# US 4,391,917 A · Alumino-silicate refractory brick

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- Number: US 4,391,917 A
- Document ID: US4391917A
- Status: Granted
- Kind: A
- Application number: 06/402,008
- Filed: 1982-07-26
- Granted: 1983-07-05
- Earliest claimed: 1980-10-27
- Assignees: Dresser Industries, Inc.
- Inventors: David J. Michael; Berhl E. Wishon
- Web page: https://patentgrep.com/patent/US4391917A

## CPC

- C04B 35/18: rich in aluminium oxide
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE

## Abstract

Carbonaceous bonded refractory shapes in which the predominant refractory aggregate is andalusite, being characterized by the absence of substantial shrinkage after coking at 2000.degree. F.

## Claims

### Claim 1

Carbonaceous bonded refractory shapes comprising from about 1 to 35%, by weight, carbon and the balance a non-basic refractory aggregate, said refractory aggregate comprising at least about 75%, by weight, andalusite, said refractory shapes being characterized by the absence of substantial shrinkage after coking at 2000.degree. F., and the absence of mullite.

### Claim 2 (depends on 1)

Shapes of claim 1 in which the balance of the non-basic refractory aggregate is aluminum silicates other than andalusite or alumina.

### Claim 3 (depends on 1)

Shapes of claim 1, which contains an amount up to about 30%, by weight, flake graphite.

### Claim 4 (depends on 1)

Shapes of claim 1 which contains at least, about 65% andalusite based on the total weight of the composition.

### Claim 5 (depends on 1)

Shapes of claim 1, characterized by having between about 0.1% and 1% volume expansion after coking at 2000.degree. F.

### Claim 6 (depends on 1)

Shapes of claim 1 which contain an amount up to about 5%, by weight, carbon black.

### Claim 7 (depends on 1)

Shapes of claim 1 which contain an amount less than about 7.5% amorphous graphite.