US4432799A
Expired / Lapsed
US
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Refractory compositions and method
Assignee: Individual
•
Filing: 1982-03-08
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Granted: 1984-02-21
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Expires: 2002-03-08
Abstract
Abstract A basic refractory composition includes a magnesium oxide source, aluminum phosphate and an insulating material selected from the group consisting of perlite, vermiculite, diatomaceous earth, and mixtures thereof in an amount of 5.60% based on the total weight of the composition. The composition provides excellent temperature resistance while retaining unexpected strength for a magnesium oxide based chemically bound refractory material having a substantial portion of insulating material.
Inventors
- 👤 Paul V. Salazar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:27
CPC Classifications
C; C04; C04B; C04B12/00; C04B12/02; C04B12/022; C04B28/00; C04B28/34; C04B28/346; C04B2111/00; C04B2111/00034; C04B2111/00086
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
52 words
A basic refractory composition which, when wetted, forms a magnesium aluminum phosphate bond comprising: A magnesium oxide source: 20-94%; Aluminum phosphate: 5-70%; and an insulating material selected from the group consisting of perlite, vermiculite, diatomaceous earth, and mixtures thereof in an amount of 5-60% based on the total weight of the composition.
Claim 2
Dependent Claim
52 words
A basic refractory composition which, when wetted, forms a magnesium aluminum phosphate bond comprising: A magnesium oxide source: 20-94%; Aluminum phosphate: 5-70%; and an insulating material selected from the group consisting of perlite, vermiculite, diatomaceous earth, and mixtures thereof in an amount of 5-60% based on the total weight of the composition.
Claim 3
Dependent Claim
26 words
The composition of claim 1 wherein said magnesium oxide source is selected from the group consisting of magnesium oxide, magnesite, dolomite, chrome magnesite, and mixtures thereof.
Claim 4
Independent Claim
88 words
A method of manufacturing a basic refractory composition comprising: mixing dried aluminum phosphate, a source of dried magnesium oxide, a source of aluminum silicate and an insulating material selected from the group consisting of perlite, vermiculite, diatomaceous earth and mixtures thereof in an amount of 5-60% based on the total weight of the composition to form a dry refractory composition; and then adding water to said dried refractory composition to initiate a reaction between said aluminum phosphate and said magnesium oxide to form a magnesium aluminum phosphate bond.
Claim 5
Independent Claim
88 words
A method of manufacturing a basic refractory composition comprising: mixing dried aluminum phosphate, a source of dried magnesium oxide, a source of aluminum silicate and an insulating material selected from the group consisting of perlite, vermiculite, diatomaceous earth and mixtures thereof in an amount of 5-60% based on the total weight of the composition to form a dry refractory composition; and then adding water to said dried refractory composition to initiate a reaction between said aluminum phosphate and said magnesium oxide to form a magnesium aluminum phosphate bond.
Claim 6
Dependent Claim
48 words
The method of claim 3 further including mixing with said aluminum phosphate and said magnesium oxide an insulating material selected from the group consisting of perlite, vermiculite and diatomaceous earth in an amount of 5-40% based on the total weight of aluminum phosphate, magnesium oxide and insulating material.
Claim 7
Dependent Claim
26 words
The method of claim 3 wherein said magnesium oxide source is selected from the group consisting of magnesium oxide, magnesite, dolomite, chrome magnesite, and mixtures thereof.
Claim 8
Dependent Claim
34 words
The method of claim 3 further including reacting phosphoric acid with an aluminum silicate to form an aluminum phosphate reaction product, and drying said aluminum phosphate reaction product to provide said dried aluminum phosphate.
References Cited (Backward Citations)
US3923534A
Cited
US4235636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |