh.
Claim 4
Dependent Claim
26 words
Composition according to claim 1 in which from 1/4 to all of the -325 mesh alumina is present as tabular alumina, the remainder being calcined alumina.
Claim 5
Dependent Claim
22 words
Composition according to claim 1 in which the size of the particles of the calcined alumina and the zircon are -325 mesh.
Claim 6
Dependent Claim
23 words
Composition according to claim 1 in which the phosphorus compound employed is selected from the group consisting of phosphoric acid and aluminum phosphate.
Claim 7
Dependent Claim
64 words
A refractory composition comprising from 70% to 96% tabular alumina, from 0% to 10% calcined alumina, from 1% to 10% milled zircon and from 3% to 10% chromic oxide refractory grains, in which the particle size of the chromic oxide refractory grains is -10 mesh with at least 70% of the particles being +200 mesh, all of the percentages expressed on a weight basis.
Claim 8
Dependent Claim
64 words
A refractory composition comprising from 70% to 96% tabular alumina, from 0% to 10% calcined alumina, from 1% to 10% milled zircon and from 3% to 10% chromic oxide refractory grains, in which the particle size of the chromic oxide refractory grains is -10 mesh with at least 70% of the particles being +200 mesh, all of the percentages expressed on a weight basis.
Claim 9
Dependent Claim
82 words
Process for producing a refractory composition which comprises admixing tabular alumina in amount from 70- 96%, calcined alumina in amount from 0% to 10%, milled zircon in amount from 1% to 10%, chromic oxide refractory grains ground to -10 mesh with at least 70% +200 mesh in amount from 3-10%, the percentages expressed on a weight basis, forming the mixture and firing the formed mixture at a temperature from 1400° to 1750°C. for 2 to 8 hours to form the refractory composition.
Claim 10
Dependent Claim
82 words
Process for producing a refractory composition which comprises admixing tabular alumina in amount from 70- 96%, calcined alumina in amount from 0% to 10%, milled zircon in amount from 1% to 10%, chromic oxide refractory grains ground to -10 mesh with at least 70% +200 mesh in amount from 3-10%, the percentages expressed on a weight basis, forming the mixture and firing the formed mixture at a temperature from 1400° to 1750°C. for 2 to 8 hours to form the refractory composition.
Claim 11
Dependent Claim
91 words
Process for producing a refractory composition which comprises admixing tabular alumina in amount from 70- 96%, calcined alumina in amount from 0% to 10%, milled zircon in amount from 1% to 10%, chromic oxide refractory grains (ground to -10 mesh with at least 70% +200 mesh) in amount from 3- 10%, phosphorus compound in amount from 1% to 18%, the percentages expressed on a weight basis, forming the mixture and firing the formed mixture at a temperature from 350° to 1750°C. for 2 to 8 hours to form the refractory composition.
Claim 12
Dependent Claim
91 words
Process for producing a refractory composition which comprises admixing tabular alumina in amount from 70- 96%, calcined alumina in amount from 0% to 10%, milled zircon in amount from 1% to 10%, chromic oxide refractory grains (ground to -10 mesh with at least 70% +200 mesh) in amount from 3- 10%, phosphorus compound in amount from 1% to 18%, the percentages expressed on a weight basis, forming the mixture and firing the formed mixture at a temperature from 350° to 1750°C. for 2 to 8 hours to form the refractory composition.
Claim 13
Dependent Claim
74 words
Process for producing a plastic mixture which comprises admixing tabular alumina in amount from 70- 96%, calcined alumina in amount from 0% to 10%, milled zircon in amount from 1% to 10%, chromic oxide refractory grains (ground to -10 mesh with at least 70% +200 mesh) in amount from 3- 10%, phosphorus compound in amount from 1% to 18% and bentonite in amount from 1% to 4%, the percentages expressed on a weight basis.
Claim 14
Dependent Claim
74 words
Process for producing a plastic mixture which comprises admixing tabular alumina in amount from 70- 96%, calcined alumina in amount from 0% to 10%, milled zircon in amount from 1% to 10%, chromic oxide refractory grains (ground to -10 mesh with at least 70% +200 mesh) in amount from 3- 10%, phosphorus compound in amount from 1% to 18% and bentonite in amount from 1% to 4%, the percentages expressed on a weight basis.
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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |