# US 4,400,335 A · Process for repairing refractory linings

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,400,335 A
- Document ID: US4400335A
- Status: Granted
- Kind: A
- Application number: 06/331,006
- Filed: 1981-12-15
- Granted: 1983-08-23
- Earliest claimed: 1981-12-15
- Assignees: Höganäs AB
- Inventors: Lennart P. Ivarsson; Ingvar G. A. Blom
- Web page: https://patentgrep.com/patent/US4400335A

## CPC

- C04B 38/0675: {Vegetable refuse; Cellulosic materials, e.g. wood chips, cork, peat, paper}
- F27D 1/1642: {using a gunning apparatus}
- 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
- F27D: DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE

## Abstract

The invention relates to a process for repairing hot refractory linings by applying a refractory composition by spraying on to the part of the lining to be repaired. The invention resides in the improvement comprising applying a composition containing an effective amount of combustible elongated channel-forming elements substantially evenly distributed throughout the composition.

## Claims

### Claim 1

In a process for repairing hot refractory linings by applying a refractory composition by spraying onto the site to be repaired, the improvement comprising applying a composition containing combustible elongated channel-forming elements substantially evenly distributed throughout the composition
wherein the hot refractory has a temperature greater than that at which the channel-forming elements are combustible.

### Claim 2 (depends on 1)

A process according to claim 1, wherein said elements constitute about 0.05-0.5% by weight of the composition.

### Claim 3 (depends on 1)

A process according to claim 1, wherein the composition is based on a refractory mass selected from the group comprising acid, neutral and basic masses.

### Claim 4 (depends on 1)

A process according to claim 1, wherein said elements consist of palm tree fibres.

### Claim 5 (depends on 1)

A process according to claim 1, wherein the composition is applied locally to fill out local cavities.

### Claim 6 (depends on 1)

A process according to claim 1, wherein the composition is applied onto the whole worn out surface of the lining.

### Claim 7 (depends on 1)

A process according to claim 1, wherein said elements are selected from the group comprising straws and stalks of cereals, rice roots, palm tree fibres, pine needles, plastic fibres and tubes.

### Claim 8 (depends on 7)

A process according to claim 7, wherein the length of said elements is within the range about 5 mms to about 10 cms.

### Claim 9

In a process for repairing refractory linings having a temperature of 1400.degree. C. by applying a refractory composition by spraying onto the site to be repaired, the improvement comprising applying a composition containing combustible, elongated channel-forming elements substantially evenly distributed throughout the composition, said composition being based on a refractory mass of Al.sub.2 O.sub.3 and having minor amounts of binders, said elements being palm tree fibers having a length of 1 to 3 centimeters and constituting 0.2% by weight of the composition.