# US 5,344,800 A · Plastic refractory compositions having improved flowability

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- Number: US 5,344,800 A
- Document ID: US5344800A
- Status: Granted
- Kind: A
- Application number: 08/075,166
- Filed: 1993-06-10
- Granted: 1994-09-06
- Earliest claimed: 1993-06-10
- Assignees: A.P. Green Industries, Inc.
- Inventors: Cheryl L. Jackson; John Y. Liu
- Web page: https://patentgrep.com/patent/US5344800A

## CPC

- C04B 35/6365: {Cellulose or derivatives thereof}
- C04B 28/34: containing cold phosphate binders
- C04B 35/636: Polysaccharides or derivatives thereof
- C04B 35/66: Monolithic refractories or refractory mortars, including those whether or not containing clay {(making or repairing of linings F27D1/16)}
- C04B 35/71: Ceramic products containing macroscopic reinforcing agents (C04B35/66 takes precedence {; infiltration of a porous ceramic matrix with a material forming a non-ceramic phase C04B41/00, reaction infiltration with Si in order to form SiC C04B35/573, in order to form Si3N4 C04B35/591})
- C04B 2111/00155: {Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite}
- C04B 2235/3217: Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B 2235/3463: Alumino-silicates other than clay, e.g. mullite
- C04B 2235/3826: Silicon carbides
- 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

Improved gunnable plastic refractory compositions consist of a mass of friable clusters of granular material which has a moisture content of from about 4% to about 10% by weight of the total composition and contains from about 0.05% to about 0.5% by weight (added), preferably 0.1% to 0.3%, of a hydrocolloid selected from the class consisting of a polysaccharide ether and xanthan gum and from about 0.05% to about 1.0% by weight (added), preferably 0.15% to about 0.50%, carbon.

## Claims

### Claim 1

A gunnable plastic refractory composition having a workability index of from about 8% to about 30% and comprising from about 45% to 90% by weight alumina, clay, and at least one of aluminum silicate and silicon carbide, containing by weight, from about 0.05% to about 0.5% of a hydrocolloid selected from the group consisting of a polysaccharide ether and xanthan gum and from about 0.05% to about 1.0% carbon.

### Claim 2 (depends on 1)

A composition of claim 1 wherein the hydrocolloid is an ether of a polysaccharide.

### Claim 3 (depends on 2)

A composition of claim 2 wherein the ether of a polysaccharide is methylcellulose.

### Claim 4 (depends on 2)

A composition of claim 2 wherein the content of an ether of a polysacchiride is from about 0.1% to about 0.3% by weight.

### Claim 5 (depends on 1)

A composition of claim 1 wherein the carbon is present as amorphous carbon.

### Claim 6 (depends on 1)

A composition of claim 1 wherein the carbon content is from about 0.15% to about 0.50%, by weight.

### Claim 7 (depends on 4)

A composition of claim 4 wherein the carbon is present as amorphous carbon and the carbon content is from about 0.15% to about 0.50%, by weight

### Claim 8 (depends on 7)

A composition of claim 7 wherein the amorphous carbon has a particle size of -325 mesh.

### Claim 9 (depends on 7)

A composition of claim 7 wherein the alumina content is about 50% by weight.

### Claim 10 (depends on 7)

A composition of claim 7 wherein the alumina content is about 70% by weight.

### Claim 11 (depends on 7)

A composition of claim 7 wherein the alumina content is about 83% by weight.

### Claim 12 (depends on 1)

A composition of claim 1 further comprising one or more phosphorous compounds selected from phosphoric acid and acid phosphates.

### Claim 13 (depends on 7)

A composition of claim 7 further comprising contains one or more phosphorous compounds selected from phosphoric acid and acid phosphates.

### Claim 14 (depends on 1)

A composition of claim 1 further containing boric acid wherein the alumina is comprised of bauxite and calcined alumina.

### Claim 15 (depends on 14)

A composition of claim 14 containing polypropylene fibers.

### Claim 16 (depends on 14, 15)

A composition of claim 14 or 15 containing one one more phosphorous compounds selected from the group consisting of phosphoric acid and acid phosphates.

### Claim 17 (depends on 14)

A composition of claim 14 wherein the alumina content is about 70% by weight.

### Claim 18 (depends on 15)

A composition of claim 15 wherein the alumina content is about 70% by weight.